Mercurial > cpython-lru_cache-weakref
annotate Lib/decimal.py @ 54294:dba767bc3155 legacy-trunk
remove mention of old ctypes version
| author | Benjamin Peterson <benjamin@python.org> |
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| date | Sat, 23 May 2009 20:59:09 +0000 |
| parents | 1c060d5c47cf |
| children | 7c23f0bcca85 |
| rev | line source |
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1 # Copyright (c) 2004 Python Software Foundation. |
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2 # All rights reserved. |
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3 |
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4 # Written by Eric Price <eprice at tjhsst.edu> |
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5 # and Facundo Batista <facundo at taniquetil.com.ar> |
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6 # and Raymond Hettinger <python at rcn.com> |
| 32456 | 7 # and Aahz <aahz at pobox.com> |
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8 # and Tim Peters |
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9 |
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10 # This module is currently Py2.3 compatible and should be kept that way |
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11 # unless a major compelling advantage arises. IOW, 2.3 compatibility is |
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12 # strongly preferred, but not guaranteed. |
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13 |
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14 # Also, this module should be kept in sync with the latest updates of |
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15 # the IBM specification as it evolves. Those updates will be treated |
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16 # as bug fixes (deviation from the spec is a compatibility, usability |
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17 # bug) and will be backported. At this point the spec is stabilizing |
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18 # and the updates are becoming fewer, smaller, and less significant. |
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19 |
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20 """ |
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21 This is a Py2.3 implementation of decimal floating point arithmetic based on |
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22 the General Decimal Arithmetic Specification: |
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23 |
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24 www2.hursley.ibm.com/decimal/decarith.html |
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25 |
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26 and IEEE standard 854-1987: |
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27 |
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28 www.cs.berkeley.edu/~ejr/projects/754/private/drafts/854-1987/dir.html |
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29 |
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30 Decimal floating point has finite precision with arbitrarily large bounds. |
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31 |
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32 The purpose of this module is to support arithmetic using familiar |
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33 "schoolhouse" rules and to avoid some of the tricky representation |
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34 issues associated with binary floating point. The package is especially |
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35 useful for financial applications or for contexts where users have |
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36 expectations that are at odds with binary floating point (for instance, |
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37 in binary floating point, 1.00 % 0.1 gives 0.09999999999999995 instead |
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38 of the expected Decimal('0.00') returned by decimal floating point). |
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39 |
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40 Here are some examples of using the decimal module: |
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41 |
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42 >>> from decimal import * |
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43 >>> setcontext(ExtendedContext) |
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44 >>> Decimal(0) |
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45 Decimal('0') |
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46 >>> Decimal('1') |
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47 Decimal('1') |
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48 >>> Decimal('-.0123') |
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49 Decimal('-0.0123') |
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50 >>> Decimal(123456) |
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51 Decimal('123456') |
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52 >>> Decimal('123.45e12345678901234567890') |
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53 Decimal('1.2345E+12345678901234567892') |
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54 >>> Decimal('1.33') + Decimal('1.27') |
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55 Decimal('2.60') |
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56 >>> Decimal('12.34') + Decimal('3.87') - Decimal('18.41') |
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57 Decimal('-2.20') |
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58 >>> dig = Decimal(1) |
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59 >>> print dig / Decimal(3) |
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60 0.333333333 |
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61 >>> getcontext().prec = 18 |
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62 >>> print dig / Decimal(3) |
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63 0.333333333333333333 |
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64 >>> print dig.sqrt() |
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65 1 |
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66 >>> print Decimal(3).sqrt() |
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67 1.73205080756887729 |
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68 >>> print Decimal(3) ** 123 |
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69 4.85192780976896427E+58 |
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70 >>> inf = Decimal(1) / Decimal(0) |
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71 >>> print inf |
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72 Infinity |
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73 >>> neginf = Decimal(-1) / Decimal(0) |
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74 >>> print neginf |
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75 -Infinity |
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76 >>> print neginf + inf |
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77 NaN |
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78 >>> print neginf * inf |
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79 -Infinity |
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80 >>> print dig / 0 |
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81 Infinity |
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82 >>> getcontext().traps[DivisionByZero] = 1 |
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83 >>> print dig / 0 |
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84 Traceback (most recent call last): |
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85 ... |
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86 ... |
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87 ... |
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88 DivisionByZero: x / 0 |
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89 >>> c = Context() |
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90 >>> c.traps[InvalidOperation] = 0 |
| 32560 | 91 >>> print c.flags[InvalidOperation] |
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92 0 |
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93 >>> c.divide(Decimal(0), Decimal(0)) |
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94 Decimal('NaN') |
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95 >>> c.traps[InvalidOperation] = 1 |
| 32560 | 96 >>> print c.flags[InvalidOperation] |
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97 1 |
| 32560 | 98 >>> c.flags[InvalidOperation] = 0 |
| 99 >>> print c.flags[InvalidOperation] | |
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100 0 |
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101 >>> print c.divide(Decimal(0), Decimal(0)) |
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102 Traceback (most recent call last): |
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103 ... |
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104 ... |
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105 ... |
| 32560 | 106 InvalidOperation: 0 / 0 |
| 107 >>> print c.flags[InvalidOperation] | |
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108 1 |
| 32560 | 109 >>> c.flags[InvalidOperation] = 0 |
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110 >>> c.traps[InvalidOperation] = 0 |
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111 >>> print c.divide(Decimal(0), Decimal(0)) |
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112 NaN |
| 32560 | 113 >>> print c.flags[InvalidOperation] |
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114 1 |
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115 >>> |
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116 """ |
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117 |
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118 __all__ = [ |
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119 # Two major classes |
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120 'Decimal', 'Context', |
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121 |
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122 # Contexts |
| 32482 | 123 'DefaultContext', 'BasicContext', 'ExtendedContext', |
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124 |
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125 # Exceptions |
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126 'DecimalException', 'Clamped', 'InvalidOperation', 'DivisionByZero', |
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127 'Inexact', 'Rounded', 'Subnormal', 'Overflow', 'Underflow', |
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128 |
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129 # Constants for use in setting up contexts |
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130 'ROUND_DOWN', 'ROUND_HALF_UP', 'ROUND_HALF_EVEN', 'ROUND_CEILING', |
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131 'ROUND_FLOOR', 'ROUND_UP', 'ROUND_HALF_DOWN', 'ROUND_05UP', |
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132 |
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133 # Functions for manipulating contexts |
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134 'setcontext', 'getcontext', 'localcontext' |
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135 ] |
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136 |
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137 __version__ = '1.70' # Highest version of the spec this complies with |
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138 |
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139 import copy as _copy |
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140 import math as _math |
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141 import numbers as _numbers |
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142 |
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143 try: |
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144 from collections import namedtuple as _namedtuple |
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145 DecimalTuple = _namedtuple('DecimalTuple', 'sign digits exponent') |
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146 except ImportError: |
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147 DecimalTuple = lambda *args: args |
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148 |
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149 # Rounding |
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150 ROUND_DOWN = 'ROUND_DOWN' |
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151 ROUND_HALF_UP = 'ROUND_HALF_UP' |
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152 ROUND_HALF_EVEN = 'ROUND_HALF_EVEN' |
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153 ROUND_CEILING = 'ROUND_CEILING' |
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154 ROUND_FLOOR = 'ROUND_FLOOR' |
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155 ROUND_UP = 'ROUND_UP' |
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156 ROUND_HALF_DOWN = 'ROUND_HALF_DOWN' |
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157 ROUND_05UP = 'ROUND_05UP' |
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158 |
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159 # Errors |
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160 |
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161 class DecimalException(ArithmeticError): |
| 32560 | 162 """Base exception class. |
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163 |
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164 Used exceptions derive from this. |
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165 If an exception derives from another exception besides this (such as |
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166 Underflow (Inexact, Rounded, Subnormal) that indicates that it is only |
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167 called if the others are present. This isn't actually used for |
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168 anything, though. |
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169 |
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170 handle -- Called when context._raise_error is called and the |
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171 trap_enabler is set. First argument is self, second is the |
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172 context. More arguments can be given, those being after |
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173 the explanation in _raise_error (For example, |
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174 context._raise_error(NewError, '(-x)!', self._sign) would |
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175 call NewError().handle(context, self._sign).) |
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176 |
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177 To define a new exception, it should be sufficient to have it derive |
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178 from DecimalException. |
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179 """ |
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180 def handle(self, context, *args): |
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181 pass |
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182 |
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183 |
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184 class Clamped(DecimalException): |
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185 """Exponent of a 0 changed to fit bounds. |
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186 |
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187 This occurs and signals clamped if the exponent of a result has been |
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188 altered in order to fit the constraints of a specific concrete |
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189 representation. This may occur when the exponent of a zero result would |
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190 be outside the bounds of a representation, or when a large normal |
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191 number would have an encoded exponent that cannot be represented. In |
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192 this latter case, the exponent is reduced to fit and the corresponding |
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193 number of zero digits are appended to the coefficient ("fold-down"). |
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194 """ |
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195 |
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196 class InvalidOperation(DecimalException): |
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197 """An invalid operation was performed. |
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198 |
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199 Various bad things cause this: |
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200 |
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201 Something creates a signaling NaN |
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202 -INF + INF |
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203 0 * (+-)INF |
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204 (+-)INF / (+-)INF |
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205 x % 0 |
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206 (+-)INF % x |
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207 x._rescale( non-integer ) |
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208 sqrt(-x) , x > 0 |
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209 0 ** 0 |
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210 x ** (non-integer) |
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211 x ** (+-)INF |
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212 An operand is invalid |
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213 |
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214 The result of the operation after these is a quiet positive NaN, |
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215 except when the cause is a signaling NaN, in which case the result is |
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216 also a quiet NaN, but with the original sign, and an optional |
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217 diagnostic information. |
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218 """ |
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219 def handle(self, context, *args): |
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220 if args: |
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221 ans = _dec_from_triple(args[0]._sign, args[0]._int, 'n', True) |
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222 return ans._fix_nan(context) |
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223 return _NaN |
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224 |
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225 class ConversionSyntax(InvalidOperation): |
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226 """Trying to convert badly formed string. |
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227 |
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228 This occurs and signals invalid-operation if an string is being |
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229 converted to a number and it does not conform to the numeric string |
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230 syntax. The result is [0,qNaN]. |
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231 """ |
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232 def handle(self, context, *args): |
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233 return _NaN |
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234 |
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235 class DivisionByZero(DecimalException, ZeroDivisionError): |
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236 """Division by 0. |
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237 |
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238 This occurs and signals division-by-zero if division of a finite number |
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239 by zero was attempted (during a divide-integer or divide operation, or a |
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240 power operation with negative right-hand operand), and the dividend was |
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241 not zero. |
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242 |
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243 The result of the operation is [sign,inf], where sign is the exclusive |
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244 or of the signs of the operands for divide, or is 1 for an odd power of |
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245 -0, for power. |
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246 """ |
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247 |
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248 def handle(self, context, sign, *args): |
| 50497 | 249 return _SignedInfinity[sign] |
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250 |
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251 class DivisionImpossible(InvalidOperation): |
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252 """Cannot perform the division adequately. |
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253 |
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254 This occurs and signals invalid-operation if the integer result of a |
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255 divide-integer or remainder operation had too many digits (would be |
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256 longer than precision). The result is [0,qNaN]. |
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257 """ |
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258 |
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259 def handle(self, context, *args): |
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260 return _NaN |
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261 |
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262 class DivisionUndefined(InvalidOperation, ZeroDivisionError): |
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263 """Undefined result of division. |
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264 |
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265 This occurs and signals invalid-operation if division by zero was |
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266 attempted (during a divide-integer, divide, or remainder operation), and |
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267 the dividend is also zero. The result is [0,qNaN]. |
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268 """ |
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269 |
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270 def handle(self, context, *args): |
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271 return _NaN |
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272 |
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273 class Inexact(DecimalException): |
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274 """Had to round, losing information. |
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275 |
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276 This occurs and signals inexact whenever the result of an operation is |
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277 not exact (that is, it needed to be rounded and any discarded digits |
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278 were non-zero), or if an overflow or underflow condition occurs. The |
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279 result in all cases is unchanged. |
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280 |
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281 The inexact signal may be tested (or trapped) to determine if a given |
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282 operation (or sequence of operations) was inexact. |
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283 """ |
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284 |
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285 class InvalidContext(InvalidOperation): |
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286 """Invalid context. Unknown rounding, for example. |
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287 |
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288 This occurs and signals invalid-operation if an invalid context was |
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289 detected during an operation. This can occur if contexts are not checked |
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290 on creation and either the precision exceeds the capability of the |
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291 underlying concrete representation or an unknown or unsupported rounding |
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292 was specified. These aspects of the context need only be checked when |
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293 the values are required to be used. The result is [0,qNaN]. |
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294 """ |
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295 |
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296 def handle(self, context, *args): |
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297 return _NaN |
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298 |
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299 class Rounded(DecimalException): |
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300 """Number got rounded (not necessarily changed during rounding). |
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301 |
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302 This occurs and signals rounded whenever the result of an operation is |
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303 rounded (that is, some zero or non-zero digits were discarded from the |
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304 coefficient), or if an overflow or underflow condition occurs. The |
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305 result in all cases is unchanged. |
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306 |
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307 The rounded signal may be tested (or trapped) to determine if a given |
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308 operation (or sequence of operations) caused a loss of precision. |
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309 """ |
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310 |
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311 class Subnormal(DecimalException): |
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312 """Exponent < Emin before rounding. |
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313 |
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314 This occurs and signals subnormal whenever the result of a conversion or |
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315 operation is subnormal (that is, its adjusted exponent is less than |
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316 Emin, before any rounding). The result in all cases is unchanged. |
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317 |
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318 The subnormal signal may be tested (or trapped) to determine if a given |
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319 or operation (or sequence of operations) yielded a subnormal result. |
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320 """ |
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321 |
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322 class Overflow(Inexact, Rounded): |
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323 """Numerical overflow. |
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324 |
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325 This occurs and signals overflow if the adjusted exponent of a result |
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326 (from a conversion or from an operation that is not an attempt to divide |
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327 by zero), after rounding, would be greater than the largest value that |
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328 can be handled by the implementation (the value Emax). |
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329 |
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330 The result depends on the rounding mode: |
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331 |
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332 For round-half-up and round-half-even (and for round-half-down and |
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333 round-up, if implemented), the result of the operation is [sign,inf], |
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334 where sign is the sign of the intermediate result. For round-down, the |
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335 result is the largest finite number that can be represented in the |
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336 current precision, with the sign of the intermediate result. For |
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337 round-ceiling, the result is the same as for round-down if the sign of |
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338 the intermediate result is 1, or is [0,inf] otherwise. For round-floor, |
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339 the result is the same as for round-down if the sign of the intermediate |
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340 result is 0, or is [1,inf] otherwise. In all cases, Inexact and Rounded |
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341 will also be raised. |
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342 """ |
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343 |
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344 def handle(self, context, sign, *args): |
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345 if context.rounding in (ROUND_HALF_UP, ROUND_HALF_EVEN, |
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346 ROUND_HALF_DOWN, ROUND_UP): |
| 50497 | 347 return _SignedInfinity[sign] |
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348 if sign == 0: |
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349 if context.rounding == ROUND_CEILING: |
| 50497 | 350 return _SignedInfinity[sign] |
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351 return _dec_from_triple(sign, '9'*context.prec, |
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352 context.Emax-context.prec+1) |
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353 if sign == 1: |
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354 if context.rounding == ROUND_FLOOR: |
| 50497 | 355 return _SignedInfinity[sign] |
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356 return _dec_from_triple(sign, '9'*context.prec, |
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357 context.Emax-context.prec+1) |
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358 |
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359 |
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360 class Underflow(Inexact, Rounded, Subnormal): |
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361 """Numerical underflow with result rounded to 0. |
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362 |
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363 This occurs and signals underflow if a result is inexact and the |
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364 adjusted exponent of the result would be smaller (more negative) than |
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365 the smallest value that can be handled by the implementation (the value |
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366 Emin). That is, the result is both inexact and subnormal. |
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367 |
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368 The result after an underflow will be a subnormal number rounded, if |
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369 necessary, so that its exponent is not less than Etiny. This may result |
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370 in 0 with the sign of the intermediate result and an exponent of Etiny. |
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371 |
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372 In all cases, Inexact, Rounded, and Subnormal will also be raised. |
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373 """ |
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374 |
| 32560 | 375 # List of public traps and flags |
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376 _signals = [Clamped, DivisionByZero, Inexact, Overflow, Rounded, |
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377 Underflow, InvalidOperation, Subnormal] |
| 32560 | 378 |
| 379 # Map conditions (per the spec) to signals | |
| 380 _condition_map = {ConversionSyntax:InvalidOperation, | |
| 381 DivisionImpossible:InvalidOperation, | |
| 382 DivisionUndefined:InvalidOperation, | |
| 383 InvalidContext:InvalidOperation} | |
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384 |
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385 ##### Context Functions ################################################## |
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386 |
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387 # The getcontext() and setcontext() function manage access to a thread-local |
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388 # current context. Py2.4 offers direct support for thread locals. If that |
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389 # is not available, use threading.currentThread() which is slower but will |
| 34184 | 390 # work for older Pythons. If threads are not part of the build, create a |
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391 # mock threading object with threading.local() returning the module namespace. |
| 34184 | 392 |
| 393 try: | |
| 394 import threading | |
| 395 except ImportError: | |
| 396 # Python was compiled without threads; create a mock object instead | |
| 397 import sys | |
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398 class MockThreading(object): |
| 34184 | 399 def local(self, sys=sys): |
| 400 return sys.modules[__name__] | |
| 401 threading = MockThreading() | |
| 402 del sys, MockThreading | |
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403 |
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404 try: |
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405 threading.local |
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406 |
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407 except AttributeError: |
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408 |
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409 # To fix reloading, force it to create a new context |
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410 # Old contexts have different exceptions in their dicts, making problems. |
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411 if hasattr(threading.currentThread(), '__decimal_context__'): |
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412 del threading.currentThread().__decimal_context__ |
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413 |
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414 def setcontext(context): |
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415 """Set this thread's context to context.""" |
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416 if context in (DefaultContext, BasicContext, ExtendedContext): |
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417 context = context.copy() |
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418 context.clear_flags() |
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419 threading.currentThread().__decimal_context__ = context |
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420 |
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421 def getcontext(): |
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422 """Returns this thread's context. |
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423 |
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424 If this thread does not yet have a context, returns |
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425 a new context and sets this thread's context. |
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426 New contexts are copies of DefaultContext. |
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427 """ |
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428 try: |
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429 return threading.currentThread().__decimal_context__ |
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430 except AttributeError: |
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431 context = Context() |
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432 threading.currentThread().__decimal_context__ = context |
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433 return context |
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434 |
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435 else: |
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436 |
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437 local = threading.local() |
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438 if hasattr(local, '__decimal_context__'): |
|
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439 del local.__decimal_context__ |
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440 |
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441 def getcontext(_local=local): |
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442 """Returns this thread's context. |
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443 |
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444 If this thread does not yet have a context, returns |
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445 a new context and sets this thread's context. |
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446 New contexts are copies of DefaultContext. |
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447 """ |
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448 try: |
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449 return _local.__decimal_context__ |
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450 except AttributeError: |
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451 context = Context() |
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452 _local.__decimal_context__ = context |
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453 return context |
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454 |
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455 def setcontext(context, _local=local): |
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456 """Set this thread's context to context.""" |
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457 if context in (DefaultContext, BasicContext, ExtendedContext): |
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458 context = context.copy() |
|
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459 context.clear_flags() |
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460 _local.__decimal_context__ = context |
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461 |
|
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462 del threading, local # Don't contaminate the namespace |
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463 |
|
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Fix the wrongheaded implementation of context management in the decimal module and add unit tests. (python-dev discussion is ongoing regarding what we do about Python 2.5)
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464 def localcontext(ctx=None): |
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465 """Return a context manager for a copy of the supplied context |
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466 |
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467 Uses a copy of the current context if no context is specified |
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468 The returned context manager creates a local decimal context |
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469 in a with statement: |
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470 def sin(x): |
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471 with localcontext() as ctx: |
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472 ctx.prec += 2 |
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473 # Rest of sin calculation algorithm |
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474 # uses a precision 2 greater than normal |
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475 return +s # Convert result to normal precision |
|
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476 |
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477 def sin(x): |
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478 with localcontext(ExtendedContext): |
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479 # Rest of sin calculation algorithm |
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480 # uses the Extended Context from the |
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481 # General Decimal Arithmetic Specification |
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482 return +s # Convert result to normal context |
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483 |
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484 >>> setcontext(DefaultContext) |
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485 >>> print getcontext().prec |
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486 28 |
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487 >>> with localcontext(): |
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488 ... ctx = getcontext() |
| 40770 | 489 ... ctx.prec += 2 |
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490 ... print ctx.prec |
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491 ... |
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492 30 |
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493 >>> with localcontext(ExtendedContext): |
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494 ... print getcontext().prec |
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495 ... |
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496 9 |
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497 >>> print getcontext().prec |
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498 28 |
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499 """ |
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500 if ctx is None: ctx = getcontext() |
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501 return _ContextManager(ctx) |
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502 |
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503 |
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504 ##### Decimal class ####################################################### |
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505 |
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506 class Decimal(object): |
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507 """Floating point class for decimal arithmetic.""" |
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508 |
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509 __slots__ = ('_exp','_int','_sign', '_is_special') |
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510 # Generally, the value of the Decimal instance is given by |
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511 # (-1)**_sign * _int * 10**_exp |
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512 # Special values are signified by _is_special == True |
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513 |
| 33695 | 514 # We're immutable, so use __new__ not __init__ |
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515 def __new__(cls, value="0", context=None): |
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516 """Create a decimal point instance. |
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517 |
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518 >>> Decimal('3.14') # string input |
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519 Decimal('3.14') |
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520 >>> Decimal((0, (3, 1, 4), -2)) # tuple (sign, digit_tuple, exponent) |
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521 Decimal('3.14') |
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522 >>> Decimal(314) # int or long |
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523 Decimal('314') |
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524 >>> Decimal(Decimal(314)) # another decimal instance |
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525 Decimal('314') |
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526 >>> Decimal(' 3.14 \\n') # leading and trailing whitespace okay |
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527 Decimal('3.14') |
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528 """ |
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529 |
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530 # Note that the coefficient, self._int, is actually stored as |
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531 # a string rather than as a tuple of digits. This speeds up |
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532 # the "digits to integer" and "integer to digits" conversions |
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533 # that are used in almost every arithmetic operation on |
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534 # Decimals. This is an internal detail: the as_tuple function |
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535 # and the Decimal constructor still deal with tuples of |
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536 # digits. |
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537 |
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538 self = object.__new__(cls) |
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539 |
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540 # From a string |
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541 # REs insist on real strings, so we can too. |
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542 if isinstance(value, basestring): |
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543 m = _parser(value.strip()) |
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544 if m is None: |
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545 if context is None: |
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546 context = getcontext() |
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547 return context._raise_error(ConversionSyntax, |
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548 "Invalid literal for Decimal: %r" % value) |
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549 |
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550 if m.group('sign') == "-": |
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551 self._sign = 1 |
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552 else: |
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553 self._sign = 0 |
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554 intpart = m.group('int') |
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555 if intpart is not None: |
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556 # finite number |
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557 fracpart = m.group('frac') |
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558 exp = int(m.group('exp') or '0') |
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559 if fracpart is not None: |
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560 self._int = str((intpart+fracpart).lstrip('0') or '0') |
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561 self._exp = exp - len(fracpart) |
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562 else: |
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563 self._int = str(intpart.lstrip('0') or '0') |
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564 self._exp = exp |
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565 self._is_special = False |
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566 else: |
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567 diag = m.group('diag') |
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568 if diag is not None: |
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569 # NaN |
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570 self._int = str(diag.lstrip('0')) |
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571 if m.group('signal'): |
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572 self._exp = 'N' |
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573 else: |
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574 self._exp = 'n' |
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575 else: |
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576 # infinity |
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577 self._int = '0' |
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578 self._exp = 'F' |
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579 self._is_special = True |
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580 return self |
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581 |
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582 # From an integer |
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583 if isinstance(value, (int,long)): |
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584 if value >= 0: |
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585 self._sign = 0 |
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586 else: |
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587 self._sign = 1 |
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588 self._exp = 0 |
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589 self._int = str(abs(value)) |
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590 self._is_special = False |
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591 return self |
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592 |
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593 # From another decimal |
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594 if isinstance(value, Decimal): |
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595 self._exp = value._exp |
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596 self._sign = value._sign |
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597 self._int = value._int |
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598 self._is_special = value._is_special |
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599 return self |
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600 |
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601 # From an internal working value |
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602 if isinstance(value, _WorkRep): |
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603 self._sign = value.sign |
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604 self._int = str(value.int) |
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605 self._exp = int(value.exp) |
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606 self._is_special = False |
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607 return self |
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608 |
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609 # tuple/list conversion (possibly from as_tuple()) |
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610 if isinstance(value, (list,tuple)): |
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611 if len(value) != 3: |
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612 raise ValueError('Invalid tuple size in creation of Decimal ' |
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613 'from list or tuple. The list or tuple ' |
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614 'should have exactly three elements.') |
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615 # process sign. The isinstance test rejects floats |
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616 if not (isinstance(value[0], (int, long)) and value[0] in (0,1)): |
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617 raise ValueError("Invalid sign. The first value in the tuple " |
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618 "should be an integer; either 0 for a " |
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619 "positive number or 1 for a negative number.") |
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620 self._sign = value[0] |
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621 if value[2] == 'F': |
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622 # infinity: value[1] is ignored |
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623 self._int = '0' |
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624 self._exp = value[2] |
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625 self._is_special = True |
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626 else: |
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627 # process and validate the digits in value[1] |
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628 digits = [] |
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629 for digit in value[1]: |
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630 if isinstance(digit, (int, long)) and 0 <= digit <= 9: |
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631 # skip leading zeros |
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632 if digits or digit != 0: |
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633 digits.append(digit) |
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634 else: |
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635 raise ValueError("The second value in the tuple must " |
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636 "be composed of integers in the range " |
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637 "0 through 9.") |
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638 if value[2] in ('n', 'N'): |
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639 # NaN: digits form the diagnostic |
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640 self._int = ''.join(map(str, digits)) |
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641 self._exp = value[2] |
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642 self._is_special = True |
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643 elif isinstance(value[2], (int, long)): |
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644 # finite number: digits give the coefficient |
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645 self._int = ''.join(map(str, digits or [0])) |
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646 self._exp = value[2] |
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647 self._is_special = False |
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648 else: |
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649 raise ValueError("The third value in the tuple must " |
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650 "be an integer, or one of the " |
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651 "strings 'F', 'n', 'N'.") |
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652 return self |
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653 |
|
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654 if isinstance(value, float): |
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655 raise TypeError("Cannot convert float to Decimal. " + |
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656 "First convert the float to a string") |
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657 |
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658 raise TypeError("Cannot convert %r to Decimal" % value) |
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659 |
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660 # @classmethod, but @decorator is not valid Python 2.3 syntax, so |
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661 # don't use it (see notes on Py2.3 compatibility at top of file) |
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662 def from_float(cls, f): |
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663 """Converts a float to a decimal number, exactly. |
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664 |
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665 Note that Decimal.from_float(0.1) is not the same as Decimal('0.1'). |
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666 Since 0.1 is not exactly representable in binary floating point, the |
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667 value is stored as the nearest representable value which is |
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668 0x1.999999999999ap-4. The exact equivalent of the value in decimal |
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669 is 0.1000000000000000055511151231257827021181583404541015625. |
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670 |
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671 >>> Decimal.from_float(0.1) |
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672 Decimal('0.1000000000000000055511151231257827021181583404541015625') |
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673 >>> Decimal.from_float(float('nan')) |
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674 Decimal('NaN') |
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675 >>> Decimal.from_float(float('inf')) |
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676 Decimal('Infinity') |
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677 >>> Decimal.from_float(-float('inf')) |
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678 Decimal('-Infinity') |
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679 >>> Decimal.from_float(-0.0) |
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680 Decimal('-0') |
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681 |
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682 """ |
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683 if isinstance(f, (int, long)): # handle integer inputs |
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684 return cls(f) |
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685 if _math.isinf(f) or _math.isnan(f): # raises TypeError if not a float |
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686 return cls(repr(f)) |
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687 if _math.copysign(1.0, f) == 1.0: |
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688 sign = 0 |
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689 else: |
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690 sign = 1 |
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691 n, d = abs(f).as_integer_ratio() |
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692 k = d.bit_length() - 1 |
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693 result = _dec_from_triple(sign, str(n*5**k), -k) |
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694 if cls is Decimal: |
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changeset
|
695 return result |
|
2cafe989117a
Fix Decimal.from_float to use valid Python 2.3 syntax, as per
Mark Dickinson <dickinsm@gmail.com>
parents:
50497
diff
changeset
|
696 else: |
|
2cafe989117a
Fix Decimal.from_float to use valid Python 2.3 syntax, as per
Mark Dickinson <dickinsm@gmail.com>
parents:
50497
diff
changeset
|
697 return cls(result) |
|
2cafe989117a
Fix Decimal.from_float to use valid Python 2.3 syntax, as per
Mark Dickinson <dickinsm@gmail.com>
parents:
50497
diff
changeset
|
698 from_float = classmethod(from_float) |
|
50496
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
699 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
700 def _isnan(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
701 """Returns whether the number is not actually one. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
702 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
703 0 if a number |
|
44352
f7bc79112bcf
Some minor cleanups. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44328
diff
changeset
|
704 1 if NaN |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
705 2 if sNaN |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
706 """ |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
707 if self._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
708 exp = self._exp |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
709 if exp == 'n': |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
710 return 1 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
711 elif exp == 'N': |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
712 return 2 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
713 return 0 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
714 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
715 def _isinfinity(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
716 """Returns whether the number is infinite |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
717 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
718 0 if finite or not a number |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
719 1 if +INF |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
720 -1 if -INF |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
721 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
722 if self._exp == 'F': |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
723 if self._sign: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
724 return -1 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
725 return 1 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
726 return 0 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
727 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
728 def _check_nans(self, other=None, context=None): |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
729 """Returns whether the number is not actually one. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
730 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
731 if self, other are sNaN, signal |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
732 if self, other are NaN return nan |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
733 return 0 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
734 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
735 Done before operations. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
736 """ |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
737 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
738 self_is_nan = self._isnan() |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
739 if other is None: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
740 other_is_nan = False |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
741 else: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
742 other_is_nan = other._isnan() |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
743 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
744 if self_is_nan or other_is_nan: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
745 if context is None: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
746 context = getcontext() |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
747 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
748 if self_is_nan == 2: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
749 return context._raise_error(InvalidOperation, 'sNaN', |
|
44352
f7bc79112bcf
Some minor cleanups. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44328
diff
changeset
|
750 self) |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
751 if other_is_nan == 2: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
752 return context._raise_error(InvalidOperation, 'sNaN', |
|
44352
f7bc79112bcf
Some minor cleanups. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44328
diff
changeset
|
753 other) |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
754 if self_is_nan: |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
755 return self._fix_nan(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
756 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
757 return other._fix_nan(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
758 return 0 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
759 |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
760 def _compare_check_nans(self, other, context): |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
761 """Version of _check_nans used for the signaling comparisons |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
762 compare_signal, __le__, __lt__, __ge__, __gt__. |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
763 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
764 Signal InvalidOperation if either self or other is a (quiet |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
765 or signaling) NaN. Signaling NaNs take precedence over quiet |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
766 NaNs. |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
767 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
768 Return 0 if neither operand is a NaN. |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
769 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
770 """ |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
771 if context is None: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
772 context = getcontext() |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
773 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
774 if self._is_special or other._is_special: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
775 if self.is_snan(): |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
776 return context._raise_error(InvalidOperation, |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
777 'comparison involving sNaN', |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
778 self) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
779 elif other.is_snan(): |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
780 return context._raise_error(InvalidOperation, |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
781 'comparison involving sNaN', |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
782 other) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
783 elif self.is_qnan(): |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
784 return context._raise_error(InvalidOperation, |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
785 'comparison involving NaN', |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
786 self) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
787 elif other.is_qnan(): |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
788 return context._raise_error(InvalidOperation, |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
789 'comparison involving NaN', |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
790 other) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
791 return 0 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
792 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
793 def __nonzero__(self): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
794 """Return True if self is nonzero; otherwise return False. |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
795 |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
796 NaNs and infinities are considered nonzero. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
797 """ |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
798 return self._is_special or self._int != '0' |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
799 |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
800 def _cmp(self, other): |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
801 """Compare the two non-NaN decimal instances self and other. |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
802 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
803 Returns -1 if self < other, 0 if self == other and 1 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
804 if self > other. This routine is for internal use only.""" |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
805 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
806 if self._is_special or other._is_special: |
|
51027
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
807 self_inf = self._isinfinity() |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
808 other_inf = other._isinfinity() |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
809 if self_inf == other_inf: |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
810 return 0 |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
811 elif self_inf < other_inf: |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
812 return -1 |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
813 else: |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
814 return 1 |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
815 |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
816 # check for zeros; Decimal('0') == Decimal('-0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
817 if not self: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
818 if not other: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
819 return 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
820 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
821 return -((-1)**other._sign) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
822 if not other: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
823 return (-1)**self._sign |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
824 |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
825 # If different signs, neg one is less |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
826 if other._sign < self._sign: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
827 return -1 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
828 if self._sign < other._sign: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
829 return 1 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
830 |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
831 self_adjusted = self.adjusted() |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
832 other_adjusted = other.adjusted() |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
833 if self_adjusted == other_adjusted: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
834 self_padded = self._int + '0'*(self._exp - other._exp) |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
835 other_padded = other._int + '0'*(other._exp - self._exp) |
|
51027
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
836 if self_padded == other_padded: |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
837 return 0 |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
838 elif self_padded < other_padded: |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
839 return -(-1)**self._sign |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
840 else: |
|
c4c4e4b1dc1a
Remove uses of cmp from the decimal module.
Mark Dickinson <dickinsm@gmail.com>
parents:
50598
diff
changeset
|
841 return (-1)**self._sign |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
842 elif self_adjusted > other_adjusted: |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
843 return (-1)**self._sign |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
844 else: # self_adjusted < other_adjusted |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
845 return -((-1)**self._sign) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
846 |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
847 # Note: The Decimal standard doesn't cover rich comparisons for |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
848 # Decimals. In particular, the specification is silent on the |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
849 # subject of what should happen for a comparison involving a NaN. |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
850 # We take the following approach: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
851 # |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
852 # == comparisons involving a NaN always return False |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
853 # != comparisons involving a NaN always return True |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
854 # <, >, <= and >= comparisons involving a (quiet or signaling) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
855 # NaN signal InvalidOperation, and return False if the |
|
45269
fb551c938a59
Typos in decimal comment and documentation
Mark Dickinson <dickinsm@gmail.com>
parents:
45201
diff
changeset
|
856 # InvalidOperation is not trapped. |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
857 # |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
858 # This behavior is designed to conform as closely as possible to |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
859 # that specified by IEEE 754. |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
860 |
|
32505
191796b7a054
* Add __eq__ and __ne__ so that things like list.index() work properly
Raymond Hettinger <python@rcn.com>
parents:
32499
diff
changeset
|
861 def __eq__(self, other): |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
862 other = _convert_other(other) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
863 if other is NotImplemented: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
864 return other |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
865 if self.is_nan() or other.is_nan(): |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
866 return False |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
867 return self._cmp(other) == 0 |
|
32505
191796b7a054
* Add __eq__ and __ne__ so that things like list.index() work properly
Raymond Hettinger <python@rcn.com>
parents:
32499
diff
changeset
|
868 |
|
191796b7a054
* Add __eq__ and __ne__ so that things like list.index() work properly
Raymond Hettinger <python@rcn.com>
parents:
32499
diff
changeset
|
869 def __ne__(self, other): |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
870 other = _convert_other(other) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
871 if other is NotImplemented: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
872 return other |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
873 if self.is_nan() or other.is_nan(): |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
874 return True |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
875 return self._cmp(other) != 0 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
876 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
877 def __lt__(self, other, context=None): |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
878 other = _convert_other(other) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
879 if other is NotImplemented: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
880 return other |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
881 ans = self._compare_check_nans(other, context) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
882 if ans: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
883 return False |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
884 return self._cmp(other) < 0 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
885 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
886 def __le__(self, other, context=None): |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
887 other = _convert_other(other) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
888 if other is NotImplemented: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
889 return other |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
890 ans = self._compare_check_nans(other, context) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
891 if ans: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
892 return False |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
893 return self._cmp(other) <= 0 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
894 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
895 def __gt__(self, other, context=None): |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
896 other = _convert_other(other) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
897 if other is NotImplemented: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
898 return other |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
899 ans = self._compare_check_nans(other, context) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
900 if ans: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
901 return False |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
902 return self._cmp(other) > 0 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
903 |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
904 def __ge__(self, other, context=None): |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
905 other = _convert_other(other) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
906 if other is NotImplemented: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
907 return other |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
908 ans = self._compare_check_nans(other, context) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
909 if ans: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
910 return False |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
911 return self._cmp(other) >= 0 |
|
32505
191796b7a054
* Add __eq__ and __ne__ so that things like list.index() work properly
Raymond Hettinger <python@rcn.com>
parents:
32499
diff
changeset
|
912 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
913 def compare(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
914 """Compares one to another. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
915 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
916 -1 => a < b |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
917 0 => a = b |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
918 1 => a > b |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
919 NaN => one is NaN |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
920 Like __cmp__, but returns Decimal instances. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
921 """ |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
922 other = _convert_other(other, raiseit=True) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
923 |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
924 # Compare(NaN, NaN) = NaN |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
925 if (self._is_special or other and other._is_special): |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
926 ans = self._check_nans(other, context) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
927 if ans: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
928 return ans |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
929 |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
930 return Decimal(self._cmp(other)) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
931 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
932 def __hash__(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
933 """x.__hash__() <==> hash(x)""" |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
934 # Decimal integers must hash the same as the ints |
|
44593
057de46ea17e
Issue #1757: The hash of a Decimal instance is no longer affected
Facundo Batista <facundobatista@gmail.com>
parents:
44352
diff
changeset
|
935 # |
|
057de46ea17e
Issue #1757: The hash of a Decimal instance is no longer affected
Facundo Batista <facundobatista@gmail.com>
parents:
44352
diff
changeset
|
936 # The hash of a nonspecial noninteger Decimal must depend only |
|
057de46ea17e
Issue #1757: The hash of a Decimal instance is no longer affected
Facundo Batista <facundobatista@gmail.com>
parents:
44352
diff
changeset
|
937 # on the value of that Decimal, and not on its representation. |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
938 # For example: hash(Decimal('100E-1')) == hash(Decimal('10')). |
|
34758
50509ee96364
Bug #1163325: "special" decimals aren't hashable
Raymond Hettinger <python@rcn.com>
parents:
34638
diff
changeset
|
939 if self._is_special: |
|
50509ee96364
Bug #1163325: "special" decimals aren't hashable
Raymond Hettinger <python@rcn.com>
parents:
34638
diff
changeset
|
940 if self._isnan(): |
|
50509ee96364
Bug #1163325: "special" decimals aren't hashable
Raymond Hettinger <python@rcn.com>
parents:
34638
diff
changeset
|
941 raise TypeError('Cannot hash a NaN value.') |
|
50509ee96364
Bug #1163325: "special" decimals aren't hashable
Raymond Hettinger <python@rcn.com>
parents:
34638
diff
changeset
|
942 return hash(str(self)) |
|
43409
357cf07a23fe
Issue #1772851. Optimization of __hash__ to behave better for big big
Facundo Batista <facundobatista@gmail.com>
parents:
43391
diff
changeset
|
943 if not self: |
|
357cf07a23fe
Issue #1772851. Optimization of __hash__ to behave better for big big
Facundo Batista <facundobatista@gmail.com>
parents:
43391
diff
changeset
|
944 return 0 |
|
357cf07a23fe
Issue #1772851. Optimization of __hash__ to behave better for big big
Facundo Batista <facundobatista@gmail.com>
parents:
43391
diff
changeset
|
945 if self._isinteger(): |
|
357cf07a23fe
Issue #1772851. Optimization of __hash__ to behave better for big big
Facundo Batista <facundobatista@gmail.com>
parents:
43391
diff
changeset
|
946 op = _WorkRep(self.to_integral_value()) |
|
357cf07a23fe
Issue #1772851. Optimization of __hash__ to behave better for big big
Facundo Batista <facundobatista@gmail.com>
parents:
43391
diff
changeset
|
947 # to make computation feasible for Decimals with large |
|
357cf07a23fe
Issue #1772851. Optimization of __hash__ to behave better for big big
Facundo Batista <facundobatista@gmail.com>
parents:
43391
diff
changeset
|
948 # exponent, we use the fact that hash(n) == hash(m) for |
|
357cf07a23fe
Issue #1772851. Optimization of __hash__ to behave better for big big
Facundo Batista <facundobatista@gmail.com>
parents:
43391
diff
changeset
|
949 # any two nonzero integers n and m such that (i) n and m |
|
357cf07a23fe
Issue #1772851. Optimization of __hash__ to behave better for big big
Facundo Batista <facundobatista@gmail.com>
parents:
43391
diff
changeset
|
950 # have the same sign, and (ii) n is congruent to m modulo |
|
357cf07a23fe
Issue #1772851. Optimization of __hash__ to behave better for big big
Facundo Batista <facundobatista@gmail.com>
parents:
43391
diff
changeset
|
951 # 2**64-1. So we can replace hash((-1)**s*c*10**e) with |
|
357cf07a23fe
Issue #1772851. Optimization of __hash__ to behave better for big big
Facundo Batista <facundobatista@gmail.com>
parents:
43391
diff
changeset
|
952 # hash((-1)**s*c*pow(10, e, 2**64-1). |
|
357cf07a23fe
Issue #1772851. Optimization of __hash__ to behave better for big big
Facundo Batista <facundobatista@gmail.com>
parents:
43391
diff
changeset
|
953 return hash((-1)**op.sign*op.int*pow(10, op.exp, 2**64-1)) |
|
44593
057de46ea17e
Issue #1757: The hash of a Decimal instance is no longer affected
Facundo Batista <facundobatista@gmail.com>
parents:
44352
diff
changeset
|
954 # The value of a nonzero nonspecial Decimal instance is |
|
057de46ea17e
Issue #1757: The hash of a Decimal instance is no longer affected
Facundo Batista <facundobatista@gmail.com>
parents:
44352
diff
changeset
|
955 # faithfully represented by the triple consisting of its sign, |
|
057de46ea17e
Issue #1757: The hash of a Decimal instance is no longer affected
Facundo Batista <facundobatista@gmail.com>
parents:
44352
diff
changeset
|
956 # its adjusted exponent, and its coefficient with trailing |
|
057de46ea17e
Issue #1757: The hash of a Decimal instance is no longer affected
Facundo Batista <facundobatista@gmail.com>
parents:
44352
diff
changeset
|
957 # zeros removed. |
|
057de46ea17e
Issue #1757: The hash of a Decimal instance is no longer affected
Facundo Batista <facundobatista@gmail.com>
parents:
44352
diff
changeset
|
958 return hash((self._sign, |
|
057de46ea17e
Issue #1757: The hash of a Decimal instance is no longer affected
Facundo Batista <facundobatista@gmail.com>
parents:
44352
diff
changeset
|
959 self._exp+len(self._int), |
|
057de46ea17e
Issue #1757: The hash of a Decimal instance is no longer affected
Facundo Batista <facundobatista@gmail.com>
parents:
44352
diff
changeset
|
960 self._int.rstrip('0'))) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
961 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
962 def as_tuple(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
963 """Represents the number as a triple tuple. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
964 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
965 To show the internals exactly as they are. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
966 """ |
|
44631
3cd9b877eae0
Have Decimal.as_tuple return a named tuple.
Raymond Hettinger <python@rcn.com>
parents:
44593
diff
changeset
|
967 return DecimalTuple(self._sign, tuple(map(int, self._int)), self._exp) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
968 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
969 def __repr__(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
970 """Represents the number as an instance of Decimal.""" |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
971 # Invariant: eval(repr(d)) == d |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
972 return "Decimal('%s')" % str(self) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
973 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
974 def __str__(self, eng=False, context=None): |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
975 """Return string representation of the number in scientific notation. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
976 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
977 Captures all of the information in the underlying representation. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
978 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
979 |
|
44120
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
980 sign = ['', '-'][self._sign] |
|
35113
adf189eb4f58
Apply the _is_special guard.
Raymond Hettinger <python@rcn.com>
parents:
35035
diff
changeset
|
981 if self._is_special: |
|
44120
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
982 if self._exp == 'F': |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
983 return sign + 'Infinity' |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
984 elif self._exp == 'n': |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
985 return sign + 'NaN' + self._int |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
986 else: # self._exp == 'N' |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
987 return sign + 'sNaN' + self._int |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
988 |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
989 # number of digits of self._int to left of decimal point |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
990 leftdigits = self._exp + len(self._int) |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
991 |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
992 # dotplace is number of digits of self._int to the left of the |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
993 # decimal point in the mantissa of the output string (that is, |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
994 # after adjusting the exponent) |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
995 if self._exp <= 0 and leftdigits > -6: |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
996 # no exponent required |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
997 dotplace = leftdigits |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
998 elif not eng: |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
999 # usual scientific notation: 1 digit on left of the point |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1000 dotplace = 1 |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1001 elif self._int == '0': |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1002 # engineering notation, zero |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1003 dotplace = (leftdigits + 1) % 3 - 1 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1004 else: |
|
44120
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1005 # engineering notation, nonzero |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1006 dotplace = (leftdigits - 1) % 3 + 1 |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1007 |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1008 if dotplace <= 0: |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1009 intpart = '0' |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1010 fracpart = '.' + '0'*(-dotplace) + self._int |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1011 elif dotplace >= len(self._int): |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1012 intpart = self._int+'0'*(dotplace-len(self._int)) |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1013 fracpart = '' |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1014 else: |
|
44120
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1015 intpart = self._int[:dotplace] |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1016 fracpart = '.' + self._int[dotplace:] |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1017 if leftdigits == dotplace: |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1018 exp = '' |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1019 else: |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1020 if context is None: |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1021 context = getcontext() |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1022 exp = ['e', 'E'][context.capitals] + "%+d" % (leftdigits-dotplace) |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1023 |
|
fe6bedafb46a
Speedup and cleaning of __str__. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44068
diff
changeset
|
1024 return sign + intpart + fracpart + exp |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1025 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1026 def to_eng_string(self, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1027 """Convert to engineering-type string. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1028 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1029 Engineering notation has an exponent which is a multiple of 3, so there |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1030 are up to 3 digits left of the decimal place. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1031 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1032 Same rules for when in exponential and when as a value as in __str__. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1033 """ |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1034 return self.__str__(eng=True, context=context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1035 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1036 def __neg__(self, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1037 """Returns a copy with the sign switched. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1038 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1039 Rounds, if it has reason. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1040 """ |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1041 if self._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1042 ans = self._check_nans(context=context) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1043 if ans: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1044 return ans |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1045 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1046 if not self: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1047 # -Decimal('0') is Decimal('0'), not Decimal('-0') |
|
44352
f7bc79112bcf
Some minor cleanups. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44328
diff
changeset
|
1048 ans = self.copy_abs() |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1049 else: |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1050 ans = self.copy_negate() |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1051 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1052 if context is None: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1053 context = getcontext() |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1054 return ans._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1055 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1056 def __pos__(self, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1057 """Returns a copy, unless it is a sNaN. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1058 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1059 Rounds the number (if more then precision digits) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1060 """ |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1061 if self._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1062 ans = self._check_nans(context=context) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1063 if ans: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1064 return ans |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1065 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1066 if not self: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1067 # + (-0) = 0 |
|
44352
f7bc79112bcf
Some minor cleanups. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44328
diff
changeset
|
1068 ans = self.copy_abs() |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1069 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1070 ans = Decimal(self) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1071 |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1072 if context is None: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1073 context = getcontext() |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1074 return ans._fix(context) |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1075 |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1076 def __abs__(self, round=True, context=None): |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1077 """Returns the absolute value of self. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1078 |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1079 If the keyword argument 'round' is false, do not round. The |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1080 expression self.__abs__(round=False) is equivalent to |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1081 self.copy_abs(). |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1082 """ |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1083 if not round: |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1084 return self.copy_abs() |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1085 |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1086 if self._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1087 ans = self._check_nans(context=context) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1088 if ans: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1089 return ans |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1090 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1091 if self._sign: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1092 ans = self.__neg__(context=context) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1093 else: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1094 ans = self.__pos__(context=context) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1095 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1096 return ans |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1097 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1098 def __add__(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1099 """Returns self + other. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1100 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1101 -INF + INF (or the reverse) cause InvalidOperation errors. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1102 """ |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1103 other = _convert_other(other) |
|
34812
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1104 if other is NotImplemented: |
|
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1105 return other |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1106 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1107 if context is None: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1108 context = getcontext() |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1109 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1110 if self._is_special or other._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1111 ans = self._check_nans(other, context) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1112 if ans: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1113 return ans |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1114 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1115 if self._isinfinity(): |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
1116 # If both INF, same sign => same as both, opposite => error. |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1117 if self._sign != other._sign and other._isinfinity(): |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1118 return context._raise_error(InvalidOperation, '-INF + INF') |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1119 return Decimal(self) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1120 if other._isinfinity(): |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
1121 return Decimal(other) # Can't both be infinity here |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1122 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1123 exp = min(self._exp, other._exp) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1124 negativezero = 0 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1125 if context.rounding == ROUND_FLOOR and self._sign != other._sign: |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
1126 # If the answer is 0, the sign should be negative, in this case. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1127 negativezero = 1 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1128 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1129 if not self and not other: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1130 sign = min(self._sign, other._sign) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1131 if negativezero: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1132 sign = 1 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1133 ans = _dec_from_triple(sign, '0', exp) |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1134 ans = ans._fix(context) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1135 return ans |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1136 if not self: |
|
33845
032f342efcd2
Very few little improvements.
Facundo Batista <facundobatista@gmail.com>
parents:
33803
diff
changeset
|
1137 exp = max(exp, other._exp - context.prec-1) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1138 ans = other._rescale(exp, context.rounding) |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1139 ans = ans._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1140 return ans |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1141 if not other: |
|
33845
032f342efcd2
Very few little improvements.
Facundo Batista <facundobatista@gmail.com>
parents:
33803
diff
changeset
|
1142 exp = max(exp, self._exp - context.prec-1) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1143 ans = self._rescale(exp, context.rounding) |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1144 ans = ans._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1145 return ans |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1146 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1147 op1 = _WorkRep(self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1148 op2 = _WorkRep(other) |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1149 op1, op2 = _normalize(op1, op2, context.prec) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1150 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1151 result = _WorkRep() |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1152 if op1.sign != op2.sign: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1153 # Equal and opposite |
| 33851 | 1154 if op1.int == op2.int: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1155 ans = _dec_from_triple(negativezero, '0', exp) |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1156 ans = ans._fix(context) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1157 return ans |
| 33851 | 1158 if op1.int < op2.int: |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1159 op1, op2 = op2, op1 |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
1160 # OK, now abs(op1) > abs(op2) |
| 33851 | 1161 if op1.sign == 1: |
| 1162 result.sign = 1 | |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1163 op1.sign, op2.sign = op2.sign, op1.sign |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1164 else: |
| 33851 | 1165 result.sign = 0 |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
1166 # So we know the sign, and op1 > 0. |
| 33851 | 1167 elif op1.sign == 1: |
| 1168 result.sign = 1 | |
| 1169 op1.sign, op2.sign = (0, 0) | |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1170 else: |
| 33851 | 1171 result.sign = 0 |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
1172 # Now, op1 > abs(op2) > 0 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1173 |
| 33851 | 1174 if op2.sign == 0: |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1175 result.int = op1.int + op2.int |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1176 else: |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1177 result.int = op1.int - op2.int |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1178 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1179 result.exp = op1.exp |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1180 ans = Decimal(result) |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1181 ans = ans._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1182 return ans |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1183 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1184 __radd__ = __add__ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1185 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1186 def __sub__(self, other, context=None): |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1187 """Return self - other""" |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1188 other = _convert_other(other) |
|
34812
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1189 if other is NotImplemented: |
|
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1190 return other |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1191 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1192 if self._is_special or other._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1193 ans = self._check_nans(other, context=context) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1194 if ans: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1195 return ans |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1196 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1197 # self - other is computed as self + other.copy_negate() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1198 return self.__add__(other.copy_negate(), context=context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1199 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1200 def __rsub__(self, other, context=None): |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1201 """Return other - self""" |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1202 other = _convert_other(other) |
|
34812
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1203 if other is NotImplemented: |
|
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1204 return other |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1205 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1206 return other.__sub__(self, context=context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1207 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1208 def __mul__(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1209 """Return self * other. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1210 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1211 (+-) INF * 0 (or its reverse) raise InvalidOperation. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1212 """ |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1213 other = _convert_other(other) |
|
34812
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1214 if other is NotImplemented: |
|
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1215 return other |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1216 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1217 if context is None: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1218 context = getcontext() |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1219 |
|
32561
6f351b1bcf53
* Update the test suite to reflect that ConversionSyntax was no longer
Raymond Hettinger <python@rcn.com>
parents:
32560
diff
changeset
|
1220 resultsign = self._sign ^ other._sign |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1221 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1222 if self._is_special or other._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1223 ans = self._check_nans(other, context) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1224 if ans: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1225 return ans |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1226 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1227 if self._isinfinity(): |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1228 if not other: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1229 return context._raise_error(InvalidOperation, '(+-)INF * 0') |
| 50497 | 1230 return _SignedInfinity[resultsign] |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1231 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1232 if other._isinfinity(): |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1233 if not self: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1234 return context._raise_error(InvalidOperation, '0 * (+-)INF') |
| 50497 | 1235 return _SignedInfinity[resultsign] |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1236 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1237 resultexp = self._exp + other._exp |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1238 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1239 # Special case for multiplying by zero |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1240 if not self or not other: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1241 ans = _dec_from_triple(resultsign, '0', resultexp) |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1242 # Fixing in case the exponent is out of bounds |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1243 ans = ans._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1244 return ans |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1245 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1246 # Special case for multiplying by power of 10 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1247 if self._int == '1': |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1248 ans = _dec_from_triple(resultsign, other._int, resultexp) |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1249 ans = ans._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1250 return ans |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1251 if other._int == '1': |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1252 ans = _dec_from_triple(resultsign, self._int, resultexp) |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1253 ans = ans._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1254 return ans |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1255 |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1256 op1 = _WorkRep(self) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1257 op2 = _WorkRep(other) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1258 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1259 ans = _dec_from_triple(resultsign, str(op1.int * op2.int), resultexp) |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1260 ans = ans._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1261 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1262 return ans |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1263 __rmul__ = __mul__ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1264 |
|
46651
c97e36abcdd5
Some very minor changes to decimal.py in Python 2.6, aimed
Mark Dickinson <dickinsm@gmail.com>
parents:
46643
diff
changeset
|
1265 def __truediv__(self, other, context=None): |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1266 """Return self / other.""" |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1267 other = _convert_other(other) |
|
34812
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1268 if other is NotImplemented: |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1269 return NotImplemented |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1270 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1271 if context is None: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1272 context = getcontext() |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1273 |
|
32561
6f351b1bcf53
* Update the test suite to reflect that ConversionSyntax was no longer
Raymond Hettinger <python@rcn.com>
parents:
32560
diff
changeset
|
1274 sign = self._sign ^ other._sign |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1275 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1276 if self._is_special or other._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1277 ans = self._check_nans(other, context) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1278 if ans: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1279 return ans |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1280 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1281 if self._isinfinity() and other._isinfinity(): |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1282 return context._raise_error(InvalidOperation, '(+-)INF/(+-)INF') |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1283 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1284 if self._isinfinity(): |
| 50497 | 1285 return _SignedInfinity[sign] |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1286 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1287 if other._isinfinity(): |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1288 context._raise_error(Clamped, 'Division by infinity') |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1289 return _dec_from_triple(sign, '0', context.Etiny()) |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1290 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1291 # Special cases for zeroes |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1292 if not other: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1293 if not self: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1294 return context._raise_error(DivisionUndefined, '0 / 0') |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1295 return context._raise_error(DivisionByZero, 'x / 0', sign) |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1296 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1297 if not self: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1298 exp = self._exp - other._exp |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1299 coeff = 0 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1300 else: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1301 # OK, so neither = 0, INF or NaN |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1302 shift = len(other._int) - len(self._int) + context.prec + 1 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1303 exp = self._exp - other._exp - shift |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1304 op1 = _WorkRep(self) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1305 op2 = _WorkRep(other) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1306 if shift >= 0: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1307 coeff, remainder = divmod(op1.int * 10**shift, op2.int) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1308 else: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1309 coeff, remainder = divmod(op1.int, op2.int * 10**-shift) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1310 if remainder: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1311 # result is not exact; adjust to ensure correct rounding |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1312 if coeff % 5 == 0: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1313 coeff += 1 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1314 else: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1315 # result is exact; get as close to ideal exponent as possible |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1316 ideal_exp = self._exp - other._exp |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1317 while exp < ideal_exp and coeff % 10 == 0: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1318 coeff //= 10 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1319 exp += 1 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1320 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1321 ans = _dec_from_triple(sign, str(coeff), exp) |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1322 return ans._fix(context) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1323 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1324 def _divide(self, other, context): |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1325 """Return (self // other, self % other), to context.prec precision. |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1326 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1327 Assumes that neither self nor other is a NaN, that self is not |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1328 infinite and that other is nonzero. |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1329 """ |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1330 sign = self._sign ^ other._sign |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1331 if other._isinfinity(): |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1332 ideal_exp = self._exp |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1333 else: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1334 ideal_exp = min(self._exp, other._exp) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1335 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1336 expdiff = self.adjusted() - other.adjusted() |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1337 if not self or other._isinfinity() or expdiff <= -2: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1338 return (_dec_from_triple(sign, '0', 0), |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1339 self._rescale(ideal_exp, context.rounding)) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1340 if expdiff <= context.prec: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1341 op1 = _WorkRep(self) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1342 op2 = _WorkRep(other) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1343 if op1.exp >= op2.exp: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1344 op1.int *= 10**(op1.exp - op2.exp) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1345 else: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1346 op2.int *= 10**(op2.exp - op1.exp) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1347 q, r = divmod(op1.int, op2.int) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1348 if q < 10**context.prec: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1349 return (_dec_from_triple(sign, str(q), 0), |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1350 _dec_from_triple(self._sign, str(r), ideal_exp)) |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1351 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1352 # Here the quotient is too large to be representable |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1353 ans = context._raise_error(DivisionImpossible, |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1354 'quotient too large in //, % or divmod') |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1355 return ans, ans |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1356 |
|
46651
c97e36abcdd5
Some very minor changes to decimal.py in Python 2.6, aimed
Mark Dickinson <dickinsm@gmail.com>
parents:
46643
diff
changeset
|
1357 def __rtruediv__(self, other, context=None): |
|
c97e36abcdd5
Some very minor changes to decimal.py in Python 2.6, aimed
Mark Dickinson <dickinsm@gmail.com>
parents:
46643
diff
changeset
|
1358 """Swaps self/other and returns __truediv__.""" |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1359 other = _convert_other(other) |
|
34812
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1360 if other is NotImplemented: |
|
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1361 return other |
|
46651
c97e36abcdd5
Some very minor changes to decimal.py in Python 2.6, aimed
Mark Dickinson <dickinsm@gmail.com>
parents:
46643
diff
changeset
|
1362 return other.__truediv__(self, context=context) |
|
c97e36abcdd5
Some very minor changes to decimal.py in Python 2.6, aimed
Mark Dickinson <dickinsm@gmail.com>
parents:
46643
diff
changeset
|
1363 |
|
c97e36abcdd5
Some very minor changes to decimal.py in Python 2.6, aimed
Mark Dickinson <dickinsm@gmail.com>
parents:
46643
diff
changeset
|
1364 __div__ = __truediv__ |
|
c97e36abcdd5
Some very minor changes to decimal.py in Python 2.6, aimed
Mark Dickinson <dickinsm@gmail.com>
parents:
46643
diff
changeset
|
1365 __rdiv__ = __rtruediv__ |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1366 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1367 def __divmod__(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1368 """ |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1369 Return (self // other, self % other) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1370 """ |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1371 other = _convert_other(other) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1372 if other is NotImplemented: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1373 return other |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1374 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1375 if context is None: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1376 context = getcontext() |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1377 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1378 ans = self._check_nans(other, context) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1379 if ans: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1380 return (ans, ans) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1381 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1382 sign = self._sign ^ other._sign |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1383 if self._isinfinity(): |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1384 if other._isinfinity(): |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1385 ans = context._raise_error(InvalidOperation, 'divmod(INF, INF)') |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1386 return ans, ans |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1387 else: |
| 50497 | 1388 return (_SignedInfinity[sign], |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1389 context._raise_error(InvalidOperation, 'INF % x')) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1390 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1391 if not other: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1392 if not self: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1393 ans = context._raise_error(DivisionUndefined, 'divmod(0, 0)') |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1394 return ans, ans |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1395 else: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1396 return (context._raise_error(DivisionByZero, 'x // 0', sign), |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1397 context._raise_error(InvalidOperation, 'x % 0')) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1398 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1399 quotient, remainder = self._divide(other, context) |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1400 remainder = remainder._fix(context) |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1401 return quotient, remainder |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1402 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1403 def __rdivmod__(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1404 """Swaps self/other and returns __divmod__.""" |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1405 other = _convert_other(other) |
|
34812
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1406 if other is NotImplemented: |
|
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1407 return other |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1408 return other.__divmod__(self, context=context) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1409 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1410 def __mod__(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1411 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1412 self % other |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1413 """ |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1414 other = _convert_other(other) |
|
34812
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1415 if other is NotImplemented: |
|
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1416 return other |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1417 |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1418 if context is None: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1419 context = getcontext() |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1420 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1421 ans = self._check_nans(other, context) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1422 if ans: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1423 return ans |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1424 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1425 if self._isinfinity(): |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1426 return context._raise_error(InvalidOperation, 'INF % x') |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1427 elif not other: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1428 if self: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1429 return context._raise_error(InvalidOperation, 'x % 0') |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1430 else: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1431 return context._raise_error(DivisionUndefined, '0 % 0') |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1432 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1433 remainder = self._divide(other, context)[1] |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
1434 remainder = remainder._fix(context) |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1435 return remainder |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1436 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1437 def __rmod__(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1438 """Swaps self/other and returns __mod__.""" |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1439 other = _convert_other(other) |
|
34812
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1440 if other is NotImplemented: |
|
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1441 return other |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1442 return other.__mod__(self, context=context) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1443 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1444 def remainder_near(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1445 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1446 Remainder nearest to 0- abs(remainder-near) <= other/2 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1447 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1448 if context is None: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1449 context = getcontext() |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1450 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1451 other = _convert_other(other, raiseit=True) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1452 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1453 ans = self._check_nans(other, context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1454 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1455 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1456 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1457 # self == +/-infinity -> InvalidOperation |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1458 if self._isinfinity(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1459 return context._raise_error(InvalidOperation, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1460 'remainder_near(infinity, x)') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1461 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1462 # other == 0 -> either InvalidOperation or DivisionUndefined |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1463 if not other: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1464 if self: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1465 return context._raise_error(InvalidOperation, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1466 'remainder_near(x, 0)') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1467 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1468 return context._raise_error(DivisionUndefined, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1469 'remainder_near(0, 0)') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1470 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1471 # other = +/-infinity -> remainder = self |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1472 if other._isinfinity(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1473 ans = Decimal(self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1474 return ans._fix(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1475 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1476 # self = 0 -> remainder = self, with ideal exponent |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1477 ideal_exponent = min(self._exp, other._exp) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1478 if not self: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1479 ans = _dec_from_triple(self._sign, '0', ideal_exponent) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1480 return ans._fix(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1481 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1482 # catch most cases of large or small quotient |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1483 expdiff = self.adjusted() - other.adjusted() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1484 if expdiff >= context.prec + 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1485 # expdiff >= prec+1 => abs(self/other) > 10**prec |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1486 return context._raise_error(DivisionImpossible) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1487 if expdiff <= -2: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1488 # expdiff <= -2 => abs(self/other) < 0.1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1489 ans = self._rescale(ideal_exponent, context.rounding) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1490 return ans._fix(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1491 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1492 # adjust both arguments to have the same exponent, then divide |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1493 op1 = _WorkRep(self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1494 op2 = _WorkRep(other) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1495 if op1.exp >= op2.exp: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1496 op1.int *= 10**(op1.exp - op2.exp) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1497 else: |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1498 op2.int *= 10**(op2.exp - op1.exp) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1499 q, r = divmod(op1.int, op2.int) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1500 # remainder is r*10**ideal_exponent; other is +/-op2.int * |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1501 # 10**ideal_exponent. Apply correction to ensure that |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1502 # abs(remainder) <= abs(other)/2 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1503 if 2*r + (q&1) > op2.int: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1504 r -= op2.int |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1505 q += 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1506 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1507 if q >= 10**context.prec: |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1508 return context._raise_error(DivisionImpossible) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1509 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1510 # result has same sign as self unless r is negative |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1511 sign = self._sign |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1512 if r < 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1513 sign = 1-sign |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1514 r = -r |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1515 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1516 ans = _dec_from_triple(sign, str(r), ideal_exponent) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1517 return ans._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1518 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1519 def __floordiv__(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1520 """self // other""" |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1521 other = _convert_other(other) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1522 if other is NotImplemented: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1523 return other |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1524 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1525 if context is None: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1526 context = getcontext() |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1527 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1528 ans = self._check_nans(other, context) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1529 if ans: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1530 return ans |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1531 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1532 if self._isinfinity(): |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1533 if other._isinfinity(): |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1534 return context._raise_error(InvalidOperation, 'INF // INF') |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1535 else: |
| 50497 | 1536 return _SignedInfinity[self._sign ^ other._sign] |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1537 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1538 if not other: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1539 if self: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1540 return context._raise_error(DivisionByZero, 'x // 0', |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1541 self._sign ^ other._sign) |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1542 else: |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1543 return context._raise_error(DivisionUndefined, '0 // 0') |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1544 |
|
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
1545 return self._divide(other, context)[0] |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1546 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1547 def __rfloordiv__(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1548 """Swaps self/other and returns __floordiv__.""" |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1549 other = _convert_other(other) |
|
34812
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1550 if other is NotImplemented: |
|
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
1551 return other |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1552 return other.__floordiv__(self, context=context) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1553 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1554 def __float__(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1555 """Float representation.""" |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1556 return float(str(self)) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1557 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1558 def __int__(self): |
|
34638
4a0c202ee789
Fix small grammatical error in a docstring.
Brett Cannon <bcannon@gmail.com>
parents:
34545
diff
changeset
|
1559 """Converts self to an int, truncating if necessary.""" |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1560 if self._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1561 if self._isnan(): |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1562 context = getcontext() |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1563 return context._raise_error(InvalidContext) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
1564 elif self._isinfinity(): |
|
46651
c97e36abcdd5
Some very minor changes to decimal.py in Python 2.6, aimed
Mark Dickinson <dickinsm@gmail.com>
parents:
46643
diff
changeset
|
1565 raise OverflowError("Cannot convert infinity to int") |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1566 s = (-1)**self._sign |
|
34023
a8ff6ed856e8
SF bug #1071588 coercing decimal to int doesn't work between -1 and 1
Raymond Hettinger <python@rcn.com>
parents:
33851
diff
changeset
|
1567 if self._exp >= 0: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1568 return s*int(self._int)*10**self._exp |
|
34023
a8ff6ed856e8
SF bug #1071588 coercing decimal to int doesn't work between -1 and 1
Raymond Hettinger <python@rcn.com>
parents:
33851
diff
changeset
|
1569 else: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1570 return s*int(self._int[:self._exp] or '0') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1571 |
|
44923
e8efa62eec15
Add support for trunc().
Raymond Hettinger <python@rcn.com>
parents:
44701
diff
changeset
|
1572 __trunc__ = __int__ |
|
e8efa62eec15
Add support for trunc().
Raymond Hettinger <python@rcn.com>
parents:
44701
diff
changeset
|
1573 |
|
45293
4ca70663a79d
Bring decimal a bit closer to the spec for Reals.
Raymond Hettinger <python@rcn.com>
parents:
45269
diff
changeset
|
1574 def real(self): |
|
4ca70663a79d
Bring decimal a bit closer to the spec for Reals.
Raymond Hettinger <python@rcn.com>
parents:
45269
diff
changeset
|
1575 return self |
|
50598
09a498eb1820
More Python 2.3 compatibility fixes for decimal.py.
Mark Dickinson <dickinsm@gmail.com>
parents:
50595
diff
changeset
|
1576 real = property(real) |
|
09a498eb1820
More Python 2.3 compatibility fixes for decimal.py.
Mark Dickinson <dickinsm@gmail.com>
parents:
50595
diff
changeset
|
1577 |
|
45293
4ca70663a79d
Bring decimal a bit closer to the spec for Reals.
Raymond Hettinger <python@rcn.com>
parents:
45269
diff
changeset
|
1578 def imag(self): |
|
4ca70663a79d
Bring decimal a bit closer to the spec for Reals.
Raymond Hettinger <python@rcn.com>
parents:
45269
diff
changeset
|
1579 return Decimal(0) |
|
50598
09a498eb1820
More Python 2.3 compatibility fixes for decimal.py.
Mark Dickinson <dickinsm@gmail.com>
parents:
50595
diff
changeset
|
1580 imag = property(imag) |
|
45293
4ca70663a79d
Bring decimal a bit closer to the spec for Reals.
Raymond Hettinger <python@rcn.com>
parents:
45269
diff
changeset
|
1581 |
|
4ca70663a79d
Bring decimal a bit closer to the spec for Reals.
Raymond Hettinger <python@rcn.com>
parents:
45269
diff
changeset
|
1582 def conjugate(self): |
|
4ca70663a79d
Bring decimal a bit closer to the spec for Reals.
Raymond Hettinger <python@rcn.com>
parents:
45269
diff
changeset
|
1583 return self |
|
4ca70663a79d
Bring decimal a bit closer to the spec for Reals.
Raymond Hettinger <python@rcn.com>
parents:
45269
diff
changeset
|
1584 |
|
4ca70663a79d
Bring decimal a bit closer to the spec for Reals.
Raymond Hettinger <python@rcn.com>
parents:
45269
diff
changeset
|
1585 def __complex__(self): |
|
4ca70663a79d
Bring decimal a bit closer to the spec for Reals.
Raymond Hettinger <python@rcn.com>
parents:
45269
diff
changeset
|
1586 return complex(float(self)) |
|
4ca70663a79d
Bring decimal a bit closer to the spec for Reals.
Raymond Hettinger <python@rcn.com>
parents:
45269
diff
changeset
|
1587 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1588 def __long__(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1589 """Converts to a long. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
1590 |
|
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Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
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|
1591 Equivalent to long(int(self)) |
|
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Move Decimal from the sandbox into production.
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|
1592 """ |
|
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Move Decimal from the sandbox into production.
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|
1593 return long(self.__int__()) |
|
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Move Decimal from the sandbox into production.
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|
1594 |
|
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|
1595 def _fix_nan(self, context): |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1596 """Decapitate the payload of a NaN to fit the context""" |
|
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|
1597 payload = self._int |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1598 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1599 # maximum length of payload is precision if _clamp=0, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1600 # precision-1 if _clamp=1. |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1601 max_payload_len = context.prec - context._clamp |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1602 if len(payload) > max_payload_len: |
|
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Major change in the internal structure of the Decimal
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|
1603 payload = payload[len(payload)-max_payload_len:].lstrip('0') |
|
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|
1604 return _dec_from_triple(self._sign, payload, self._exp, True) |
|
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|
1605 return Decimal(self) |
|
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|
1606 |
| 33695 | 1607 def _fix(self, context): |
|
32451
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|
1608 """Round if it is necessary to keep self within prec precision. |
|
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Move Decimal from the sandbox into production.
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|
1609 |
|
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|
1610 Rounds and fixes the exponent. Does not raise on a sNaN. |
|
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Move Decimal from the sandbox into production.
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|
1611 |
|
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Move Decimal from the sandbox into production.
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|
1612 Arguments: |
|
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Move Decimal from the sandbox into production.
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|
1613 self - Decimal instance |
|
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Move Decimal from the sandbox into production.
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|
1614 context - context used. |
|
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Move Decimal from the sandbox into production.
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|
1615 """ |
|
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|
1616 |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
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|
1617 if self._is_special: |
|
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|
1618 if self._isnan(): |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1619 # decapitate payload if necessary |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1620 return self._fix_nan(context) |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1621 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1622 # self is +/-Infinity; return unaltered |
|
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|
1623 return Decimal(self) |
|
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|
1624 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1625 # if self is zero then exponent should be between Etiny and |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1626 # Emax if _clamp==0, and between Etiny and Etop if _clamp==1. |
|
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|
1627 Etiny = context.Etiny() |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1628 Etop = context.Etop() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1629 if not self: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1630 exp_max = [context.Emax, Etop][context._clamp] |
|
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|
1631 new_exp = min(max(self._exp, Etiny), exp_max) |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1632 if new_exp != self._exp: |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1633 context._raise_error(Clamped) |
|
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|
1634 return _dec_from_triple(self._sign, '0', new_exp) |
|
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|
1635 else: |
|
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8890be9386b7
The methods always return Decimal classes, even if they're
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|
1636 return Decimal(self) |
|
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|
1637 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1638 # exp_min is the smallest allowable exponent of the result, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1639 # equal to max(self.adjusted()-context.prec+1, Etiny) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1640 exp_min = len(self._int) + self._exp - context.prec |
|
63f3154c731d
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|
1641 if exp_min > Etop: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1642 # overflow: exp_min > Etop iff self.adjusted() > Emax |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1643 context._raise_error(Inexact) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1644 context._raise_error(Rounded) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1645 return context._raise_error(Overflow, 'above Emax', self._sign) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1646 self_is_subnormal = exp_min < Etiny |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1647 if self_is_subnormal: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1648 context._raise_error(Subnormal) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1649 exp_min = Etiny |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1650 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
1651 # round if self has too many digits |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1652 if self._exp < exp_min: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1653 context._raise_error(Rounded) |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
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diff
changeset
|
1654 digits = len(self._int) + self._exp - exp_min |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
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diff
changeset
|
1655 if digits < 0: |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
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diff
changeset
|
1656 self = _dec_from_triple(self._sign, '1', exp_min-1) |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
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diff
changeset
|
1657 digits = 0 |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
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parents:
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diff
changeset
|
1658 this_function = getattr(self, self._pick_rounding_function[context.rounding]) |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
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parents:
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diff
changeset
|
1659 changed = this_function(digits) |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1660 coeff = self._int[:digits] or '0' |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
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parents:
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diff
changeset
|
1661 if changed == 1: |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
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parents:
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diff
changeset
|
1662 coeff = str(int(coeff)+1) |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
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parents:
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diff
changeset
|
1663 ans = _dec_from_triple(self._sign, coeff, exp_min) |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
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diff
changeset
|
1664 |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
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diff
changeset
|
1665 if changed: |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1666 context._raise_error(Inexact) |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1667 if self_is_subnormal: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1668 context._raise_error(Underflow) |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
1669 if not ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1670 # raise Clamped on underflow to 0 |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
1671 context._raise_error(Clamped) |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1672 elif len(ans._int) == context.prec+1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1673 # we get here only if rescaling rounds the |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1674 # cofficient up to exactly 10**context.prec |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1675 if ans._exp < Etop: |
|
43993
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Major change in the internal structure of the Decimal
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|
1676 ans = _dec_from_triple(ans._sign, |
|
a4a140486691
Major change in the internal structure of the Decimal
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changeset
|
1677 ans._int[:-1], ans._exp+1) |
|
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|
1678 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1679 # Inexact and Rounded have already been raised |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1680 ans = context._raise_error(Overflow, 'above Emax', |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1681 self._sign) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1682 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1683 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1684 # fold down if _clamp == 1 and self has too few digits |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1685 if context._clamp == 1 and self._exp > Etop: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1686 context._raise_error(Clamped) |
|
43993
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Major change in the internal structure of the Decimal
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changeset
|
1687 self_padded = self._int + '0'*(self._exp - Etop) |
|
a4a140486691
Major change in the internal structure of the Decimal
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changeset
|
1688 return _dec_from_triple(self._sign, self_padded, Etop) |
|
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changeset
|
1689 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1690 # here self was representable to begin with; return unchanged |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
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parents:
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changeset
|
1691 return Decimal(self) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1692 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1693 _pick_rounding_function = {} |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1694 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1695 # for each of the rounding functions below: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1696 # self is a finite, nonzero Decimal |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1697 # prec is an integer satisfying 0 <= prec < len(self._int) |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1698 # |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1699 # each function returns either -1, 0, or 1, as follows: |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1700 # 1 indicates that self should be rounded up (away from zero) |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1701 # 0 indicates that self should be truncated, and that all the |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1702 # digits to be truncated are zeros (so the value is unchanged) |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1703 # -1 indicates that there are nonzero digits to be truncated |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1704 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1705 def _round_down(self, prec): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1706 """Also known as round-towards-0, truncate.""" |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1707 if _all_zeros(self._int, prec): |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1708 return 0 |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1709 else: |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1710 return -1 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1711 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1712 def _round_up(self, prec): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1713 """Rounds away from 0.""" |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1714 return -self._round_down(prec) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1715 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1716 def _round_half_up(self, prec): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1717 """Rounds 5 up (away from 0)""" |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
1718 if self._int[prec] in '56789': |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1719 return 1 |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1720 elif _all_zeros(self._int, prec): |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1721 return 0 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1722 else: |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1723 return -1 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1724 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1725 def _round_half_down(self, prec): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1726 """Round 5 down""" |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1727 if _exact_half(self._int, prec): |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1728 return -1 |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1729 else: |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1730 return self._round_half_up(prec) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1731 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1732 def _round_half_even(self, prec): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1733 """Round 5 to even, rest to nearest.""" |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1734 if _exact_half(self._int, prec) and \ |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1735 (prec == 0 or self._int[prec-1] in '02468'): |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1736 return -1 |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1737 else: |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1738 return self._round_half_up(prec) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1739 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1740 def _round_ceiling(self, prec): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1741 """Rounds up (not away from 0 if negative.)""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1742 if self._sign: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1743 return self._round_down(prec) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1744 else: |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1745 return -self._round_down(prec) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1746 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1747 def _round_floor(self, prec): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1748 """Rounds down (not towards 0 if negative)""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1749 if not self._sign: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1750 return self._round_down(prec) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1751 else: |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1752 return -self._round_down(prec) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1753 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1754 def _round_05up(self, prec): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1755 """Round down unless digit prec-1 is 0 or 5.""" |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1756 if prec and self._int[prec-1] not in '05': |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1757 return self._round_down(prec) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1758 else: |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
1759 return -self._round_down(prec) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1760 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1761 def fma(self, other, third, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1762 """Fused multiply-add. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1763 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1764 Returns self*other+third with no rounding of the intermediate |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1765 product self*other. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1766 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1767 self and other are multiplied together, with no rounding of |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1768 the result. The third operand is then added to the result, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1769 and a single final rounding is performed. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1770 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1771 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1772 other = _convert_other(other, raiseit=True) |
|
44148
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1773 |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1774 # compute product; raise InvalidOperation if either operand is |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1775 # a signaling NaN or if the product is zero times infinity. |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1776 if self._is_special or other._is_special: |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1777 if context is None: |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1778 context = getcontext() |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1779 if self._exp == 'N': |
|
44352
f7bc79112bcf
Some minor cleanups. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44328
diff
changeset
|
1780 return context._raise_error(InvalidOperation, 'sNaN', self) |
|
44148
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1781 if other._exp == 'N': |
|
44352
f7bc79112bcf
Some minor cleanups. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44328
diff
changeset
|
1782 return context._raise_error(InvalidOperation, 'sNaN', other) |
|
44148
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1783 if self._exp == 'n': |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1784 product = self |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1785 elif other._exp == 'n': |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1786 product = other |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1787 elif self._exp == 'F': |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1788 if not other: |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
1789 return context._raise_error(InvalidOperation, |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1790 'INF * 0 in fma') |
| 50497 | 1791 product = _SignedInfinity[self._sign ^ other._sign] |
|
44148
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1792 elif other._exp == 'F': |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1793 if not self: |
|
53320d544bc7
fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44121
diff
changeset
|
1794 return context._raise_error(InvalidOperation, |
|
53320d544bc7
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1795 '0 * INF in fma') |
| 50497 | 1796 product = _SignedInfinity[self._sign ^ other._sign] |
|
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1797 else: |
|
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fma speedup by avoiding to create a Context. Thanks Mark Dickinson.
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1798 product = _dec_from_triple(self._sign ^ other._sign, |
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|
1799 str(int(self._int) * int(other._int)), |
|
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|
1800 self._exp + other._exp) |
|
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1801 |
|
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1802 third = _convert_other(third, raiseit=True) |
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1803 return product.__add__(third, context) |
|
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1804 |
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1805 def _power_modulo(self, other, modulo, context=None): |
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1806 """Three argument version of __pow__""" |
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1807 |
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1808 # if can't convert other and modulo to Decimal, raise |
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1809 # TypeError; there's no point returning NotImplemented (no |
|
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1810 # equivalent of __rpow__ for three argument pow) |
|
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1811 other = _convert_other(other, raiseit=True) |
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1812 modulo = _convert_other(modulo, raiseit=True) |
|
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1813 |
|
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1814 if context is None: |
|
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1815 context = getcontext() |
|
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1816 |
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1817 # deal with NaNs: if there are any sNaNs then first one wins, |
|
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1818 # (i.e. behaviour for NaNs is identical to that of fma) |
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1819 self_is_nan = self._isnan() |
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1820 other_is_nan = other._isnan() |
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1821 modulo_is_nan = modulo._isnan() |
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1822 if self_is_nan or other_is_nan or modulo_is_nan: |
|
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1823 if self_is_nan == 2: |
|
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1824 return context._raise_error(InvalidOperation, 'sNaN', |
|
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1825 self) |
|
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1826 if other_is_nan == 2: |
|
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1827 return context._raise_error(InvalidOperation, 'sNaN', |
|
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1828 other) |
|
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1829 if modulo_is_nan == 2: |
|
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1830 return context._raise_error(InvalidOperation, 'sNaN', |
|
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|
1831 modulo) |
|
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1832 if self_is_nan: |
|
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1833 return self._fix_nan(context) |
|
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1834 if other_is_nan: |
|
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1835 return other._fix_nan(context) |
|
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1836 return modulo._fix_nan(context) |
|
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1837 |
|
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1838 # check inputs: we apply same restrictions as Python's pow() |
|
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1839 if not (self._isinteger() and |
|
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1840 other._isinteger() and |
|
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1841 modulo._isinteger()): |
|
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1842 return context._raise_error(InvalidOperation, |
|
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1843 'pow() 3rd argument not allowed ' |
|
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1844 'unless all arguments are integers') |
|
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1845 if other < 0: |
|
63f3154c731d
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1846 return context._raise_error(InvalidOperation, |
|
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1847 'pow() 2nd argument cannot be ' |
|
63f3154c731d
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|
1848 'negative when 3rd argument specified') |
|
63f3154c731d
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1849 if not modulo: |
|
63f3154c731d
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1850 return context._raise_error(InvalidOperation, |
|
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|
1851 'pow() 3rd argument cannot be 0') |
|
63f3154c731d
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|
1852 |
|
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|
1853 # additional restriction for decimal: the modulus must be less |
|
63f3154c731d
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|
1854 # than 10**prec in absolute value |
|
63f3154c731d
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|
1855 if modulo.adjusted() >= context.prec: |
|
63f3154c731d
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|
1856 return context._raise_error(InvalidOperation, |
|
63f3154c731d
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|
1857 'insufficient precision: pow() 3rd ' |
|
63f3154c731d
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|
1858 'argument must not have more than ' |
|
63f3154c731d
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|
1859 'precision digits') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1860 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1861 # define 0**0 == NaN, for consistency with two-argument pow |
|
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|
1862 # (even though it hurts!) |
|
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|
1863 if not other and not self: |
|
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|
1864 return context._raise_error(InvalidOperation, |
|
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|
1865 'at least one of pow() 1st argument ' |
|
63f3154c731d
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|
1866 'and 2nd argument must be nonzero ;' |
|
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|
1867 '0**0 is not defined') |
|
63f3154c731d
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|
1868 |
|
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|
1869 # compute sign of result |
|
63f3154c731d
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|
1870 if other._iseven(): |
|
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|
1871 sign = 0 |
|
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1872 else: |
|
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|
1873 sign = self._sign |
|
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|
1874 |
|
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|
1875 # convert modulo to a Python integer, and self and other to |
|
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1876 # Decimal integers (i.e. force their exponents to be >= 0) |
|
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|
1877 modulo = abs(int(modulo)) |
|
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1878 base = _WorkRep(self.to_integral_value()) |
|
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|
1879 exponent = _WorkRep(other.to_integral_value()) |
|
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|
1880 |
|
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|
1881 # compute result using integer pow() |
|
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|
1882 base = (base.int % modulo * pow(10, base.exp, modulo)) % modulo |
|
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|
1883 for i in xrange(exponent.exp): |
|
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|
1884 base = pow(base, 10, modulo) |
|
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|
1885 base = pow(base, exponent.int, modulo) |
|
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|
1886 |
|
43993
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Major change in the internal structure of the Decimal
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|
1887 return _dec_from_triple(sign, str(base), 0) |
|
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|
1888 |
|
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|
1889 def _power_exact(self, other, p): |
|
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|
1890 """Attempt to compute self**other exactly. |
|
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|
1891 |
|
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|
1892 Given Decimals self and other and an integer p, attempt to |
|
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|
1893 compute an exact result for the power self**other, with p |
|
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|
1894 digits of precision. Return None if self**other is not |
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1895 exactly representable in p digits. |
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1896 |
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1897 Assumes that elimination of special cases has already been |
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1898 performed: self and other must both be nonspecial; self must |
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1899 be positive and not numerically equal to 1; other must be |
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1900 nonzero. For efficiency, other._exp should not be too large, |
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1901 so that 10**abs(other._exp) is a feasible calculation.""" |
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1902 |
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1903 # In the comments below, we write x for the value of self and |
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1904 # y for the value of other. Write x = xc*10**xe and y = |
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1905 # yc*10**ye. |
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1906 |
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1907 # The main purpose of this method is to identify the *failure* |
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1908 # of x**y to be exactly representable with as little effort as |
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1909 # possible. So we look for cheap and easy tests that |
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1910 # eliminate the possibility of x**y being exact. Only if all |
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1911 # these tests are passed do we go on to actually compute x**y. |
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1912 |
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1913 # Here's the main idea. First normalize both x and y. We |
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1914 # express y as a rational m/n, with m and n relatively prime |
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1915 # and n>0. Then for x**y to be exactly representable (at |
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1916 # *any* precision), xc must be the nth power of a positive |
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1917 # integer and xe must be divisible by n. If m is negative |
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1918 # then additionally xc must be a power of either 2 or 5, hence |
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1919 # a power of 2**n or 5**n. |
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1920 # |
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1921 # There's a limit to how small |y| can be: if y=m/n as above |
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1922 # then: |
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1923 # |
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1924 # (1) if xc != 1 then for the result to be representable we |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1925 # need xc**(1/n) >= 2, and hence also xc**|y| >= 2. So |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1926 # if |y| <= 1/nbits(xc) then xc < 2**nbits(xc) <= |
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1927 # 2**(1/|y|), hence xc**|y| < 2 and the result is not |
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1928 # representable. |
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1929 # |
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1930 # (2) if xe != 0, |xe|*(1/n) >= 1, so |xe|*|y| >= 1. Hence if |
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1931 # |y| < 1/|xe| then the result is not representable. |
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1932 # |
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1933 # Note that since x is not equal to 1, at least one of (1) and |
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1934 # (2) must apply. Now |y| < 1/nbits(xc) iff |yc|*nbits(xc) < |
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1935 # 10**-ye iff len(str(|yc|*nbits(xc)) <= -ye. |
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1936 # |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1937 # There's also a limit to how large y can be, at least if it's |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1938 # positive: the normalized result will have coefficient xc**y, |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1939 # so if it's representable then xc**y < 10**p, and y < |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1940 # p/log10(xc). Hence if y*log10(xc) >= p then the result is |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1941 # not exactly representable. |
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1942 |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1943 # if len(str(abs(yc*xe)) <= -ye then abs(yc*xe) < 10**-ye, |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1944 # so |y| < 1/xe and the result is not representable. |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1945 # Similarly, len(str(abs(yc)*xc_bits)) <= -ye implies |y| |
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1946 # < 1/nbits(xc). |
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1947 |
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1948 x = _WorkRep(self) |
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1949 xc, xe = x.int, x.exp |
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1950 while xc % 10 == 0: |
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1951 xc //= 10 |
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1952 xe += 1 |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1953 |
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1954 y = _WorkRep(other) |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1955 yc, ye = y.int, y.exp |
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1956 while yc % 10 == 0: |
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1957 yc //= 10 |
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1958 ye += 1 |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1959 |
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1960 # case where xc == 1: result is 10**(xe*y), with xe*y |
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1961 # required to be an integer |
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1962 if xc == 1: |
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1963 if ye >= 0: |
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1964 exponent = xe*yc*10**ye |
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1965 else: |
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1966 exponent, remainder = divmod(xe*yc, 10**-ye) |
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1967 if remainder: |
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1968 return None |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1969 if y.sign == 1: |
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1970 exponent = -exponent |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1971 # if other is a nonnegative integer, use ideal exponent |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1972 if other._isinteger() and other._sign == 0: |
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1973 ideal_exponent = self._exp*int(other) |
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1974 zeros = min(exponent-ideal_exponent, p-1) |
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1975 else: |
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1976 zeros = 0 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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1977 return _dec_from_triple(0, '1' + '0'*zeros, exponent-zeros) |
|
43360
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1978 |
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1979 # case where y is negative: xc must be either a power |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
1980 # of 2 or a power of 5. |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1981 if y.sign == 1: |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1982 last_digit = xc % 10 |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1983 if last_digit in (2,4,6,8): |
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1984 # quick test for power of 2 |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1985 if xc & -xc != xc: |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1986 return None |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1987 # now xc is a power of 2; e is its exponent |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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1988 e = _nbits(xc)-1 |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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|
1989 # find e*y and xe*y; both must be integers |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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42605
diff
changeset
|
1990 if ye >= 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1991 y_as_int = yc*10**ye |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1992 e = e*y_as_int |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1993 xe = xe*y_as_int |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1994 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1995 ten_pow = 10**-ye |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1996 e, remainder = divmod(e*yc, ten_pow) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1997 if remainder: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1998 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
1999 xe, remainder = divmod(xe*yc, ten_pow) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2000 if remainder: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2001 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2002 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2003 if e*65 >= p*93: # 93/65 > log(10)/log(5) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2004 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2005 xc = 5**e |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2006 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2007 elif last_digit == 5: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2008 # e >= log_5(xc) if xc is a power of 5; we have |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2009 # equality all the way up to xc=5**2658 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2010 e = _nbits(xc)*28//65 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2011 xc, remainder = divmod(5**e, xc) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2012 if remainder: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2013 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2014 while xc % 5 == 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2015 xc //= 5 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2016 e -= 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2017 if ye >= 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2018 y_as_integer = yc*10**ye |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2019 e = e*y_as_integer |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2020 xe = xe*y_as_integer |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2021 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2022 ten_pow = 10**-ye |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2023 e, remainder = divmod(e*yc, ten_pow) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2024 if remainder: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2025 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2026 xe, remainder = divmod(xe*yc, ten_pow) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2027 if remainder: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2028 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2029 if e*3 >= p*10: # 10/3 > log(10)/log(2) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2030 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2031 xc = 2**e |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2032 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2033 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2034 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2035 if xc >= 10**p: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2036 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2037 xe = -e-xe |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2038 return _dec_from_triple(0, str(xc), xe) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2039 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2040 # now y is positive; find m and n such that y = m/n |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2041 if ye >= 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2042 m, n = yc*10**ye, 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2043 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2044 if xe != 0 and len(str(abs(yc*xe))) <= -ye: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2045 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2046 xc_bits = _nbits(xc) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2047 if xc != 1 and len(str(abs(yc)*xc_bits)) <= -ye: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2048 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2049 m, n = yc, 10**(-ye) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2050 while m % 2 == n % 2 == 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2051 m //= 2 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2052 n //= 2 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2053 while m % 5 == n % 5 == 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2054 m //= 5 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2055 n //= 5 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2056 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2057 # compute nth root of xc*10**xe |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2058 if n > 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2059 # if 1 < xc < 2**n then xc isn't an nth power |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2060 if xc != 1 and xc_bits <= n: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2061 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2062 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2063 xe, rem = divmod(xe, n) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2064 if rem != 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2065 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2066 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2067 # compute nth root of xc using Newton's method |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2068 a = 1L << -(-_nbits(xc)//n) # initial estimate |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2069 while True: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2070 q, r = divmod(xc, a**(n-1)) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2071 if a <= q: |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2072 break |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2073 else: |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2074 a = (a*(n-1) + q)//n |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2075 if not (a == q and r == 0): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2076 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2077 xc = a |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2078 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2079 # now xc*10**xe is the nth root of the original xc*10**xe |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2080 # compute mth power of xc*10**xe |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2081 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2082 # if m > p*100//_log10_lb(xc) then m > p/log10(xc), hence xc**m > |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2083 # 10**p and the result is not representable. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2084 if xc > 1 and m > p*100//_log10_lb(xc): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2085 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2086 xc = xc**m |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2087 xe *= m |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2088 if xc > 10**p: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2089 return None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2090 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2091 # by this point the result *is* exactly representable |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2092 # adjust the exponent to get as close as possible to the ideal |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2093 # exponent, if necessary |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2094 str_xc = str(xc) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2095 if other._isinteger() and other._sign == 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2096 ideal_exponent = self._exp*int(other) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2097 zeros = min(xe-ideal_exponent, p-len(str_xc)) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2098 else: |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2099 zeros = 0 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2100 return _dec_from_triple(0, str_xc+'0'*zeros, xe-zeros) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2101 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2102 def __pow__(self, other, modulo=None, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2103 """Return self ** other [ % modulo]. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2104 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2105 With two arguments, compute self**other. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2106 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2107 With three arguments, compute (self**other) % modulo. For the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2108 three argument form, the following restrictions on the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2109 arguments hold: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2110 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2111 - all three arguments must be integral |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2112 - other must be nonnegative |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2113 - either self or other (or both) must be nonzero |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2114 - modulo must be nonzero and must have at most p digits, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2115 where p is the context precision. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2116 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2117 If any of these restrictions is violated the InvalidOperation |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2118 flag is raised. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2119 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2120 The result of pow(self, other, modulo) is identical to the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2121 result that would be obtained by computing (self**other) % |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2122 modulo with unbounded precision, but is computed more |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2123 efficiently. It is always exact. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2124 """ |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2125 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2126 if modulo is not None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2127 return self._power_modulo(other, modulo, context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2128 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2129 other = _convert_other(other) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2130 if other is NotImplemented: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2131 return other |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2132 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2133 if context is None: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2134 context = getcontext() |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2135 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2136 # either argument is a NaN => result is NaN |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2137 ans = self._check_nans(other, context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2138 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2139 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2140 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2141 # 0**0 = NaN (!), x**0 = 1 for nonzero x (including +/-Infinity) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2142 if not other: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2143 if not self: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2144 return context._raise_error(InvalidOperation, '0 ** 0') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2145 else: |
| 50497 | 2146 return _One |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2147 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2148 # result has sign 1 iff self._sign is 1 and other is an odd integer |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2149 result_sign = 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2150 if self._sign == 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2151 if other._isinteger(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2152 if not other._iseven(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2153 result_sign = 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2154 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2155 # -ve**noninteger = NaN |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2156 # (-0)**noninteger = 0**noninteger |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2157 if self: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2158 return context._raise_error(InvalidOperation, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2159 'x ** y with x negative and y not an integer') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2160 # negate self, without doing any unwanted rounding |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2161 self = self.copy_negate() |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2162 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2163 # 0**(+ve or Inf)= 0; 0**(-ve or -Inf) = Infinity |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2164 if not self: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2165 if other._sign == 0: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2166 return _dec_from_triple(result_sign, '0', 0) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2167 else: |
| 50497 | 2168 return _SignedInfinity[result_sign] |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2169 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2170 # Inf**(+ve or Inf) = Inf; Inf**(-ve or -Inf) = 0 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2171 if self._isinfinity(): |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2172 if other._sign == 0: |
| 50497 | 2173 return _SignedInfinity[result_sign] |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2174 else: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2175 return _dec_from_triple(result_sign, '0', 0) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2176 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2177 # 1**other = 1, but the choice of exponent and the flags |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2178 # depend on the exponent of self, and on whether other is a |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2179 # positive integer, a negative integer, or neither |
| 50497 | 2180 if self == _One: |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2181 if other._isinteger(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2182 # exp = max(self._exp*max(int(other), 0), |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2183 # 1-context.prec) but evaluating int(other) directly |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2184 # is dangerous until we know other is small (other |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2185 # could be 1e999999999) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2186 if other._sign == 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2187 multiplier = 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2188 elif other > context.prec: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2189 multiplier = context.prec |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2190 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2191 multiplier = int(other) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2192 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2193 exp = self._exp * multiplier |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2194 if exp < 1-context.prec: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2195 exp = 1-context.prec |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2196 context._raise_error(Rounded) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2197 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2198 context._raise_error(Inexact) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2199 context._raise_error(Rounded) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2200 exp = 1-context.prec |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2201 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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diff
changeset
|
2202 return _dec_from_triple(result_sign, '1'+'0'*-exp, exp) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2203 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2204 # compute adjusted exponent of self |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2205 self_adj = self.adjusted() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2206 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2207 # self ** infinity is infinity if self > 1, 0 if self < 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2208 # self ** -infinity is infinity if self < 1, 0 if self > 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2209 if other._isinfinity(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2210 if (other._sign == 0) == (self_adj < 0): |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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parents:
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diff
changeset
|
2211 return _dec_from_triple(result_sign, '0', 0) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2212 else: |
| 50497 | 2213 return _SignedInfinity[result_sign] |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2214 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2215 # from here on, the result always goes through the call |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2216 # to _fix at the end of this function. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2217 ans = None |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2218 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2219 # crude test to catch cases of extreme overflow/underflow. If |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2220 # log10(self)*other >= 10**bound and bound >= len(str(Emax)) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2221 # then 10**bound >= 10**len(str(Emax)) >= Emax+1 and hence |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2222 # self**other >= 10**(Emax+1), so overflow occurs. The test |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2223 # for underflow is similar. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2224 bound = self._log10_exp_bound() + other.adjusted() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2225 if (self_adj >= 0) == (other._sign == 0): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2226 # self > 1 and other +ve, or self < 1 and other -ve |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2227 # possibility of overflow |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2228 if bound >= len(str(context.Emax)): |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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parents:
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diff
changeset
|
2229 ans = _dec_from_triple(result_sign, '1', context.Emax+1) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2230 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2231 # self > 1 and other -ve, or self < 1 and other +ve |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2232 # possibility of underflow to 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2233 Etiny = context.Etiny() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2234 if bound >= len(str(-Etiny)): |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2235 ans = _dec_from_triple(result_sign, '1', Etiny-1) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2236 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2237 # try for an exact result with precision +1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2238 if ans is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2239 ans = self._power_exact(other, context.prec + 1) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2240 if ans is not None and result_sign == 1: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2241 ans = _dec_from_triple(1, ans._int, ans._exp) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2242 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2243 # usual case: inexact result, x**y computed directly as exp(y*log(x)) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2244 if ans is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2245 p = context.prec |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2246 x = _WorkRep(self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2247 xc, xe = x.int, x.exp |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2248 y = _WorkRep(other) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2249 yc, ye = y.int, y.exp |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2250 if y.sign == 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2251 yc = -yc |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2252 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2253 # compute correctly rounded result: start with precision +3, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2254 # then increase precision until result is unambiguously roundable |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2255 extra = 3 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2256 while True: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2257 coeff, exp = _dpower(xc, xe, yc, ye, p+extra) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2258 if coeff % (5*10**(len(str(coeff))-p-1)): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2259 break |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2260 extra += 3 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2261 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2262 ans = _dec_from_triple(result_sign, str(coeff), exp) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2263 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2264 # the specification says that for non-integer other we need to |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2265 # raise Inexact, even when the result is actually exact. In |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2266 # the same way, we need to raise Underflow here if the result |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2267 # is subnormal. (The call to _fix will take care of raising |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2268 # Rounded and Subnormal, as usual.) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2269 if not other._isinteger(): |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2270 context._raise_error(Inexact) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2271 # pad with zeros up to length context.prec+1 if necessary |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2272 if len(ans._int) <= context.prec: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2273 expdiff = context.prec+1 - len(ans._int) |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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parents:
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diff
changeset
|
2274 ans = _dec_from_triple(ans._sign, ans._int+'0'*expdiff, |
|
a4a140486691
Major change in the internal structure of the Decimal
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parents:
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diff
changeset
|
2275 ans._exp-expdiff) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2276 if ans.adjusted() < context.Emin: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2277 context._raise_error(Underflow) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2278 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2279 # unlike exp, ln and log10, the power function respects the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2280 # rounding mode; no need to use ROUND_HALF_EVEN here |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
2281 ans = ans._fix(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2282 return ans |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2283 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2284 def __rpow__(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2285 """Swaps self/other and returns __pow__.""" |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2286 other = _convert_other(other) |
|
34812
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
2287 if other is NotImplemented: |
|
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
2288 return other |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2289 return other.__pow__(self, context=context) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2290 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2291 def normalize(self, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2292 """Normalize- strip trailing 0s, change anything equal to 0 to 0e0""" |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
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|
2293 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2294 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2295 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2296 |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
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diff
changeset
|
2297 if self._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
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diff
changeset
|
2298 ans = self._check_nans(context=context) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
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diff
changeset
|
2299 if ans: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2300 return ans |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2301 |
| 33695 | 2302 dup = self._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2303 if dup._isinfinity(): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2304 return dup |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2305 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2306 if not dup: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2307 return _dec_from_triple(dup._sign, '0', 0) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2308 exp_max = [context.Emax, context.Etop()][context._clamp] |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2309 end = len(dup._int) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2310 exp = dup._exp |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2311 while dup._int[end-1] == '0' and exp < exp_max: |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2312 exp += 1 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2313 end -= 1 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2314 return _dec_from_triple(dup._sign, dup._int[:end], exp) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2315 |
|
43362
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
Facundo Batista <facundobatista@gmail.com>
parents:
43360
diff
changeset
|
2316 def quantize(self, exp, rounding=None, context=None, watchexp=True): |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2317 """Quantize self so its exponent is the same as that of exp. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2318 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2319 Similar to self._rescale(exp._exp) but with error checking. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2320 """ |
|
43362
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2321 exp = _convert_other(exp, raiseit=True) |
|
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
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parents:
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diff
changeset
|
2322 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2323 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2324 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2325 if rounding is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2326 rounding = context.rounding |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2327 |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2328 if self._is_special or exp._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2329 ans = self._check_nans(exp, context) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2330 if ans: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2331 return ans |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2332 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2333 if exp._isinfinity() or self._isinfinity(): |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2334 if exp._isinfinity() and self._isinfinity(): |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
2335 return Decimal(self) # if both are inf, it is OK |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2336 return context._raise_error(InvalidOperation, |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2337 'quantize with one INF') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2338 |
|
43362
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
Facundo Batista <facundobatista@gmail.com>
parents:
43360
diff
changeset
|
2339 # if we're not watching exponents, do a simple rescale |
|
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
Facundo Batista <facundobatista@gmail.com>
parents:
43360
diff
changeset
|
2340 if not watchexp: |
|
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
Facundo Batista <facundobatista@gmail.com>
parents:
43360
diff
changeset
|
2341 ans = self._rescale(exp._exp, rounding) |
|
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
Facundo Batista <facundobatista@gmail.com>
parents:
43360
diff
changeset
|
2342 # raise Inexact and Rounded where appropriate |
|
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
Facundo Batista <facundobatista@gmail.com>
parents:
43360
diff
changeset
|
2343 if ans._exp > self._exp: |
|
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
Facundo Batista <facundobatista@gmail.com>
parents:
43360
diff
changeset
|
2344 context._raise_error(Rounded) |
|
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
Facundo Batista <facundobatista@gmail.com>
parents:
43360
diff
changeset
|
2345 if ans != self: |
|
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
Facundo Batista <facundobatista@gmail.com>
parents:
43360
diff
changeset
|
2346 context._raise_error(Inexact) |
|
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
Facundo Batista <facundobatista@gmail.com>
parents:
43360
diff
changeset
|
2347 return ans |
|
c8c7a947a641
Put the parameter watchexp back in (changed watchexp from an int
Facundo Batista <facundobatista@gmail.com>
parents:
43360
diff
changeset
|
2348 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2349 # exp._exp should be between Etiny and Emax |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2350 if not (context.Etiny() <= exp._exp <= context.Emax): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2351 return context._raise_error(InvalidOperation, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2352 'target exponent out of bounds in quantize') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2353 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2354 if not self: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2355 ans = _dec_from_triple(self._sign, '0', exp._exp) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2356 return ans._fix(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2357 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2358 self_adjusted = self.adjusted() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2359 if self_adjusted > context.Emax: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2360 return context._raise_error(InvalidOperation, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2361 'exponent of quantize result too large for current context') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2362 if self_adjusted - exp._exp + 1 > context.prec: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2363 return context._raise_error(InvalidOperation, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2364 'quantize result has too many digits for current context') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2365 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2366 ans = self._rescale(exp._exp, rounding) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2367 if ans.adjusted() > context.Emax: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2368 return context._raise_error(InvalidOperation, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2369 'exponent of quantize result too large for current context') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2370 if len(ans._int) > context.prec: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2371 return context._raise_error(InvalidOperation, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2372 'quantize result has too many digits for current context') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2373 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2374 # raise appropriate flags |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2375 if ans._exp > self._exp: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2376 context._raise_error(Rounded) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2377 if ans != self: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2378 context._raise_error(Inexact) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2379 if ans and ans.adjusted() < context.Emin: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2380 context._raise_error(Subnormal) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2381 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2382 # call to fix takes care of any necessary folddown |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2383 ans = ans._fix(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2384 return ans |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2385 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2386 def same_quantum(self, other): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2387 """Return True if self and other have the same exponent; otherwise |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2388 return False. |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2389 |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2390 If either operand is a special value, the following rules are used: |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2391 * return True if both operands are infinities |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2392 * return True if both operands are NaNs |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2393 * otherwise, return False. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2394 """ |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2395 other = _convert_other(other, raiseit=True) |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2396 if self._is_special or other._is_special: |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2397 return (self.is_nan() and other.is_nan() or |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2398 self.is_infinite() and other.is_infinite()) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2399 return self._exp == other._exp |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2400 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2401 def _rescale(self, exp, rounding): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2402 """Rescale self so that the exponent is exp, either by padding with zeros |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2403 or by truncating digits, using the given rounding mode. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2404 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2405 Specials are returned without change. This operation is |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2406 quiet: it raises no flags, and uses no information from the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2407 context. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2408 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2409 exp = exp to scale to (an integer) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2410 rounding = rounding mode |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2411 """ |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2412 if self._is_special: |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
2413 return Decimal(self) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2414 if not self: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2415 return _dec_from_triple(self._sign, '0', exp) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2416 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2417 if self._exp >= exp: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2418 # pad answer with zeros if necessary |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2419 return _dec_from_triple(self._sign, |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2420 self._int + '0'*(self._exp - exp), exp) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2421 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2422 # too many digits; round and lose data. If self.adjusted() < |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2423 # exp-1, replace self by 10**(exp-1) before rounding |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2424 digits = len(self._int) + self._exp - exp |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2425 if digits < 0: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2426 self = _dec_from_triple(self._sign, '1', exp-1) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2427 digits = 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2428 this_function = getattr(self, self._pick_rounding_function[rounding]) |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
2429 changed = this_function(digits) |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
2430 coeff = self._int[:digits] or '0' |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
2431 if changed == 1: |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
2432 coeff = str(int(coeff)+1) |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
2433 return _dec_from_triple(self._sign, coeff, exp) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2434 |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2435 def _round(self, places, rounding): |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2436 """Round a nonzero, nonspecial Decimal to a fixed number of |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2437 significant figures, using the given rounding mode. |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2438 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2439 Infinities, NaNs and zeros are returned unaltered. |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2440 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2441 This operation is quiet: it raises no flags, and uses no |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2442 information from the context. |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2443 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2444 """ |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2445 if places <= 0: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2446 raise ValueError("argument should be at least 1 in _round") |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2447 if self._is_special or not self: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2448 return Decimal(self) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2449 ans = self._rescale(self.adjusted()+1-places, rounding) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2450 # it can happen that the rescale alters the adjusted exponent; |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2451 # for example when rounding 99.97 to 3 significant figures. |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2452 # When this happens we end up with an extra 0 at the end of |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2453 # the number; a second rescale fixes this. |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2454 if ans.adjusted() != self.adjusted(): |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2455 ans = ans._rescale(ans.adjusted()+1-places, rounding) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2456 return ans |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
2457 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2458 def to_integral_exact(self, rounding=None, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2459 """Rounds to a nearby integer. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2460 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2461 If no rounding mode is specified, take the rounding mode from |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2462 the context. This method raises the Rounded and Inexact flags |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2463 when appropriate. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2464 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2465 See also: to_integral_value, which does exactly the same as |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2466 this method except that it doesn't raise Inexact or Rounded. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2467 """ |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2468 if self._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2469 ans = self._check_nans(context=context) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2470 if ans: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2471 return ans |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
2472 return Decimal(self) |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2473 if self._exp >= 0: |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
2474 return Decimal(self) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2475 if not self: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2476 return _dec_from_triple(self._sign, '0', 0) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2477 if context is None: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2478 context = getcontext() |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2479 if rounding is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2480 rounding = context.rounding |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2481 context._raise_error(Rounded) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2482 ans = self._rescale(0, rounding) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2483 if ans != self: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2484 context._raise_error(Inexact) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2485 return ans |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2486 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2487 def to_integral_value(self, rounding=None, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2488 """Rounds to the nearest integer, without raising inexact, rounded.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2489 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2490 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2491 if rounding is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2492 rounding = context.rounding |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2493 if self._is_special: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2494 ans = self._check_nans(context=context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2495 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2496 return ans |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
2497 return Decimal(self) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2498 if self._exp >= 0: |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
2499 return Decimal(self) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2500 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2501 return self._rescale(0, rounding) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2502 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2503 # the method name changed, but we provide also the old one, for compatibility |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2504 to_integral = to_integral_value |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2505 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2506 def sqrt(self, context=None): |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2507 """Return the square root of self.""" |
|
46082
22bd02293efa
Issue #2478: Decimal(sqrt(0)) failed when the decimal context
Mark Dickinson <dickinsm@gmail.com>
parents:
45568
diff
changeset
|
2508 if context is None: |
|
22bd02293efa
Issue #2478: Decimal(sqrt(0)) failed when the decimal context
Mark Dickinson <dickinsm@gmail.com>
parents:
45568
diff
changeset
|
2509 context = getcontext() |
|
22bd02293efa
Issue #2478: Decimal(sqrt(0)) failed when the decimal context
Mark Dickinson <dickinsm@gmail.com>
parents:
45568
diff
changeset
|
2510 |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2511 if self._is_special: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2512 ans = self._check_nans(context=context) |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2513 if ans: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2514 return ans |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2515 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2516 if self._isinfinity() and self._sign == 0: |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2517 return Decimal(self) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2518 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2519 if not self: |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2520 # exponent = self._exp // 2. sqrt(-0) = -0 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2521 ans = _dec_from_triple(self._sign, '0', self._exp // 2) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2522 return ans._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2523 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2524 if self._sign == 1: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2525 return context._raise_error(InvalidOperation, 'sqrt(-x), x > 0') |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2526 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2527 # At this point self represents a positive number. Let p be |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2528 # the desired precision and express self in the form c*100**e |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2529 # with c a positive real number and e an integer, c and e |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2530 # being chosen so that 100**(p-1) <= c < 100**p. Then the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2531 # (exact) square root of self is sqrt(c)*10**e, and 10**(p-1) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2532 # <= sqrt(c) < 10**p, so the closest representable Decimal at |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2533 # precision p is n*10**e where n = round_half_even(sqrt(c)), |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2534 # the closest integer to sqrt(c) with the even integer chosen |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2535 # in the case of a tie. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2536 # |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2537 # To ensure correct rounding in all cases, we use the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2538 # following trick: we compute the square root to an extra |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2539 # place (precision p+1 instead of precision p), rounding down. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2540 # Then, if the result is inexact and its last digit is 0 or 5, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2541 # we increase the last digit to 1 or 6 respectively; if it's |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2542 # exact we leave the last digit alone. Now the final round to |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2543 # p places (or fewer in the case of underflow) will round |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2544 # correctly and raise the appropriate flags. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2545 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2546 # use an extra digit of precision |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2547 prec = context.prec+1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2548 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2549 # write argument in the form c*100**e where e = self._exp//2 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2550 # is the 'ideal' exponent, to be used if the square root is |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2551 # exactly representable. l is the number of 'digits' of c in |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2552 # base 100, so that 100**(l-1) <= c < 100**l. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2553 op = _WorkRep(self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2554 e = op.exp >> 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2555 if op.exp & 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2556 c = op.int * 10 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2557 l = (len(self._int) >> 1) + 1 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2558 else: |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2559 c = op.int |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2560 l = len(self._int)+1 >> 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2561 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2562 # rescale so that c has exactly prec base 100 'digits' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2563 shift = prec-l |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2564 if shift >= 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2565 c *= 100**shift |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2566 exact = True |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2567 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2568 c, remainder = divmod(c, 100**-shift) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2569 exact = not remainder |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2570 e -= shift |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2571 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2572 # find n = floor(sqrt(c)) using Newton's method |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2573 n = 10**prec |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2574 while True: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2575 q = c//n |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2576 if n <= q: |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2577 break |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2578 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2579 n = n + q >> 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2580 exact = exact and n*n == c |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2581 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2582 if exact: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2583 # result is exact; rescale to use ideal exponent e |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2584 if shift >= 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2585 # assert n % 10**shift == 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2586 n //= 10**shift |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2587 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2588 n *= 10**-shift |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2589 e += shift |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2590 else: |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2591 # result is not exact; fix last digit as described above |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2592 if n % 5 == 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2593 n += 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2594 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2595 ans = _dec_from_triple(0, str(n), e) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2596 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2597 # round, and fit to current context |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2598 context = context._shallow_copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2599 rounding = context._set_rounding(ROUND_HALF_EVEN) |
| 33695 | 2600 ans = ans._fix(context) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2601 context.rounding = rounding |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2602 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2603 return ans |
|
32451
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Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2604 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2605 def max(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2606 """Returns the larger value. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2607 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2608 Like max(self, other) except if one is not a number, returns |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2609 NaN (and signals if one is sNaN). Also rounds. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2610 """ |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2611 other = _convert_other(other, raiseit=True) |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
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|
2612 |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
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parents:
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diff
changeset
|
2613 if context is None: |
|
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
2614 context = getcontext() |
|
8890be9386b7
The methods always return Decimal classes, even if they're
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parents:
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diff
changeset
|
2615 |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2616 if self._is_special or other._is_special: |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
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parents:
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diff
changeset
|
2617 # If one operand is a quiet NaN and the other is number, then the |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
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parents:
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diff
changeset
|
2618 # number is always returned |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
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parents:
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diff
changeset
|
2619 sn = self._isnan() |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
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parents:
33198
diff
changeset
|
2620 on = other._isnan() |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2621 if sn or on: |
|
50116
01c023d9218e
Merged revisions 67694 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
48847
diff
changeset
|
2622 if on == 1 and sn == 0: |
|
01c023d9218e
Merged revisions 67694 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
48847
diff
changeset
|
2623 return self._fix(context) |
|
01c023d9218e
Merged revisions 67694 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
48847
diff
changeset
|
2624 if sn == 1 and on == 0: |
|
01c023d9218e
Merged revisions 67694 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
48847
diff
changeset
|
2625 return other._fix(context) |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2626 return self._check_nans(other, context) |
|
32451
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Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2627 |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
2628 c = self._cmp(other) |
|
33157
b2f427db228b
Revise max() and min() to comply with the 8/2/2004 update to the specification
Raymond Hettinger <python@rcn.com>
parents:
33044
diff
changeset
|
2629 if c == 0: |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2630 # If both operands are finite and equal in numerical value |
|
33157
b2f427db228b
Revise max() and min() to comply with the 8/2/2004 update to the specification
Raymond Hettinger <python@rcn.com>
parents:
33044
diff
changeset
|
2631 # then an ordering is applied: |
|
b2f427db228b
Revise max() and min() to comply with the 8/2/2004 update to the specification
Raymond Hettinger <python@rcn.com>
parents:
33044
diff
changeset
|
2632 # |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
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parents:
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diff
changeset
|
2633 # If the signs differ then max returns the operand with the |
|
33157
b2f427db228b
Revise max() and min() to comply with the 8/2/2004 update to the specification
Raymond Hettinger <python@rcn.com>
parents:
33044
diff
changeset
|
2634 # positive sign and min returns the operand with the negative sign |
|
b2f427db228b
Revise max() and min() to comply with the 8/2/2004 update to the specification
Raymond Hettinger <python@rcn.com>
parents:
33044
diff
changeset
|
2635 # |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2636 # If the signs are the same then the exponent is used to select |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2637 # the result. This is exactly the ordering used in compare_total. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2638 c = self.compare_total(other) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2639 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2640 if c == -1: |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2641 ans = other |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2642 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2643 ans = self |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2644 |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
2645 return ans._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2646 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2647 def min(self, other, context=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2648 """Returns the smaller value. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2649 |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
2650 Like min(self, other) except if one is not a number, returns |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2651 NaN (and signals if one is sNaN). Also rounds. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2652 """ |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2653 other = _convert_other(other, raiseit=True) |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2654 |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
2655 if context is None: |
|
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
2656 context = getcontext() |
|
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
2657 |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2658 if self._is_special or other._is_special: |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
2659 # If one operand is a quiet NaN and the other is number, then the |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2660 # number is always returned |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2661 sn = self._isnan() |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2662 on = other._isnan() |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2663 if sn or on: |
|
50116
01c023d9218e
Merged revisions 67694 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
48847
diff
changeset
|
2664 if on == 1 and sn == 0: |
|
01c023d9218e
Merged revisions 67694 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
48847
diff
changeset
|
2665 return self._fix(context) |
|
01c023d9218e
Merged revisions 67694 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
48847
diff
changeset
|
2666 if sn == 1 and on == 0: |
|
01c023d9218e
Merged revisions 67694 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
48847
diff
changeset
|
2667 return other._fix(context) |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2668 return self._check_nans(other, context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2669 |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
2670 c = self._cmp(other) |
|
33157
b2f427db228b
Revise max() and min() to comply with the 8/2/2004 update to the specification
Raymond Hettinger <python@rcn.com>
parents:
33044
diff
changeset
|
2671 if c == 0: |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2672 c = self.compare_total(other) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2673 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2674 if c == -1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2675 ans = self |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2676 else: |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2677 ans = other |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
2678 |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
2679 return ans._fix(context) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2680 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2681 def _isinteger(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2682 """Returns whether self is an integer""" |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2683 if self._is_special: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2684 return False |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2685 if self._exp >= 0: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2686 return True |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2687 rest = self._int[self._exp:] |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2688 return rest == '0'*len(rest) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2689 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2690 def _iseven(self): |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2691 """Returns True if self is even. Assumes self is an integer.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2692 if not self or self._exp > 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
2693 return True |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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parents:
43602
diff
changeset
|
2694 return self._int[-1+self._exp] in '02468' |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2695 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2696 def adjusted(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2697 """Return the adjusted exponent of self""" |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2698 try: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2699 return self._exp + len(self._int) - 1 |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2700 # If NaN or Infinity, self._exp is string |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2701 except TypeError: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2702 return 0 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
2703 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2704 def canonical(self, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2705 """Returns the same Decimal object. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2706 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2707 As we do not have different encodings for the same number, the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2708 received object already is in its canonical form. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2709 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2710 return self |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2711 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2712 def compare_signal(self, other, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2713 """Compares self to the other operand numerically. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2714 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2715 It's pretty much like compare(), but all NaNs signal, with signaling |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2716 NaNs taking precedence over quiet NaNs. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2717 """ |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
2718 other = _convert_other(other, raiseit = True) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
2719 ans = self._compare_check_nans(other, context) |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
2720 if ans: |
|
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
2721 return ans |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2722 return self.compare(other, context=context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2723 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2724 def compare_total(self, other): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2725 """Compares self to other using the abstract representations. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2726 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2727 This is not like the standard compare, which use their numerical |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2728 value. Note that a total ordering is defined for all possible abstract |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2729 representations. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2730 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2731 # if one is negative and the other is positive, it's easy |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2732 if self._sign and not other._sign: |
| 50497 | 2733 return _NegativeOne |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2734 if not self._sign and other._sign: |
| 50497 | 2735 return _One |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2736 sign = self._sign |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2737 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2738 # let's handle both NaN types |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2739 self_nan = self._isnan() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2740 other_nan = other._isnan() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2741 if self_nan or other_nan: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2742 if self_nan == other_nan: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2743 if self._int < other._int: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2744 if sign: |
| 50497 | 2745 return _One |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2746 else: |
| 50497 | 2747 return _NegativeOne |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2748 if self._int > other._int: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2749 if sign: |
| 50497 | 2750 return _NegativeOne |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2751 else: |
| 50497 | 2752 return _One |
| 2753 return _Zero | |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2754 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2755 if sign: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2756 if self_nan == 1: |
| 50497 | 2757 return _NegativeOne |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2758 if other_nan == 1: |
| 50497 | 2759 return _One |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2760 if self_nan == 2: |
| 50497 | 2761 return _NegativeOne |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2762 if other_nan == 2: |
| 50497 | 2763 return _One |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2764 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2765 if self_nan == 1: |
| 50497 | 2766 return _One |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2767 if other_nan == 1: |
| 50497 | 2768 return _NegativeOne |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2769 if self_nan == 2: |
| 50497 | 2770 return _One |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2771 if other_nan == 2: |
| 50497 | 2772 return _NegativeOne |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2773 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2774 if self < other: |
| 50497 | 2775 return _NegativeOne |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2776 if self > other: |
| 50497 | 2777 return _One |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2778 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2779 if self._exp < other._exp: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2780 if sign: |
| 50497 | 2781 return _One |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2782 else: |
| 50497 | 2783 return _NegativeOne |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2784 if self._exp > other._exp: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2785 if sign: |
| 50497 | 2786 return _NegativeOne |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2787 else: |
| 50497 | 2788 return _One |
| 2789 return _Zero | |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2790 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2791 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2792 def compare_total_mag(self, other): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2793 """Compares self to other using abstract repr., ignoring sign. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2794 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2795 Like compare_total, but with operand's sign ignored and assumed to be 0. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2796 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2797 s = self.copy_abs() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2798 o = other.copy_abs() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2799 return s.compare_total(o) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2800 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2801 def copy_abs(self): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2802 """Returns a copy with the sign set to 0. """ |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2803 return _dec_from_triple(0, self._int, self._exp, self._is_special) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2804 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2805 def copy_negate(self): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2806 """Returns a copy with the sign inverted.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2807 if self._sign: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2808 return _dec_from_triple(0, self._int, self._exp, self._is_special) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2809 else: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2810 return _dec_from_triple(1, self._int, self._exp, self._is_special) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2811 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2812 def copy_sign(self, other): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2813 """Returns self with the sign of other.""" |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2814 return _dec_from_triple(other._sign, self._int, |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2815 self._exp, self._is_special) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2816 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2817 def exp(self, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2818 """Returns e ** self.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2819 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2820 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2821 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2822 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2823 # exp(NaN) = NaN |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2824 ans = self._check_nans(context=context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2825 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2826 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2827 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2828 # exp(-Infinity) = 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2829 if self._isinfinity() == -1: |
| 50497 | 2830 return _Zero |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2831 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2832 # exp(0) = 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2833 if not self: |
| 50497 | 2834 return _One |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2835 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2836 # exp(Infinity) = Infinity |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2837 if self._isinfinity() == 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2838 return Decimal(self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2839 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2840 # the result is now guaranteed to be inexact (the true |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2841 # mathematical result is transcendental). There's no need to |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2842 # raise Rounded and Inexact here---they'll always be raised as |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2843 # a result of the call to _fix. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2844 p = context.prec |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2845 adj = self.adjusted() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2846 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2847 # we only need to do any computation for quite a small range |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2848 # of adjusted exponents---for example, -29 <= adj <= 10 for |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2849 # the default context. For smaller exponent the result is |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2850 # indistinguishable from 1 at the given precision, while for |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2851 # larger exponent the result either overflows or underflows. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2852 if self._sign == 0 and adj > len(str((context.Emax+1)*3)): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2853 # overflow |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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parents:
43602
diff
changeset
|
2854 ans = _dec_from_triple(0, '1', context.Emax+1) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2855 elif self._sign == 1 and adj > len(str((-context.Etiny()+1)*3)): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2856 # underflow to 0 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2857 ans = _dec_from_triple(0, '1', context.Etiny()-1) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2858 elif self._sign == 0 and adj < -p: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2859 # p+1 digits; final round will raise correct flags |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2860 ans = _dec_from_triple(0, '1' + '0'*(p-1) + '1', -p) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2861 elif self._sign == 1 and adj < -p-1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2862 # p+1 digits; final round will raise correct flags |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2863 ans = _dec_from_triple(0, '9'*(p+1), -p-1) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2864 # general case |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2865 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2866 op = _WorkRep(self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2867 c, e = op.int, op.exp |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2868 if op.sign == 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2869 c = -c |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2870 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2871 # compute correctly rounded result: increase precision by |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2872 # 3 digits at a time until we get an unambiguously |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2873 # roundable result |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2874 extra = 3 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2875 while True: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2876 coeff, exp = _dexp(c, e, p+extra) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2877 if coeff % (5*10**(len(str(coeff))-p-1)): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2878 break |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2879 extra += 3 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2880 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2881 ans = _dec_from_triple(0, str(coeff), exp) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2882 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2883 # at this stage, ans should round correctly with *any* |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2884 # rounding mode, not just with ROUND_HALF_EVEN |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2885 context = context._shallow_copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2886 rounding = context._set_rounding(ROUND_HALF_EVEN) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2887 ans = ans._fix(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2888 context.rounding = rounding |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2889 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2890 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2891 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2892 def is_canonical(self): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2893 """Return True if self is canonical; otherwise return False. |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2894 |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2895 Currently, the encoding of a Decimal instance is always |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2896 canonical, so this method returns True for any Decimal. |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2897 """ |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2898 return True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2899 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2900 def is_finite(self): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2901 """Return True if self is finite; otherwise return False. |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2902 |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2903 A Decimal instance is considered finite if it is neither |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2904 infinite nor a NaN. |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2905 """ |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2906 return not self._is_special |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2907 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2908 def is_infinite(self): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2909 """Return True if self is infinite; otherwise return False.""" |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2910 return self._exp == 'F' |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2911 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2912 def is_nan(self): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2913 """Return True if self is a qNaN or sNaN; otherwise return False.""" |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2914 return self._exp in ('n', 'N') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2915 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2916 def is_normal(self, context=None): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2917 """Return True if self is a normal number; otherwise return False.""" |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2918 if self._is_special or not self: |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2919 return False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2920 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2921 context = getcontext() |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2922 return context.Emin <= self.adjusted() <= context.Emax |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2923 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
42605
diff
changeset
|
2924 def is_qnan(self): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2925 """Return True if self is a quiet NaN; otherwise return False.""" |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2926 return self._exp == 'n' |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2927 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2928 def is_signed(self): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2929 """Return True if self is negative; otherwise return False.""" |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2930 return self._sign == 1 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2931 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2932 def is_snan(self): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2933 """Return True if self is a signaling NaN; otherwise return False.""" |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2934 return self._exp == 'N' |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2935 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2936 def is_subnormal(self, context=None): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2937 """Return True if self is subnormal; otherwise return False.""" |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2938 if self._is_special or not self: |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2939 return False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2940 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2941 context = getcontext() |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2942 return self.adjusted() < context.Emin |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2943 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2944 def is_zero(self): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
2945 """Return True if self is a zero; otherwise return False.""" |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
2946 return not self._is_special and self._int == '0' |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2947 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2948 def _ln_exp_bound(self): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2949 """Compute a lower bound for the adjusted exponent of self.ln(). |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2950 In other words, compute r such that self.ln() >= 10**r. Assumes |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2951 that self is finite and positive and that self != 1. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2952 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2953 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2954 # for 0.1 <= x <= 10 we use the inequalities 1-1/x <= ln(x) <= x-1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2955 adj = self._exp + len(self._int) - 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2956 if adj >= 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2957 # argument >= 10; we use 23/10 = 2.3 as a lower bound for ln(10) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
2958 return len(str(adj*23//10)) - 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2959 if adj <= -2: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2960 # argument <= 0.1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2961 return len(str((-1-adj)*23//10)) - 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2962 op = _WorkRep(self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2963 c, e = op.int, op.exp |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2964 if adj == 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2965 # 1 < self < 10 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2966 num = str(c-10**-e) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2967 den = str(c) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2968 return len(num) - len(den) - (num < den) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2969 # adj == -1, 0.1 <= self < 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2970 return e + len(str(10**-e - c)) - 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2971 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2972 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2973 def ln(self, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2974 """Returns the natural (base e) logarithm of self.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2975 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2976 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2977 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2978 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2979 # ln(NaN) = NaN |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2980 ans = self._check_nans(context=context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2981 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2982 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2983 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2984 # ln(0.0) == -Infinity |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2985 if not self: |
| 50497 | 2986 return _NegativeInfinity |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2987 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2988 # ln(Infinity) = Infinity |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2989 if self._isinfinity() == 1: |
| 50497 | 2990 return _Infinity |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2991 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2992 # ln(1.0) == 0.0 |
| 50497 | 2993 if self == _One: |
| 2994 return _Zero | |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2995 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2996 # ln(negative) raises InvalidOperation |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2997 if self._sign == 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2998 return context._raise_error(InvalidOperation, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
2999 'ln of a negative value') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3000 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3001 # result is irrational, so necessarily inexact |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3002 op = _WorkRep(self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3003 c, e = op.int, op.exp |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3004 p = context.prec |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3005 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3006 # correctly rounded result: repeatedly increase precision by 3 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3007 # until we get an unambiguously roundable result |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3008 places = p - self._ln_exp_bound() + 2 # at least p+3 places |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3009 while True: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3010 coeff = _dlog(c, e, places) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3011 # assert len(str(abs(coeff)))-p >= 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3012 if coeff % (5*10**(len(str(abs(coeff)))-p-1)): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3013 break |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3014 places += 3 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3015 ans = _dec_from_triple(int(coeff<0), str(abs(coeff)), -places) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3016 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3017 context = context._shallow_copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3018 rounding = context._set_rounding(ROUND_HALF_EVEN) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3019 ans = ans._fix(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3020 context.rounding = rounding |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3021 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3022 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3023 def _log10_exp_bound(self): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3024 """Compute a lower bound for the adjusted exponent of self.log10(). |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3025 In other words, find r such that self.log10() >= 10**r. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3026 Assumes that self is finite and positive and that self != 1. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3027 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3028 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3029 # For x >= 10 or x < 0.1 we only need a bound on the integer |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3030 # part of log10(self), and this comes directly from the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3031 # exponent of x. For 0.1 <= x <= 10 we use the inequalities |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3032 # 1-1/x <= log(x) <= x-1. If x > 1 we have |log10(x)| > |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3033 # (1-1/x)/2.31 > 0. If x < 1 then |log10(x)| > (1-x)/2.31 > 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3034 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3035 adj = self._exp + len(self._int) - 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3036 if adj >= 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3037 # self >= 10 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3038 return len(str(adj))-1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3039 if adj <= -2: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3040 # self < 0.1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3041 return len(str(-1-adj))-1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3042 op = _WorkRep(self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3043 c, e = op.int, op.exp |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3044 if adj == 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3045 # 1 < self < 10 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3046 num = str(c-10**-e) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3047 den = str(231*c) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3048 return len(num) - len(den) - (num < den) + 2 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3049 # adj == -1, 0.1 <= self < 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3050 num = str(10**-e-c) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3051 return len(num) + e - (num < "231") - 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3052 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3053 def log10(self, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3054 """Returns the base 10 logarithm of self.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3055 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3056 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3057 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3058 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3059 # log10(NaN) = NaN |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3060 ans = self._check_nans(context=context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3061 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3062 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3063 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3064 # log10(0.0) == -Infinity |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3065 if not self: |
| 50497 | 3066 return _NegativeInfinity |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3067 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3068 # log10(Infinity) = Infinity |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3069 if self._isinfinity() == 1: |
| 50497 | 3070 return _Infinity |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3071 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3072 # log10(negative or -Infinity) raises InvalidOperation |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3073 if self._sign == 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3074 return context._raise_error(InvalidOperation, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3075 'log10 of a negative value') |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3076 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3077 # log10(10**n) = n |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3078 if self._int[0] == '1' and self._int[1:] == '0'*(len(self._int) - 1): |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3079 # answer may need rounding |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3080 ans = Decimal(self._exp + len(self._int) - 1) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3081 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3082 # result is irrational, so necessarily inexact |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3083 op = _WorkRep(self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3084 c, e = op.int, op.exp |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3085 p = context.prec |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3086 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3087 # correctly rounded result: repeatedly increase precision |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3088 # until result is unambiguously roundable |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3089 places = p-self._log10_exp_bound()+2 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3090 while True: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3091 coeff = _dlog10(c, e, places) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3092 # assert len(str(abs(coeff)))-p >= 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3093 if coeff % (5*10**(len(str(abs(coeff)))-p-1)): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3094 break |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3095 places += 3 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3096 ans = _dec_from_triple(int(coeff<0), str(abs(coeff)), -places) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3097 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3098 context = context._shallow_copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3099 rounding = context._set_rounding(ROUND_HALF_EVEN) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3100 ans = ans._fix(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3101 context.rounding = rounding |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3102 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3103 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3104 def logb(self, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3105 """ Returns the exponent of the magnitude of self's MSD. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3106 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3107 The result is the integer which is the exponent of the magnitude |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3108 of the most significant digit of self (as though it were truncated |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3109 to a single digit while maintaining the value of that digit and |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3110 without limiting the resulting exponent). |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3111 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3112 # logb(NaN) = NaN |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3113 ans = self._check_nans(context=context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3114 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3115 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3116 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3117 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3118 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3119 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3120 # logb(+/-Inf) = +Inf |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3121 if self._isinfinity(): |
| 50497 | 3122 return _Infinity |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3123 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3124 # logb(0) = -Inf, DivisionByZero |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3125 if not self: |
|
43391
b9236a75a6e5
Speed up of the various division operations (remainder, divide,
Facundo Batista <facundobatista@gmail.com>
parents:
43383
diff
changeset
|
3126 return context._raise_error(DivisionByZero, 'logb(0)', 1) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3127 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3128 # otherwise, simply return the adjusted exponent of self, as a |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3129 # Decimal. Note that no attempt is made to fit the result |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
3130 # into the current context. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3131 return Decimal(self.adjusted()) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3132 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3133 def _islogical(self): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3134 """Return True if self is a logical operand. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3135 |
| 44701 | 3136 For being logical, it must be a finite number with a sign of 0, |
|
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3137 an exponent of 0, and a coefficient whose digits must all be |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3138 either 0 or 1. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3139 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3140 if self._sign != 0 or self._exp != 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3141 return False |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3142 for dig in self._int: |
|
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a4a140486691
Major change in the internal structure of the Decimal
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diff
changeset
|
3143 if dig not in '01': |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3144 return False |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3145 return True |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3146 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3147 def _fill_logical(self, context, opa, opb): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
3148 dif = context.prec - len(opa) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
3149 if dif > 0: |
|
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a4a140486691
Major change in the internal structure of the Decimal
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diff
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|
3150 opa = '0'*dif + opa |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3151 elif dif < 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3152 opa = opa[-context.prec:] |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3153 dif = context.prec - len(opb) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
3154 if dif > 0: |
|
43993
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Major change in the internal structure of the Decimal
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diff
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|
3155 opb = '0'*dif + opb |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3156 elif dif < 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3157 opb = opb[-context.prec:] |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3158 return opa, opb |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3159 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3160 def logical_and(self, other, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3161 """Applies an 'and' operation between self and other's digits.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3162 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3163 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3164 if not self._islogical() or not other._islogical(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
3165 return context._raise_error(InvalidOperation) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3166 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3167 # fill to context.prec |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
3168 (opa, opb) = self._fill_logical(context, self._int, other._int) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3169 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3170 # make the operation, and clean starting zeroes |
|
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Major change in the internal structure of the Decimal
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|
3171 result = "".join([str(int(a)&int(b)) for a,b in zip(opa,opb)]) |
|
a4a140486691
Major change in the internal structure of the Decimal
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diff
changeset
|
3172 return _dec_from_triple(0, result.lstrip('0') or '0', 0) |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3173 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3174 def logical_invert(self, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3175 """Invert all its digits.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3176 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3177 context = getcontext() |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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diff
changeset
|
3178 return self.logical_xor(_dec_from_triple(0,'1'*context.prec,0), |
|
a4a140486691
Major change in the internal structure of the Decimal
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diff
changeset
|
3179 context) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3180 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3181 def logical_or(self, other, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3182 """Applies an 'or' operation between self and other's digits.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3183 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3184 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3185 if not self._islogical() or not other._islogical(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3186 return context._raise_error(InvalidOperation) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3187 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3188 # fill to context.prec |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3189 (opa, opb) = self._fill_logical(context, self._int, other._int) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3190 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3191 # make the operation, and clean starting zeroes |
|
50598
09a498eb1820
More Python 2.3 compatibility fixes for decimal.py.
Mark Dickinson <dickinsm@gmail.com>
parents:
50595
diff
changeset
|
3192 result = "".join([str(int(a)|int(b)) for a,b in zip(opa,opb)]) |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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parents:
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diff
changeset
|
3193 return _dec_from_triple(0, result.lstrip('0') or '0', 0) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3194 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3195 def logical_xor(self, other, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3196 """Applies an 'xor' operation between self and other's digits.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3197 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3198 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3199 if not self._islogical() or not other._islogical(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3200 return context._raise_error(InvalidOperation) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3201 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3202 # fill to context.prec |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3203 (opa, opb) = self._fill_logical(context, self._int, other._int) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3204 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3205 # make the operation, and clean starting zeroes |
|
50598
09a498eb1820
More Python 2.3 compatibility fixes for decimal.py.
Mark Dickinson <dickinsm@gmail.com>
parents:
50595
diff
changeset
|
3206 result = "".join([str(int(a)^int(b)) for a,b in zip(opa,opb)]) |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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diff
changeset
|
3207 return _dec_from_triple(0, result.lstrip('0') or '0', 0) |
|
43360
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diff
changeset
|
3208 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3209 def max_mag(self, other, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3210 """Compares the values numerically with their sign ignored.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3211 other = _convert_other(other, raiseit=True) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3212 |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
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parents:
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diff
changeset
|
3213 if context is None: |
|
8890be9386b7
The methods always return Decimal classes, even if they're
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parents:
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diff
changeset
|
3214 context = getcontext() |
|
8890be9386b7
The methods always return Decimal classes, even if they're
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diff
changeset
|
3215 |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3216 if self._is_special or other._is_special: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3217 # If one operand is a quiet NaN and the other is number, then the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3218 # number is always returned |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3219 sn = self._isnan() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3220 on = other._isnan() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3221 if sn or on: |
|
50116
01c023d9218e
Merged revisions 67694 via svnmerge from
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diff
changeset
|
3222 if on == 1 and sn == 0: |
|
01c023d9218e
Merged revisions 67694 via svnmerge from
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diff
changeset
|
3223 return self._fix(context) |
|
01c023d9218e
Merged revisions 67694 via svnmerge from
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diff
changeset
|
3224 if sn == 1 and on == 0: |
|
01c023d9218e
Merged revisions 67694 via svnmerge from
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48847
diff
changeset
|
3225 return other._fix(context) |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3226 return self._check_nans(other, context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3227 |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
3228 c = self.copy_abs()._cmp(other.copy_abs()) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3229 if c == 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3230 c = self.compare_total(other) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3231 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3232 if c == -1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3233 ans = other |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3234 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3235 ans = self |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3236 |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
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parents:
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diff
changeset
|
3237 return ans._fix(context) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3238 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3239 def min_mag(self, other, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3240 """Compares the values numerically with their sign ignored.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3241 other = _convert_other(other, raiseit=True) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3242 |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
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parents:
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diff
changeset
|
3243 if context is None: |
|
8890be9386b7
The methods always return Decimal classes, even if they're
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parents:
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diff
changeset
|
3244 context = getcontext() |
|
8890be9386b7
The methods always return Decimal classes, even if they're
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parents:
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diff
changeset
|
3245 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3246 if self._is_special or other._is_special: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3247 # If one operand is a quiet NaN and the other is number, then the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3248 # number is always returned |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3249 sn = self._isnan() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3250 on = other._isnan() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3251 if sn or on: |
|
50116
01c023d9218e
Merged revisions 67694 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
48847
diff
changeset
|
3252 if on == 1 and sn == 0: |
|
01c023d9218e
Merged revisions 67694 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
48847
diff
changeset
|
3253 return self._fix(context) |
|
01c023d9218e
Merged revisions 67694 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
48847
diff
changeset
|
3254 if sn == 1 and on == 0: |
|
01c023d9218e
Merged revisions 67694 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
48847
diff
changeset
|
3255 return other._fix(context) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3256 return self._check_nans(other, context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3257 |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
3258 c = self.copy_abs()._cmp(other.copy_abs()) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3259 if c == 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3260 c = self.compare_total(other) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3261 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3262 if c == -1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3263 ans = self |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3264 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3265 ans = other |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3266 |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3267 return ans._fix(context) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3268 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3269 def next_minus(self, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3270 """Returns the largest representable number smaller than itself.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3271 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3272 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3273 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3274 ans = self._check_nans(context=context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3275 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3276 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3277 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3278 if self._isinfinity() == -1: |
| 50497 | 3279 return _NegativeInfinity |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3280 if self._isinfinity() == 1: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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parents:
43602
diff
changeset
|
3281 return _dec_from_triple(0, '9'*context.prec, context.Etop()) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3282 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3283 context = context.copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3284 context._set_rounding(ROUND_FLOOR) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3285 context._ignore_all_flags() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3286 new_self = self._fix(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3287 if new_self != self: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3288 return new_self |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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parents:
43602
diff
changeset
|
3289 return self.__sub__(_dec_from_triple(0, '1', context.Etiny()-1), |
|
a4a140486691
Major change in the internal structure of the Decimal
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parents:
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diff
changeset
|
3290 context) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3291 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3292 def next_plus(self, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3293 """Returns the smallest representable number larger than itself.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3294 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3295 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3296 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3297 ans = self._check_nans(context=context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3298 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3299 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3300 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3301 if self._isinfinity() == 1: |
| 50497 | 3302 return _Infinity |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3303 if self._isinfinity() == -1: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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parents:
43602
diff
changeset
|
3304 return _dec_from_triple(1, '9'*context.prec, context.Etop()) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3305 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3306 context = context.copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3307 context._set_rounding(ROUND_CEILING) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3308 context._ignore_all_flags() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3309 new_self = self._fix(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3310 if new_self != self: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3311 return new_self |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
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parents:
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diff
changeset
|
3312 return self.__add__(_dec_from_triple(0, '1', context.Etiny()-1), |
|
a4a140486691
Major change in the internal structure of the Decimal
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parents:
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diff
changeset
|
3313 context) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3314 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3315 def next_toward(self, other, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3316 """Returns the number closest to self, in the direction towards other. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3317 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3318 The result is the closest representable number to self |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
3319 (excluding self) that is in the direction towards other, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3320 unless both have the same value. If the two operands are |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3321 numerically equal, then the result is a copy of self with the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3322 sign set to be the same as the sign of other. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3323 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3324 other = _convert_other(other, raiseit=True) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3325 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3326 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3327 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3328 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3329 ans = self._check_nans(other, context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3330 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3331 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3332 |
|
45201
f55a4f119141
Issue 1979: Make Decimal comparisons (other than !=, ==) involving NaN
Mark Dickinson <dickinsm@gmail.com>
parents:
44923
diff
changeset
|
3333 comparison = self._cmp(other) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3334 if comparison == 0: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3335 return self.copy_sign(other) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3336 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3337 if comparison == -1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3338 ans = self.next_plus(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3339 else: # comparison == 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3340 ans = self.next_minus(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3341 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3342 # decide which flags to raise using value of ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3343 if ans._isinfinity(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3344 context._raise_error(Overflow, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3345 'Infinite result from next_toward', |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3346 ans._sign) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3347 context._raise_error(Rounded) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3348 context._raise_error(Inexact) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3349 elif ans.adjusted() < context.Emin: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3350 context._raise_error(Underflow) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3351 context._raise_error(Subnormal) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3352 context._raise_error(Rounded) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3353 context._raise_error(Inexact) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3354 # if precision == 1 then we don't raise Clamped for a |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3355 # result 0E-Etiny. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3356 if not ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3357 context._raise_error(Clamped) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3358 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3359 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3360 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3361 def number_class(self, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3362 """Returns an indication of the class of self. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3363 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3364 The class is one of the following strings: |
|
44352
f7bc79112bcf
Some minor cleanups. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44328
diff
changeset
|
3365 sNaN |
|
f7bc79112bcf
Some minor cleanups. Thanks Mark Dickinson.
Facundo Batista <facundobatista@gmail.com>
parents:
44328
diff
changeset
|
3366 NaN |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3367 -Infinity |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3368 -Normal |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3369 -Subnormal |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3370 -Zero |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3371 +Zero |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3372 +Subnormal |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3373 +Normal |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3374 +Infinity |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3375 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3376 if self.is_snan(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3377 return "sNaN" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3378 if self.is_qnan(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3379 return "NaN" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3380 inf = self._isinfinity() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3381 if inf == 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3382 return "+Infinity" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3383 if inf == -1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3384 return "-Infinity" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3385 if self.is_zero(): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3386 if self._sign: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3387 return "-Zero" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3388 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3389 return "+Zero" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3390 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3391 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3392 if self.is_subnormal(context=context): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3393 if self._sign: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3394 return "-Subnormal" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3395 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3396 return "+Subnormal" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3397 # just a normal, regular, boring number, :) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3398 if self._sign: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3399 return "-Normal" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3400 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3401 return "+Normal" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3402 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3403 def radix(self): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3404 """Just returns 10, as this is Decimal, :)""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3405 return Decimal(10) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3406 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3407 def rotate(self, other, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3408 """Returns a rotated copy of self, value-of-other times.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3409 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3410 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3411 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3412 ans = self._check_nans(other, context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3413 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3414 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3415 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3416 if other._exp != 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3417 return context._raise_error(InvalidOperation) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3418 if not (-context.prec <= int(other) <= context.prec): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3419 return context._raise_error(InvalidOperation) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3420 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3421 if self._isinfinity(): |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
3422 return Decimal(self) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3423 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3424 # get values, pad if necessary |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3425 torot = int(other) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3426 rotdig = self._int |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3427 topad = context.prec - len(rotdig) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3428 if topad: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3429 rotdig = '0'*topad + rotdig |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3430 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3431 # let's rotate! |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3432 rotated = rotdig[torot:] + rotdig[:torot] |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3433 return _dec_from_triple(self._sign, |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3434 rotated.lstrip('0') or '0', self._exp) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3435 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3436 def scaleb (self, other, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3437 """Returns self operand after adding the second value to its exp.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3438 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3439 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3440 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3441 ans = self._check_nans(other, context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3442 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3443 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3444 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3445 if other._exp != 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3446 return context._raise_error(InvalidOperation) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3447 liminf = -2 * (context.Emax + context.prec) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3448 limsup = 2 * (context.Emax + context.prec) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3449 if not (liminf <= int(other) <= limsup): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3450 return context._raise_error(InvalidOperation) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3451 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3452 if self._isinfinity(): |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
3453 return Decimal(self) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3454 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3455 d = _dec_from_triple(self._sign, self._int, self._exp + int(other)) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3456 d = d._fix(context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3457 return d |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3458 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3459 def shift(self, other, context=None): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3460 """Returns a shifted copy of self, value-of-other times.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3461 if context is None: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3462 context = getcontext() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3463 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3464 ans = self._check_nans(other, context) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3465 if ans: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3466 return ans |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3467 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3468 if other._exp != 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3469 return context._raise_error(InvalidOperation) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3470 if not (-context.prec <= int(other) <= context.prec): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3471 return context._raise_error(InvalidOperation) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3472 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3473 if self._isinfinity(): |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
3474 return Decimal(self) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3475 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3476 # get values, pad if necessary |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3477 torot = int(other) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3478 if not torot: |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
3479 return Decimal(self) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3480 rotdig = self._int |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3481 topad = context.prec - len(rotdig) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3482 if topad: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3483 rotdig = '0'*topad + rotdig |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3484 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3485 # let's shift! |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3486 if torot < 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3487 rotated = rotdig[:torot] |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3488 else: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3489 rotated = rotdig + '0'*torot |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3490 rotated = rotated[-context.prec:] |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3491 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3492 return _dec_from_triple(self._sign, |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3493 rotated.lstrip('0') or '0', self._exp) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3494 |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3495 # Support for pickling, copy, and deepcopy |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3496 def __reduce__(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3497 return (self.__class__, (str(self),)) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3498 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3499 def __copy__(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3500 if type(self) == Decimal: |
|
39120
1d7da8608031
Revert r50706 (Whitespace normalization) and
Martin v. Löwis <martin@v.loewis.de>
parents:
39117
diff
changeset
|
3501 return self # I'm immutable; therefore I am my own clone |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3502 return self.__class__(str(self)) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3503 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3504 def __deepcopy__(self, memo): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3505 if type(self) == Decimal: |
|
39120
1d7da8608031
Revert r50706 (Whitespace normalization) and
Martin v. Löwis <martin@v.loewis.de>
parents:
39117
diff
changeset
|
3506 return self # My components are also immutable |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3507 return self.__class__(str(self)) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3508 |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3509 # PEP 3101 support. the _localeconv keyword argument should be |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3510 # considered private: it's provided for ease of testing only. |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3511 def __format__(self, specifier, context=None, _localeconv=None): |
| 45568 | 3512 """Format a Decimal instance according to the given specifier. |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3513 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3514 The specifier should be a standard format specifier, with the |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3515 form described in PEP 3101. Formatting types 'e', 'E', 'f', |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3516 'F', 'g', 'G', 'n' and '%' are supported. If the formatting |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3517 type is omitted it defaults to 'g' or 'G', depending on the |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3518 value of context.capitals. |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3519 """ |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3520 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3521 # Note: PEP 3101 says that if the type is not present then |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3522 # there should be at least one digit after the decimal point. |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3523 # We take the liberty of ignoring this requirement for |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3524 # Decimal---it's presumably there to make sure that |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3525 # format(float, '') behaves similarly to str(float). |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3526 if context is None: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3527 context = getcontext() |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3528 |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3529 spec = _parse_format_specifier(specifier, _localeconv=_localeconv) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3530 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3531 # special values don't care about the type or precision |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3532 if self._is_special: |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3533 sign = _format_sign(self._sign, spec) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3534 body = str(self.copy_abs()) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3535 return _format_align(sign, body, spec) |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3536 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3537 # a type of None defaults to 'g' or 'G', depending on context |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3538 if spec['type'] is None: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3539 spec['type'] = ['g', 'G'][context.capitals] |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3540 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3541 # if type is '%', adjust exponent of self accordingly |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3542 if spec['type'] == '%': |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3543 self = _dec_from_triple(self._sign, self._int, self._exp+2) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3544 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3545 # round if necessary, taking rounding mode from the context |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3546 rounding = context.rounding |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3547 precision = spec['precision'] |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3548 if precision is not None: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3549 if spec['type'] in 'eE': |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3550 self = self._round(precision+1, rounding) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3551 elif spec['type'] in 'fF%': |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3552 self = self._rescale(-precision, rounding) |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3553 elif spec['type'] in 'gG' and len(self._int) > precision: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3554 self = self._round(precision, rounding) |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3555 # special case: zeros with a positive exponent can't be |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3556 # represented in fixed point; rescale them to 0e0. |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3557 if not self and self._exp > 0 and spec['type'] in 'fF%': |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3558 self = self._rescale(0, rounding) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3559 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3560 # figure out placement of the decimal point |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3561 leftdigits = self._exp + len(self._int) |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3562 if spec['type'] in 'eE': |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3563 if not self and precision is not None: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3564 dotplace = 1 - precision |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3565 else: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3566 dotplace = 1 |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3567 elif spec['type'] in 'fF%': |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3568 dotplace = leftdigits |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3569 elif spec['type'] in 'gG': |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3570 if self._exp <= 0 and leftdigits > -6: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3571 dotplace = leftdigits |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3572 else: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3573 dotplace = 1 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3574 |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3575 # find digits before and after decimal point, and get exponent |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3576 if dotplace < 0: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3577 intpart = '0' |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3578 fracpart = '0'*(-dotplace) + self._int |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3579 elif dotplace > len(self._int): |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3580 intpart = self._int + '0'*(dotplace-len(self._int)) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3581 fracpart = '' |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3582 else: |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3583 intpart = self._int[:dotplace] or '0' |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3584 fracpart = self._int[dotplace:] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3585 exp = leftdigits-dotplace |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3586 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3587 # done with the decimal-specific stuff; hand over the rest |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3588 # of the formatting to the _format_number function |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
3589 return _format_number(self._sign, intpart, fracpart, exp, spec) |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
3590 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3591 def _dec_from_triple(sign, coefficient, exponent, special=False): |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3592 """Create a decimal instance directly, without any validation, |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3593 normalization (e.g. removal of leading zeros) or argument |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3594 conversion. |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3595 |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3596 This function is for *internal use only*. |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3597 """ |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3598 |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3599 self = object.__new__(Decimal) |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3600 self._sign = sign |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3601 self._int = coefficient |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3602 self._exp = exponent |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3603 self._is_special = special |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3604 |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3605 return self |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
3606 |
|
51293
5c254795aa07
Register decimals as numbers.Number
Raymond Hettinger <python@rcn.com>
parents:
51027
diff
changeset
|
3607 # Register Decimal as a kind of Number (an abstract base class). |
|
5c254795aa07
Register decimals as numbers.Number
Raymond Hettinger <python@rcn.com>
parents:
51027
diff
changeset
|
3608 # However, do not register it as Real (because Decimals are not |
|
5c254795aa07
Register decimals as numbers.Number
Raymond Hettinger <python@rcn.com>
parents:
51027
diff
changeset
|
3609 # interoperable with floats). |
|
5c254795aa07
Register decimals as numbers.Number
Raymond Hettinger <python@rcn.com>
parents:
51027
diff
changeset
|
3610 _numbers.Number.register(Decimal) |
|
5c254795aa07
Register decimals as numbers.Number
Raymond Hettinger <python@rcn.com>
parents:
51027
diff
changeset
|
3611 |
|
5c254795aa07
Register decimals as numbers.Number
Raymond Hettinger <python@rcn.com>
parents:
51027
diff
changeset
|
3612 |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3613 ##### Context class ####################################################### |
|
39120
1d7da8608031
Revert r50706 (Whitespace normalization) and
Martin v. Löwis <martin@v.loewis.de>
parents:
39117
diff
changeset
|
3614 |
|
1d7da8608031
Revert r50706 (Whitespace normalization) and
Martin v. Löwis <martin@v.loewis.de>
parents:
39117
diff
changeset
|
3615 |
|
1d7da8608031
Revert r50706 (Whitespace normalization) and
Martin v. Löwis <martin@v.loewis.de>
parents:
39117
diff
changeset
|
3616 # get rounding method function: |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3617 rounding_functions = [name for name in Decimal.__dict__.keys() |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3618 if name.startswith('_round_')] |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3619 for name in rounding_functions: |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3620 # name is like _round_half_even, goes to the global ROUND_HALF_EVEN value. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3621 globalname = name[1:].upper() |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3622 val = globals()[globalname] |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3623 Decimal._pick_rounding_function[val] = name |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3624 |
| 32482 | 3625 del name, val, globalname, rounding_functions |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3626 |
|
39721
2f086d58ca10
Make decimal.ContextManager a private implementation detail of decimal.localcontext()
Nick Coghlan <ncoghlan@gmail.com>
parents:
39707
diff
changeset
|
3627 class _ContextManager(object): |
|
39707
a83957c91fdb
Fix the wrongheaded implementation of context management in the decimal module and add unit tests. (python-dev discussion is ongoing regarding what we do about Python 2.5)
Nick Coghlan <ncoghlan@gmail.com>
parents:
39120
diff
changeset
|
3628 """Context manager class to support localcontext(). |
|
a83957c91fdb
Fix the wrongheaded implementation of context management in the decimal module and add unit tests. (python-dev discussion is ongoing regarding what we do about Python 2.5)
Nick Coghlan <ncoghlan@gmail.com>
parents:
39120
diff
changeset
|
3629 |
|
39721
2f086d58ca10
Make decimal.ContextManager a private implementation detail of decimal.localcontext()
Nick Coghlan <ncoghlan@gmail.com>
parents:
39707
diff
changeset
|
3630 Sets a copy of the supplied context in __enter__() and restores |
|
39707
a83957c91fdb
Fix the wrongheaded implementation of context management in the decimal module and add unit tests. (python-dev discussion is ongoing regarding what we do about Python 2.5)
Nick Coghlan <ncoghlan@gmail.com>
parents:
39120
diff
changeset
|
3631 the previous decimal context in __exit__() |
|
36737
fa92fe15251a
Updates to the with-statement:
Guido van Rossum <guido@python.org>
parents:
35379
diff
changeset
|
3632 """ |
|
fa92fe15251a
Updates to the with-statement:
Guido van Rossum <guido@python.org>
parents:
35379
diff
changeset
|
3633 def __init__(self, new_context): |
|
39721
2f086d58ca10
Make decimal.ContextManager a private implementation detail of decimal.localcontext()
Nick Coghlan <ncoghlan@gmail.com>
parents:
39707
diff
changeset
|
3634 self.new_context = new_context.copy() |
|
36737
fa92fe15251a
Updates to the with-statement:
Guido van Rossum <guido@python.org>
parents:
35379
diff
changeset
|
3635 def __enter__(self): |
|
fa92fe15251a
Updates to the with-statement:
Guido van Rossum <guido@python.org>
parents:
35379
diff
changeset
|
3636 self.saved_context = getcontext() |
|
fa92fe15251a
Updates to the with-statement:
Guido van Rossum <guido@python.org>
parents:
35379
diff
changeset
|
3637 setcontext(self.new_context) |
|
fa92fe15251a
Updates to the with-statement:
Guido van Rossum <guido@python.org>
parents:
35379
diff
changeset
|
3638 return self.new_context |
|
fa92fe15251a
Updates to the with-statement:
Guido van Rossum <guido@python.org>
parents:
35379
diff
changeset
|
3639 def __exit__(self, t, v, tb): |
|
fa92fe15251a
Updates to the with-statement:
Guido van Rossum <guido@python.org>
parents:
35379
diff
changeset
|
3640 setcontext(self.saved_context) |
|
fa92fe15251a
Updates to the with-statement:
Guido van Rossum <guido@python.org>
parents:
35379
diff
changeset
|
3641 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3642 class Context(object): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3643 """Contains the context for a Decimal instance. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3644 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3645 Contains: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3646 prec - precision (for use in rounding, division, square roots..) |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3647 rounding - rounding type (how you round) |
|
32576
83cbc025bfc7
Improve Context construction and representation:
Raymond Hettinger <python@rcn.com>
parents:
32561
diff
changeset
|
3648 traps - If traps[exception] = 1, then the exception is |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3649 raised when it is caused. Otherwise, a value is |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3650 substituted in. |
|
46643
ec09ad5bed1a
Backport Raymond's changes in r60508 to Python 2.6.
Mark Dickinson <dickinsm@gmail.com>
parents:
46625
diff
changeset
|
3651 flags - When an exception is caused, flags[exception] is set. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3652 (Whether or not the trap_enabler is set) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3653 Should be reset by user of Decimal instance. |
|
32489
ab0a2b74ddfd
Changed the rounding constant values to match their variable names.
Raymond Hettinger <python@rcn.com>
parents:
32487
diff
changeset
|
3654 Emin - Minimum exponent |
|
ab0a2b74ddfd
Changed the rounding constant values to match their variable names.
Raymond Hettinger <python@rcn.com>
parents:
32487
diff
changeset
|
3655 Emax - Maximum exponent |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3656 capitals - If 1, 1*10^1 is printed as 1E+1. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3657 If 0, printed as 1e1 |
| 32496 | 3658 _clamp - If 1, change exponents if too high (Default 0) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3659 """ |
| 32482 | 3660 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3661 def __init__(self, prec=None, rounding=None, |
|
33722
74a57e6684f3
Don't use mutable values for method defaults.
Raymond Hettinger <python@rcn.com>
parents:
33695
diff
changeset
|
3662 traps=None, flags=None, |
|
32489
ab0a2b74ddfd
Changed the rounding constant values to match their variable names.
Raymond Hettinger <python@rcn.com>
parents:
32487
diff
changeset
|
3663 Emin=None, Emax=None, |
| 32496 | 3664 capitals=None, _clamp=0, |
|
33722
74a57e6684f3
Don't use mutable values for method defaults.
Raymond Hettinger <python@rcn.com>
parents:
33695
diff
changeset
|
3665 _ignored_flags=None): |
|
74a57e6684f3
Don't use mutable values for method defaults.
Raymond Hettinger <python@rcn.com>
parents:
33695
diff
changeset
|
3666 if flags is None: |
|
74a57e6684f3
Don't use mutable values for method defaults.
Raymond Hettinger <python@rcn.com>
parents:
33695
diff
changeset
|
3667 flags = [] |
|
74a57e6684f3
Don't use mutable values for method defaults.
Raymond Hettinger <python@rcn.com>
parents:
33695
diff
changeset
|
3668 if _ignored_flags is None: |
|
74a57e6684f3
Don't use mutable values for method defaults.
Raymond Hettinger <python@rcn.com>
parents:
33695
diff
changeset
|
3669 _ignored_flags = [] |
|
32576
83cbc025bfc7
Improve Context construction and representation:
Raymond Hettinger <python@rcn.com>
parents:
32561
diff
changeset
|
3670 if not isinstance(flags, dict): |
|
46653
1872e1dc035f
Make sure that Context traps and flags dictionaries have values 0 and 1
Mark Dickinson <dickinsm@gmail.com>
parents:
46651
diff
changeset
|
3671 flags = dict([(s, int(s in flags)) for s in _signals]) |
|
32667
941c239cb6d2
* Hide a loop induction variable that was inadvertantly being picked up
Raymond Hettinger <python@rcn.com>
parents:
32666
diff
changeset
|
3672 del s |
|
32576
83cbc025bfc7
Improve Context construction and representation:
Raymond Hettinger <python@rcn.com>
parents:
32561
diff
changeset
|
3673 if traps is not None and not isinstance(traps, dict): |
|
46653
1872e1dc035f
Make sure that Context traps and flags dictionaries have values 0 and 1
Mark Dickinson <dickinsm@gmail.com>
parents:
46651
diff
changeset
|
3674 traps = dict([(s, int(s in traps)) for s in _signals]) |
|
32667
941c239cb6d2
* Hide a loop induction variable that was inadvertantly being picked up
Raymond Hettinger <python@rcn.com>
parents:
32666
diff
changeset
|
3675 del s |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3676 for name, val in locals().items(): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3677 if val is None: |
|
35035
c55899863b9c
Minor namespace clean-up.
Raymond Hettinger <python@rcn.com>
parents:
34812
diff
changeset
|
3678 setattr(self, name, _copy.copy(getattr(DefaultContext, name))) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3679 else: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3680 setattr(self, name, val) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3681 del self.self |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3682 |
|
32487
fa23a9b18967
Fix clear_flags(). Make a readable (not evalable) Context repr.
Raymond Hettinger <python@rcn.com>
parents:
32482
diff
changeset
|
3683 def __repr__(self): |
|
32576
83cbc025bfc7
Improve Context construction and representation:
Raymond Hettinger <python@rcn.com>
parents:
32561
diff
changeset
|
3684 """Show the current context.""" |
|
32487
fa23a9b18967
Fix clear_flags(). Make a readable (not evalable) Context repr.
Raymond Hettinger <python@rcn.com>
parents:
32482
diff
changeset
|
3685 s = [] |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3686 s.append('Context(prec=%(prec)d, rounding=%(rounding)s, ' |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3687 'Emin=%(Emin)d, Emax=%(Emax)d, capitals=%(capitals)d' |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3688 % vars(self)) |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3689 names = [f.__name__ for f, v in self.flags.items() if v] |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3690 s.append('flags=[' + ', '.join(names) + ']') |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3691 names = [t.__name__ for t, v in self.traps.items() if v] |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3692 s.append('traps=[' + ', '.join(names) + ']') |
|
32487
fa23a9b18967
Fix clear_flags(). Make a readable (not evalable) Context repr.
Raymond Hettinger <python@rcn.com>
parents:
32482
diff
changeset
|
3693 return ', '.join(s) + ')' |
|
fa23a9b18967
Fix clear_flags(). Make a readable (not evalable) Context repr.
Raymond Hettinger <python@rcn.com>
parents:
32482
diff
changeset
|
3694 |
|
32477
bc586db9945a
Work through several open todos:
Raymond Hettinger <python@rcn.com>
parents:
32456
diff
changeset
|
3695 def clear_flags(self): |
|
bc586db9945a
Work through several open todos:
Raymond Hettinger <python@rcn.com>
parents:
32456
diff
changeset
|
3696 """Reset all flags to zero""" |
|
bc586db9945a
Work through several open todos:
Raymond Hettinger <python@rcn.com>
parents:
32456
diff
changeset
|
3697 for flag in self.flags: |
|
32487
fa23a9b18967
Fix clear_flags(). Make a readable (not evalable) Context repr.
Raymond Hettinger <python@rcn.com>
parents:
32482
diff
changeset
|
3698 self.flags[flag] = 0 |
|
32477
bc586db9945a
Work through several open todos:
Raymond Hettinger <python@rcn.com>
parents:
32456
diff
changeset
|
3699 |
|
33044
2749334d71a4
* Context.copy() now makes a deepcopy.
Raymond Hettinger <python@rcn.com>
parents:
32980
diff
changeset
|
3700 def _shallow_copy(self): |
|
2749334d71a4
* Context.copy() now makes a deepcopy.
Raymond Hettinger <python@rcn.com>
parents:
32980
diff
changeset
|
3701 """Returns a shallow copy from self.""" |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
3702 nc = Context(self.prec, self.rounding, self.traps, |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
3703 self.flags, self.Emin, self.Emax, |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
3704 self.capitals, self._clamp, self._ignored_flags) |
|
33044
2749334d71a4
* Context.copy() now makes a deepcopy.
Raymond Hettinger <python@rcn.com>
parents:
32980
diff
changeset
|
3705 return nc |
|
2749334d71a4
* Context.copy() now makes a deepcopy.
Raymond Hettinger <python@rcn.com>
parents:
32980
diff
changeset
|
3706 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3707 def copy(self): |
|
33044
2749334d71a4
* Context.copy() now makes a deepcopy.
Raymond Hettinger <python@rcn.com>
parents:
32980
diff
changeset
|
3708 """Returns a deep copy from self.""" |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3709 nc = Context(self.prec, self.rounding, self.traps.copy(), |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
3710 self.flags.copy(), self.Emin, self.Emax, |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
3711 self.capitals, self._clamp, self._ignored_flags) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3712 return nc |
| 32482 | 3713 __copy__ = copy |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3714 |
| 32560 | 3715 def _raise_error(self, condition, explanation = None, *args): |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3716 """Handles an error |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3717 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3718 If the flag is in _ignored_flags, returns the default response. |
|
46643
ec09ad5bed1a
Backport Raymond's changes in r60508 to Python 2.6.
Mark Dickinson <dickinsm@gmail.com>
parents:
46625
diff
changeset
|
3719 Otherwise, it sets the flag, then, if the corresponding |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3720 trap_enabler is set, it reaises the exception. Otherwise, it returns |
|
46643
ec09ad5bed1a
Backport Raymond's changes in r60508 to Python 2.6.
Mark Dickinson <dickinsm@gmail.com>
parents:
46625
diff
changeset
|
3721 the default value after setting the flag. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3722 """ |
| 32560 | 3723 error = _condition_map.get(condition, condition) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3724 if error in self._ignored_flags: |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3725 # Don't touch the flag |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3726 return error().handle(self, *args) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3727 |
|
46643
ec09ad5bed1a
Backport Raymond's changes in r60508 to Python 2.6.
Mark Dickinson <dickinsm@gmail.com>
parents:
46625
diff
changeset
|
3728 self.flags[error] = 1 |
|
32576
83cbc025bfc7
Improve Context construction and representation:
Raymond Hettinger <python@rcn.com>
parents:
32561
diff
changeset
|
3729 if not self.traps[error]: |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3730 # The errors define how to handle themselves. |
| 32560 | 3731 return condition().handle(self, *args) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3732 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3733 # Errors should only be risked on copies of the context |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3734 # self._ignored_flags = [] |
|
46651
c97e36abcdd5
Some very minor changes to decimal.py in Python 2.6, aimed
Mark Dickinson <dickinsm@gmail.com>
parents:
46643
diff
changeset
|
3735 raise error(explanation) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3736 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3737 def _ignore_all_flags(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3738 """Ignore all flags, if they are raised""" |
|
32666
c13d911ae05b
* Rename "Signals" to "_signals" making it non-public.
Raymond Hettinger <python@rcn.com>
parents:
32576
diff
changeset
|
3739 return self._ignore_flags(*_signals) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3740 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3741 def _ignore_flags(self, *flags): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3742 """Ignore the flags, if they are raised""" |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3743 # Do not mutate-- This way, copies of a context leave the original |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3744 # alone. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3745 self._ignored_flags = (self._ignored_flags + list(flags)) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3746 return list(flags) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3747 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3748 def _regard_flags(self, *flags): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3749 """Stop ignoring the flags, if they are raised""" |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3750 if flags and isinstance(flags[0], (tuple,list)): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3751 flags = flags[0] |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3752 for flag in flags: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3753 self._ignored_flags.remove(flag) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3754 |
|
47961
f9b80a820a25
Issue 2235: __hash__ is once again inherited by default, but inheritance can be blocked explicitly so that collections.Hashable remains meaningful
Nick Coghlan <ncoghlan@gmail.com>
parents:
47872
diff
changeset
|
3755 # We inherit object.__hash__, so we must deny this explicitly |
|
f9b80a820a25
Issue 2235: __hash__ is once again inherited by default, but inheritance can be blocked explicitly so that collections.Hashable remains meaningful
Nick Coghlan <ncoghlan@gmail.com>
parents:
47872
diff
changeset
|
3756 __hash__ = None |
| 32560 | 3757 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3758 def Etiny(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3759 """Returns Etiny (= Emin - prec + 1)""" |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3760 return int(self.Emin - self.prec + 1) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3761 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3762 def Etop(self): |
| 32496 | 3763 """Returns maximum exponent (= Emax - prec + 1)""" |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3764 return int(self.Emax - self.prec + 1) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3765 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3766 def _set_rounding(self, type): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3767 """Sets the rounding type. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3768 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3769 Sets the rounding type, and returns the current (previous) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3770 rounding type. Often used like: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3771 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3772 context = context.copy() |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3773 # so you don't change the calling context |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3774 # if an error occurs in the middle. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3775 rounding = context._set_rounding(ROUND_UP) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3776 val = self.__sub__(other, context=context) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3777 context._set_rounding(rounding) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3778 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3779 This will make it round up for that operation. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3780 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3781 rounding = self.rounding |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3782 self.rounding= type |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3783 return rounding |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3784 |
|
32666
c13d911ae05b
* Rename "Signals" to "_signals" making it non-public.
Raymond Hettinger <python@rcn.com>
parents:
32576
diff
changeset
|
3785 def create_decimal(self, num='0'): |
|
44650
7b798548a4ad
Issue 1780: Allow leading and trailing whitespace in Decimal constructor,
Mark Dickinson <dickinsm@gmail.com>
parents:
44631
diff
changeset
|
3786 """Creates a new Decimal instance but using self as context. |
|
7b798548a4ad
Issue 1780: Allow leading and trailing whitespace in Decimal constructor,
Mark Dickinson <dickinsm@gmail.com>
parents:
44631
diff
changeset
|
3787 |
|
7b798548a4ad
Issue 1780: Allow leading and trailing whitespace in Decimal constructor,
Mark Dickinson <dickinsm@gmail.com>
parents:
44631
diff
changeset
|
3788 This method implements the to-number operation of the |
|
7b798548a4ad
Issue 1780: Allow leading and trailing whitespace in Decimal constructor,
Mark Dickinson <dickinsm@gmail.com>
parents:
44631
diff
changeset
|
3789 IBM Decimal specification.""" |
|
7b798548a4ad
Issue 1780: Allow leading and trailing whitespace in Decimal constructor,
Mark Dickinson <dickinsm@gmail.com>
parents:
44631
diff
changeset
|
3790 |
|
7b798548a4ad
Issue 1780: Allow leading and trailing whitespace in Decimal constructor,
Mark Dickinson <dickinsm@gmail.com>
parents:
44631
diff
changeset
|
3791 if isinstance(num, basestring) and num != num.strip(): |
|
7b798548a4ad
Issue 1780: Allow leading and trailing whitespace in Decimal constructor,
Mark Dickinson <dickinsm@gmail.com>
parents:
44631
diff
changeset
|
3792 return self._raise_error(ConversionSyntax, |
|
7b798548a4ad
Issue 1780: Allow leading and trailing whitespace in Decimal constructor,
Mark Dickinson <dickinsm@gmail.com>
parents:
44631
diff
changeset
|
3793 "no trailing or leading whitespace is " |
|
7b798548a4ad
Issue 1780: Allow leading and trailing whitespace in Decimal constructor,
Mark Dickinson <dickinsm@gmail.com>
parents:
44631
diff
changeset
|
3794 "permitted.") |
|
7b798548a4ad
Issue 1780: Allow leading and trailing whitespace in Decimal constructor,
Mark Dickinson <dickinsm@gmail.com>
parents:
44631
diff
changeset
|
3795 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3796 d = Decimal(num, context=self) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3797 if d._isnan() and len(d._int) > self.prec - self._clamp: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3798 return self._raise_error(ConversionSyntax, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3799 "diagnostic info too long in NaN") |
| 33695 | 3800 return d._fix(self) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3801 |
|
50496
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3802 def create_decimal_from_float(self, f): |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3803 """Creates a new Decimal instance from a float but rounding using self |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3804 as the context. |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3805 |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3806 >>> context = Context(prec=5, rounding=ROUND_DOWN) |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3807 >>> context.create_decimal_from_float(3.1415926535897932) |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3808 Decimal('3.1415') |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3809 >>> context = Context(prec=5, traps=[Inexact]) |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3810 >>> context.create_decimal_from_float(3.1415926535897932) |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3811 Traceback (most recent call last): |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3812 ... |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3813 Inexact: None |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3814 |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3815 """ |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3816 d = Decimal.from_float(f) # An exact conversion |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3817 return d._fix(self) # Apply the context rounding |
|
7a6e3bc60ba6
Issue 4796: Add from_float methods to the decimal module.
Raymond Hettinger <python@rcn.com>
parents:
50480
diff
changeset
|
3818 |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3819 # Methods |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3820 def abs(self, a): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3821 """Returns the absolute value of the operand. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3822 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3823 If the operand is negative, the result is the same as using the minus |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
3824 operation on the operand. Otherwise, the result is the same as using |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3825 the plus operation on the operand. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3826 |
| 32482 | 3827 >>> ExtendedContext.abs(Decimal('2.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3828 Decimal('2.1') |
| 32482 | 3829 >>> ExtendedContext.abs(Decimal('-100')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3830 Decimal('100') |
| 32482 | 3831 >>> ExtendedContext.abs(Decimal('101.5')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3832 Decimal('101.5') |
| 32482 | 3833 >>> ExtendedContext.abs(Decimal('-101.5')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3834 Decimal('101.5') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3835 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3836 return a.__abs__(context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3837 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3838 def add(self, a, b): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3839 """Return the sum of the two operands. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3840 |
| 32482 | 3841 >>> ExtendedContext.add(Decimal('12'), Decimal('7.00')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3842 Decimal('19.00') |
| 32482 | 3843 >>> ExtendedContext.add(Decimal('1E+2'), Decimal('1.01E+4')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3844 Decimal('1.02E+4') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3845 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3846 return a.__add__(b, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3847 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3848 def _apply(self, a): |
| 33695 | 3849 return str(a._fix(self)) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3850 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3851 def canonical(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3852 """Returns the same Decimal object. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3853 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3854 As we do not have different encodings for the same number, the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3855 received object already is in its canonical form. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3856 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3857 >>> ExtendedContext.canonical(Decimal('2.50')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3858 Decimal('2.50') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3859 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3860 return a.canonical(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3861 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3862 def compare(self, a, b): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3863 """Compares values numerically. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3864 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3865 If the signs of the operands differ, a value representing each operand |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3866 ('-1' if the operand is less than zero, '0' if the operand is zero or |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3867 negative zero, or '1' if the operand is greater than zero) is used in |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3868 place of that operand for the comparison instead of the actual |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3869 operand. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3870 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3871 The comparison is then effected by subtracting the second operand from |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3872 the first and then returning a value according to the result of the |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3873 subtraction: '-1' if the result is less than zero, '0' if the result is |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3874 zero or negative zero, or '1' if the result is greater than zero. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3875 |
| 32482 | 3876 >>> ExtendedContext.compare(Decimal('2.1'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3877 Decimal('-1') |
| 32482 | 3878 >>> ExtendedContext.compare(Decimal('2.1'), Decimal('2.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3879 Decimal('0') |
| 32482 | 3880 >>> ExtendedContext.compare(Decimal('2.1'), Decimal('2.10')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3881 Decimal('0') |
| 32482 | 3882 >>> ExtendedContext.compare(Decimal('3'), Decimal('2.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3883 Decimal('1') |
| 32482 | 3884 >>> ExtendedContext.compare(Decimal('2.1'), Decimal('-3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3885 Decimal('1') |
| 32482 | 3886 >>> ExtendedContext.compare(Decimal('-3'), Decimal('2.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3887 Decimal('-1') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3888 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3889 return a.compare(b, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
3890 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3891 def compare_signal(self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3892 """Compares the values of the two operands numerically. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3893 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3894 It's pretty much like compare(), but all NaNs signal, with signaling |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3895 NaNs taking precedence over quiet NaNs. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3896 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3897 >>> c = ExtendedContext |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3898 >>> c.compare_signal(Decimal('2.1'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3899 Decimal('-1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3900 >>> c.compare_signal(Decimal('2.1'), Decimal('2.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3901 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3902 >>> c.flags[InvalidOperation] = 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3903 >>> print c.flags[InvalidOperation] |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3904 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3905 >>> c.compare_signal(Decimal('NaN'), Decimal('2.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3906 Decimal('NaN') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3907 >>> print c.flags[InvalidOperation] |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3908 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3909 >>> c.flags[InvalidOperation] = 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3910 >>> print c.flags[InvalidOperation] |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3911 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3912 >>> c.compare_signal(Decimal('sNaN'), Decimal('2.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3913 Decimal('NaN') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3914 >>> print c.flags[InvalidOperation] |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3915 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3916 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3917 return a.compare_signal(b, context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3918 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3919 def compare_total(self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3920 """Compares two operands using their abstract representation. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3921 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3922 This is not like the standard compare, which use their numerical |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3923 value. Note that a total ordering is defined for all possible abstract |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3924 representations. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3925 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3926 >>> ExtendedContext.compare_total(Decimal('12.73'), Decimal('127.9')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3927 Decimal('-1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3928 >>> ExtendedContext.compare_total(Decimal('-127'), Decimal('12')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3929 Decimal('-1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3930 >>> ExtendedContext.compare_total(Decimal('12.30'), Decimal('12.3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3931 Decimal('-1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3932 >>> ExtendedContext.compare_total(Decimal('12.30'), Decimal('12.30')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3933 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3934 >>> ExtendedContext.compare_total(Decimal('12.3'), Decimal('12.300')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3935 Decimal('1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3936 >>> ExtendedContext.compare_total(Decimal('12.3'), Decimal('NaN')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3937 Decimal('-1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3938 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3939 return a.compare_total(b) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3940 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3941 def compare_total_mag(self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3942 """Compares two operands using their abstract representation ignoring sign. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3943 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3944 Like compare_total, but with operand's sign ignored and assumed to be 0. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3945 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3946 return a.compare_total_mag(b) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3947 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3948 def copy_abs(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3949 """Returns a copy of the operand with the sign set to 0. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3950 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3951 >>> ExtendedContext.copy_abs(Decimal('2.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3952 Decimal('2.1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3953 >>> ExtendedContext.copy_abs(Decimal('-100')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3954 Decimal('100') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3955 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3956 return a.copy_abs() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3957 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3958 def copy_decimal(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3959 """Returns a copy of the decimal objet. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3960 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3961 >>> ExtendedContext.copy_decimal(Decimal('2.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3962 Decimal('2.1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
3963 >>> ExtendedContext.copy_decimal(Decimal('-1.00')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3964 Decimal('-1.00') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3965 """ |
|
43383
8890be9386b7
The methods always return Decimal classes, even if they're
Facundo Batista <facundobatista@gmail.com>
parents:
43362
diff
changeset
|
3966 return Decimal(a) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3967 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3968 def copy_negate(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3969 """Returns a copy of the operand with the sign inverted. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3970 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3971 >>> ExtendedContext.copy_negate(Decimal('101.5')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3972 Decimal('-101.5') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3973 >>> ExtendedContext.copy_negate(Decimal('-101.5')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
3974 Decimal('101.5') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3975 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3976 return a.copy_negate() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3977 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3978 def copy_sign(self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3979 """Copies the second operand's sign to the first one. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3980 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3981 In detail, it returns a copy of the first operand with the sign |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
3982 equal to the sign of the second operand. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3983 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3984 >>> ExtendedContext.copy_sign(Decimal( '1.50'), Decimal('7.33')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
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diff
changeset
|
3985 Decimal('1.50') |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3986 >>> ExtendedContext.copy_sign(Decimal('-1.50'), Decimal('7.33')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
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diff
changeset
|
3987 Decimal('1.50') |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
3988 >>> ExtendedContext.copy_sign(Decimal( '1.50'), Decimal('-7.33')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
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changeset
|
3989 Decimal('-1.50') |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
3990 >>> ExtendedContext.copy_sign(Decimal('-1.50'), Decimal('-7.33')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
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changeset
|
3991 Decimal('-1.50') |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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|
3992 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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|
3993 return a.copy_sign(b) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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|
3994 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
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parents:
diff
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|
3995 def divide(self, a, b): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
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|
3996 """Decimal division in a specified context. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
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|
3997 |
| 32482 | 3998 >>> ExtendedContext.divide(Decimal('1'), Decimal('3')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
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parents:
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|
3999 Decimal('0.333333333') |
| 32482 | 4000 >>> ExtendedContext.divide(Decimal('2'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
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|
4001 Decimal('0.666666667') |
| 32482 | 4002 >>> ExtendedContext.divide(Decimal('5'), Decimal('2')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
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parents:
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changeset
|
4003 Decimal('2.5') |
| 32482 | 4004 >>> ExtendedContext.divide(Decimal('1'), Decimal('10')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
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parents:
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changeset
|
4005 Decimal('0.1') |
| 32482 | 4006 >>> ExtendedContext.divide(Decimal('12'), Decimal('12')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
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changeset
|
4007 Decimal('1') |
| 32482 | 4008 >>> ExtendedContext.divide(Decimal('8.00'), Decimal('2')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
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parents:
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changeset
|
4009 Decimal('4.00') |
| 32482 | 4010 >>> ExtendedContext.divide(Decimal('2.400'), Decimal('2.0')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
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|
4011 Decimal('1.20') |
| 32482 | 4012 >>> ExtendedContext.divide(Decimal('1000'), Decimal('100')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
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parents:
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changeset
|
4013 Decimal('10') |
| 32482 | 4014 >>> ExtendedContext.divide(Decimal('1000'), Decimal('1')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
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parents:
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|
4015 Decimal('1000') |
| 32482 | 4016 >>> ExtendedContext.divide(Decimal('2.40E+6'), Decimal('2')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
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|
4017 Decimal('1.20E+6') |
|
32451
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Move Decimal from the sandbox into production.
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diff
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|
4018 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
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diff
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|
4019 return a.__div__(b, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4020 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
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diff
changeset
|
4021 def divide_int(self, a, b): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4022 """Divides two numbers and returns the integer part of the result. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
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|
4023 |
| 32482 | 4024 >>> ExtendedContext.divide_int(Decimal('2'), Decimal('3')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
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changeset
|
4025 Decimal('0') |
| 32482 | 4026 >>> ExtendedContext.divide_int(Decimal('10'), Decimal('3')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
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changeset
|
4027 Decimal('3') |
| 32482 | 4028 >>> ExtendedContext.divide_int(Decimal('1'), Decimal('0.3')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
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parents:
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changeset
|
4029 Decimal('3') |
|
32451
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Move Decimal from the sandbox into production.
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diff
changeset
|
4030 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
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diff
changeset
|
4031 return a.__floordiv__(b, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
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diff
changeset
|
4032 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
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changeset
|
4033 def divmod(self, a, b): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4034 return a.__divmod__(b, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4035 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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changeset
|
4036 def exp(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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changeset
|
4037 """Returns e ** a. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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changeset
|
4038 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4039 >>> c = ExtendedContext.copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4040 >>> c.Emin = -999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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changeset
|
4041 >>> c.Emax = 999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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changeset
|
4042 >>> c.exp(Decimal('-Infinity')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
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changeset
|
4043 Decimal('0') |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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changeset
|
4044 >>> c.exp(Decimal('-1')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
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diff
changeset
|
4045 Decimal('0.367879441') |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4046 >>> c.exp(Decimal('0')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
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changeset
|
4047 Decimal('1') |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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changeset
|
4048 >>> c.exp(Decimal('1')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
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diff
changeset
|
4049 Decimal('2.71828183') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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changeset
|
4050 >>> c.exp(Decimal('0.693147181')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
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changeset
|
4051 Decimal('2.00000000') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4052 >>> c.exp(Decimal('+Infinity')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
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diff
changeset
|
4053 Decimal('Infinity') |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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changeset
|
4054 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4055 return a.exp(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4056 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4057 def fma(self, a, b, c): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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changeset
|
4058 """Returns a multiplied by b, plus c. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4059 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4060 The first two operands are multiplied together, using multiply, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4061 the third operand is then added to the result of that |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4062 multiplication, using add, all with only one final rounding. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4063 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4064 >>> ExtendedContext.fma(Decimal('3'), Decimal('5'), Decimal('7')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4065 Decimal('22') |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4066 >>> ExtendedContext.fma(Decimal('3'), Decimal('-5'), Decimal('7')) |
|
45321
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Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4067 Decimal('-8') |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4068 >>> ExtendedContext.fma(Decimal('888565290'), Decimal('1557.96930'), Decimal('-86087.7578')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
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changeset
|
4069 Decimal('1.38435736E+12') |
|
43360
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Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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changeset
|
4070 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4071 return a.fma(b, c, context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
4072 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
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changeset
|
4073 def is_canonical(self, a): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
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diff
changeset
|
4074 """Return True if the operand is canonical; otherwise return False. |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
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parents:
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diff
changeset
|
4075 |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
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parents:
43409
diff
changeset
|
4076 Currently, the encoding of a Decimal instance is always |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
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parents:
43409
diff
changeset
|
4077 canonical, so this method returns True for any Decimal. |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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diff
changeset
|
4078 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
4079 >>> ExtendedContext.is_canonical(Decimal('2.50')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
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parents:
43409
diff
changeset
|
4080 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
4081 """ |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
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parents:
43409
diff
changeset
|
4082 return a.is_canonical() |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
4083 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
4084 def is_finite(self, a): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
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43409
diff
changeset
|
4085 """Return True if the operand is finite; otherwise return False. |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
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diff
changeset
|
4086 |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
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43409
diff
changeset
|
4087 A Decimal instance is considered finite if it is neither |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
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43409
diff
changeset
|
4088 infinite nor a NaN. |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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changeset
|
4089 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
4090 >>> ExtendedContext.is_finite(Decimal('2.50')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4091 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
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diff
changeset
|
4092 >>> ExtendedContext.is_finite(Decimal('-0.3')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4093 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4094 >>> ExtendedContext.is_finite(Decimal('0')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4095 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4096 >>> ExtendedContext.is_finite(Decimal('Inf')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4097 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4098 >>> ExtendedContext.is_finite(Decimal('NaN')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4099 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4100 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4101 return a.is_finite() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4102 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4103 def is_infinite(self, a): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4104 """Return True if the operand is infinite; otherwise return False. |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4105 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4106 >>> ExtendedContext.is_infinite(Decimal('2.50')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4107 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4108 >>> ExtendedContext.is_infinite(Decimal('-Inf')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4109 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4110 >>> ExtendedContext.is_infinite(Decimal('NaN')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4111 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4112 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4113 return a.is_infinite() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4114 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4115 def is_nan(self, a): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4116 """Return True if the operand is a qNaN or sNaN; |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4117 otherwise return False. |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4118 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4119 >>> ExtendedContext.is_nan(Decimal('2.50')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4120 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4121 >>> ExtendedContext.is_nan(Decimal('NaN')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4122 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4123 >>> ExtendedContext.is_nan(Decimal('-sNaN')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4124 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4125 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4126 return a.is_nan() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4127 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4128 def is_normal(self, a): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4129 """Return True if the operand is a normal number; |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4130 otherwise return False. |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4131 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4132 >>> c = ExtendedContext.copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4133 >>> c.Emin = -999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4134 >>> c.Emax = 999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4135 >>> c.is_normal(Decimal('2.50')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4136 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4137 >>> c.is_normal(Decimal('0.1E-999')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4138 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4139 >>> c.is_normal(Decimal('0.00')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4140 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4141 >>> c.is_normal(Decimal('-Inf')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4142 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4143 >>> c.is_normal(Decimal('NaN')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4144 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4145 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4146 return a.is_normal(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4147 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4148 def is_qnan(self, a): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4149 """Return True if the operand is a quiet NaN; otherwise return False. |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4150 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4151 >>> ExtendedContext.is_qnan(Decimal('2.50')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4152 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4153 >>> ExtendedContext.is_qnan(Decimal('NaN')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4154 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4155 >>> ExtendedContext.is_qnan(Decimal('sNaN')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4156 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4157 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4158 return a.is_qnan() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4159 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4160 def is_signed(self, a): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4161 """Return True if the operand is negative; otherwise return False. |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4162 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4163 >>> ExtendedContext.is_signed(Decimal('2.50')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4164 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4165 >>> ExtendedContext.is_signed(Decimal('-12')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4166 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4167 >>> ExtendedContext.is_signed(Decimal('-0')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4168 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4169 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4170 return a.is_signed() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4171 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4172 def is_snan(self, a): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4173 """Return True if the operand is a signaling NaN; |
|
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4174 otherwise return False. |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4175 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4176 >>> ExtendedContext.is_snan(Decimal('2.50')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4177 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4178 >>> ExtendedContext.is_snan(Decimal('NaN')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4179 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4180 >>> ExtendedContext.is_snan(Decimal('sNaN')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4181 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4182 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4183 return a.is_snan() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4184 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4185 def is_subnormal(self, a): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4186 """Return True if the operand is subnormal; otherwise return False. |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4187 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4188 >>> c = ExtendedContext.copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4189 >>> c.Emin = -999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4190 >>> c.Emax = 999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4191 >>> c.is_subnormal(Decimal('2.50')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4192 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4193 >>> c.is_subnormal(Decimal('0.1E-999')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4194 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4195 >>> c.is_subnormal(Decimal('0.00')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4196 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4197 >>> c.is_subnormal(Decimal('-Inf')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4198 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4199 >>> c.is_subnormal(Decimal('NaN')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4200 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4201 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4202 return a.is_subnormal(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4203 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4204 def is_zero(self, a): |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4205 """Return True if the operand is a zero; otherwise return False. |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4206 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4207 >>> ExtendedContext.is_zero(Decimal('0')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4208 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4209 >>> ExtendedContext.is_zero(Decimal('2.50')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4210 False |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4211 >>> ExtendedContext.is_zero(Decimal('-0E+2')) |
|
43454
9d6d9ac95ae1
Made the various is_* operations return booleans. This was discussed
Facundo Batista <facundobatista@gmail.com>
parents:
43409
diff
changeset
|
4212 True |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4213 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4214 return a.is_zero() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4215 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4216 def ln(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4217 """Returns the natural (base e) logarithm of the operand. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4218 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4219 >>> c = ExtendedContext.copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4220 >>> c.Emin = -999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4221 >>> c.Emax = 999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4222 >>> c.ln(Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4223 Decimal('-Infinity') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4224 >>> c.ln(Decimal('1.000')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4225 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4226 >>> c.ln(Decimal('2.71828183')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4227 Decimal('1.00000000') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4228 >>> c.ln(Decimal('10')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4229 Decimal('2.30258509') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4230 >>> c.ln(Decimal('+Infinity')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4231 Decimal('Infinity') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4232 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4233 return a.ln(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4234 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4235 def log10(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4236 """Returns the base 10 logarithm of the operand. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4237 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4238 >>> c = ExtendedContext.copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4239 >>> c.Emin = -999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4240 >>> c.Emax = 999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4241 >>> c.log10(Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4242 Decimal('-Infinity') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4243 >>> c.log10(Decimal('0.001')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4244 Decimal('-3') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4245 >>> c.log10(Decimal('1.000')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4246 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4247 >>> c.log10(Decimal('2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4248 Decimal('0.301029996') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4249 >>> c.log10(Decimal('10')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4250 Decimal('1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4251 >>> c.log10(Decimal('70')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4252 Decimal('1.84509804') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4253 >>> c.log10(Decimal('+Infinity')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4254 Decimal('Infinity') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4255 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4256 return a.log10(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4257 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4258 def logb(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4259 """ Returns the exponent of the magnitude of the operand's MSD. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4260 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4261 The result is the integer which is the exponent of the magnitude |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4262 of the most significant digit of the operand (as though the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4263 operand were truncated to a single digit while maintaining the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4264 value of that digit and without limiting the resulting exponent). |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4265 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4266 >>> ExtendedContext.logb(Decimal('250')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4267 Decimal('2') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4268 >>> ExtendedContext.logb(Decimal('2.50')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4269 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4270 >>> ExtendedContext.logb(Decimal('0.03')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4271 Decimal('-2') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4272 >>> ExtendedContext.logb(Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4273 Decimal('-Infinity') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4274 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4275 return a.logb(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4276 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4277 def logical_and(self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4278 """Applies the logical operation 'and' between each operand's digits. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4279 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4280 The operands must be both logical numbers. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4281 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4282 >>> ExtendedContext.logical_and(Decimal('0'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4283 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4284 >>> ExtendedContext.logical_and(Decimal('0'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4285 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4286 >>> ExtendedContext.logical_and(Decimal('1'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4287 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
4288 >>> ExtendedContext.logical_and(Decimal('1'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4289 Decimal('1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4290 >>> ExtendedContext.logical_and(Decimal('1100'), Decimal('1010')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4291 Decimal('1000') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4292 >>> ExtendedContext.logical_and(Decimal('1111'), Decimal('10')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4293 Decimal('10') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4294 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4295 return a.logical_and(b, context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4296 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4297 def logical_invert(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4298 """Invert all the digits in the operand. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4299 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4300 The operand must be a logical number. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4301 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4302 >>> ExtendedContext.logical_invert(Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4303 Decimal('111111111') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4304 >>> ExtendedContext.logical_invert(Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4305 Decimal('111111110') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4306 >>> ExtendedContext.logical_invert(Decimal('111111111')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4307 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4308 >>> ExtendedContext.logical_invert(Decimal('101010101')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4309 Decimal('10101010') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4310 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4311 return a.logical_invert(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4312 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4313 def logical_or(self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4314 """Applies the logical operation 'or' between each operand's digits. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4315 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4316 The operands must be both logical numbers. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4317 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4318 >>> ExtendedContext.logical_or(Decimal('0'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4319 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4320 >>> ExtendedContext.logical_or(Decimal('0'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4321 Decimal('1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4322 >>> ExtendedContext.logical_or(Decimal('1'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4323 Decimal('1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4324 >>> ExtendedContext.logical_or(Decimal('1'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4325 Decimal('1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4326 >>> ExtendedContext.logical_or(Decimal('1100'), Decimal('1010')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4327 Decimal('1110') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4328 >>> ExtendedContext.logical_or(Decimal('1110'), Decimal('10')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4329 Decimal('1110') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4330 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4331 return a.logical_or(b, context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4332 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4333 def logical_xor(self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4334 """Applies the logical operation 'xor' between each operand's digits. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4335 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4336 The operands must be both logical numbers. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4337 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4338 >>> ExtendedContext.logical_xor(Decimal('0'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4339 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4340 >>> ExtendedContext.logical_xor(Decimal('0'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4341 Decimal('1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4342 >>> ExtendedContext.logical_xor(Decimal('1'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4343 Decimal('1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4344 >>> ExtendedContext.logical_xor(Decimal('1'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4345 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4346 >>> ExtendedContext.logical_xor(Decimal('1100'), Decimal('1010')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4347 Decimal('110') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4348 >>> ExtendedContext.logical_xor(Decimal('1111'), Decimal('10')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4349 Decimal('1101') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4350 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4351 return a.logical_xor(b, context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4352 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4353 def max(self, a,b): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4354 """max compares two values numerically and returns the maximum. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4355 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4356 If either operand is a NaN then the general rules apply. |
| 44701 | 4357 Otherwise, the operands are compared as though by the compare |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4358 operation. If they are numerically equal then the left-hand operand |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4359 is chosen as the result. Otherwise the maximum (closer to positive |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4360 infinity) of the two operands is chosen as the result. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4361 |
| 32482 | 4362 >>> ExtendedContext.max(Decimal('3'), Decimal('2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4363 Decimal('3') |
| 32482 | 4364 >>> ExtendedContext.max(Decimal('-10'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4365 Decimal('3') |
| 32482 | 4366 >>> ExtendedContext.max(Decimal('1.0'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4367 Decimal('1') |
|
33157
b2f427db228b
Revise max() and min() to comply with the 8/2/2004 update to the specification
Raymond Hettinger <python@rcn.com>
parents:
33044
diff
changeset
|
4368 >>> ExtendedContext.max(Decimal('7'), Decimal('NaN')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4369 Decimal('7') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4370 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4371 return a.max(b, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4372 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4373 def max_mag(self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4374 """Compares the values numerically with their sign ignored.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4375 return a.max_mag(b, context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4376 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4377 def min(self, a,b): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4378 """min compares two values numerically and returns the minimum. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4379 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4380 If either operand is a NaN then the general rules apply. |
| 44701 | 4381 Otherwise, the operands are compared as though by the compare |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4382 operation. If they are numerically equal then the left-hand operand |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4383 is chosen as the result. Otherwise the minimum (closer to negative |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4384 infinity) of the two operands is chosen as the result. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4385 |
| 32482 | 4386 >>> ExtendedContext.min(Decimal('3'), Decimal('2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4387 Decimal('2') |
| 32482 | 4388 >>> ExtendedContext.min(Decimal('-10'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4389 Decimal('-10') |
| 32482 | 4390 >>> ExtendedContext.min(Decimal('1.0'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4391 Decimal('1.0') |
|
33157
b2f427db228b
Revise max() and min() to comply with the 8/2/2004 update to the specification
Raymond Hettinger <python@rcn.com>
parents:
33044
diff
changeset
|
4392 >>> ExtendedContext.min(Decimal('7'), Decimal('NaN')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4393 Decimal('7') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4394 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4395 return a.min(b, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4396 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4397 def min_mag(self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4398 """Compares the values numerically with their sign ignored.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4399 return a.min_mag(b, context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4400 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4401 def minus(self, a): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4402 """Minus corresponds to unary prefix minus in Python. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4403 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4404 The operation is evaluated using the same rules as subtract; the |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4405 operation minus(a) is calculated as subtract('0', a) where the '0' |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4406 has the same exponent as the operand. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4407 |
| 32482 | 4408 >>> ExtendedContext.minus(Decimal('1.3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4409 Decimal('-1.3') |
| 32482 | 4410 >>> ExtendedContext.minus(Decimal('-1.3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4411 Decimal('1.3') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4412 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4413 return a.__neg__(context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4414 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4415 def multiply(self, a, b): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4416 """multiply multiplies two operands. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4417 |
|
39120
1d7da8608031
Revert r50706 (Whitespace normalization) and
Martin v. Löwis <martin@v.loewis.de>
parents:
39117
diff
changeset
|
4418 If either operand is a special value then the general rules apply. |
|
1d7da8608031
Revert r50706 (Whitespace normalization) and
Martin v. Löwis <martin@v.loewis.de>
parents:
39117
diff
changeset
|
4419 Otherwise, the operands are multiplied together ('long multiplication'), |
|
1d7da8608031
Revert r50706 (Whitespace normalization) and
Martin v. Löwis <martin@v.loewis.de>
parents:
39117
diff
changeset
|
4420 resulting in a number which may be as long as the sum of the lengths |
|
1d7da8608031
Revert r50706 (Whitespace normalization) and
Martin v. Löwis <martin@v.loewis.de>
parents:
39117
diff
changeset
|
4421 of the two operands. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4422 |
| 32482 | 4423 >>> ExtendedContext.multiply(Decimal('1.20'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4424 Decimal('3.60') |
| 32482 | 4425 >>> ExtendedContext.multiply(Decimal('7'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4426 Decimal('21') |
| 32482 | 4427 >>> ExtendedContext.multiply(Decimal('0.9'), Decimal('0.8')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4428 Decimal('0.72') |
| 32482 | 4429 >>> ExtendedContext.multiply(Decimal('0.9'), Decimal('-0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4430 Decimal('-0.0') |
| 32482 | 4431 >>> ExtendedContext.multiply(Decimal('654321'), Decimal('654321')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4432 Decimal('4.28135971E+11') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4433 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4434 return a.__mul__(b, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4435 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4436 def next_minus(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4437 """Returns the largest representable number smaller than a. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4438 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4439 >>> c = ExtendedContext.copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4440 >>> c.Emin = -999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4441 >>> c.Emax = 999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4442 >>> ExtendedContext.next_minus(Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4443 Decimal('0.999999999') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4444 >>> c.next_minus(Decimal('1E-1007')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4445 Decimal('0E-1007') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4446 >>> ExtendedContext.next_minus(Decimal('-1.00000003')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4447 Decimal('-1.00000004') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4448 >>> c.next_minus(Decimal('Infinity')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4449 Decimal('9.99999999E+999') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4450 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4451 return a.next_minus(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4452 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4453 def next_plus(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4454 """Returns the smallest representable number larger than a. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4455 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4456 >>> c = ExtendedContext.copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4457 >>> c.Emin = -999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4458 >>> c.Emax = 999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4459 >>> ExtendedContext.next_plus(Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4460 Decimal('1.00000001') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4461 >>> c.next_plus(Decimal('-1E-1007')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4462 Decimal('-0E-1007') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4463 >>> ExtendedContext.next_plus(Decimal('-1.00000003')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4464 Decimal('-1.00000002') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4465 >>> c.next_plus(Decimal('-Infinity')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4466 Decimal('-9.99999999E+999') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4467 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4468 return a.next_plus(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4469 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4470 def next_toward(self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4471 """Returns the number closest to a, in direction towards b. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4472 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4473 The result is the closest representable number from the first |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4474 operand (but not the first operand) that is in the direction |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4475 towards the second operand, unless the operands have the same |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4476 value. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4477 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4478 >>> c = ExtendedContext.copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4479 >>> c.Emin = -999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4480 >>> c.Emax = 999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4481 >>> c.next_toward(Decimal('1'), Decimal('2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4482 Decimal('1.00000001') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4483 >>> c.next_toward(Decimal('-1E-1007'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4484 Decimal('-0E-1007') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4485 >>> c.next_toward(Decimal('-1.00000003'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4486 Decimal('-1.00000002') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4487 >>> c.next_toward(Decimal('1'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4488 Decimal('0.999999999') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4489 >>> c.next_toward(Decimal('1E-1007'), Decimal('-100')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4490 Decimal('0E-1007') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4491 >>> c.next_toward(Decimal('-1.00000003'), Decimal('-10')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4492 Decimal('-1.00000004') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4493 >>> c.next_toward(Decimal('0.00'), Decimal('-0.0000')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4494 Decimal('-0.00') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4495 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4496 return a.next_toward(b, context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4497 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4498 def normalize(self, a): |
| 32496 | 4499 """normalize reduces an operand to its simplest form. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4500 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4501 Essentially a plus operation with all trailing zeros removed from the |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4502 result. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4503 |
| 32482 | 4504 >>> ExtendedContext.normalize(Decimal('2.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4505 Decimal('2.1') |
| 32482 | 4506 >>> ExtendedContext.normalize(Decimal('-2.0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4507 Decimal('-2') |
| 32482 | 4508 >>> ExtendedContext.normalize(Decimal('1.200')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4509 Decimal('1.2') |
| 32482 | 4510 >>> ExtendedContext.normalize(Decimal('-120')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4511 Decimal('-1.2E+2') |
| 32482 | 4512 >>> ExtendedContext.normalize(Decimal('120.00')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4513 Decimal('1.2E+2') |
| 32482 | 4514 >>> ExtendedContext.normalize(Decimal('0.00')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4515 Decimal('0') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4516 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4517 return a.normalize(context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4518 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4519 def number_class(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4520 """Returns an indication of the class of the operand. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4521 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4522 The class is one of the following strings: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4523 -sNaN |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4524 -NaN |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4525 -Infinity |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4526 -Normal |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4527 -Subnormal |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4528 -Zero |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4529 +Zero |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4530 +Subnormal |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4531 +Normal |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4532 +Infinity |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4533 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4534 >>> c = Context(ExtendedContext) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4535 >>> c.Emin = -999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4536 >>> c.Emax = 999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4537 >>> c.number_class(Decimal('Infinity')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4538 '+Infinity' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4539 >>> c.number_class(Decimal('1E-10')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4540 '+Normal' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4541 >>> c.number_class(Decimal('2.50')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4542 '+Normal' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4543 >>> c.number_class(Decimal('0.1E-999')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4544 '+Subnormal' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4545 >>> c.number_class(Decimal('0')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4546 '+Zero' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4547 >>> c.number_class(Decimal('-0')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4548 '-Zero' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4549 >>> c.number_class(Decimal('-0.1E-999')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4550 '-Subnormal' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4551 >>> c.number_class(Decimal('-1E-10')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4552 '-Normal' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4553 >>> c.number_class(Decimal('-2.50')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4554 '-Normal' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4555 >>> c.number_class(Decimal('-Infinity')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4556 '-Infinity' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4557 >>> c.number_class(Decimal('NaN')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4558 'NaN' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4559 >>> c.number_class(Decimal('-NaN')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4560 'NaN' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4561 >>> c.number_class(Decimal('sNaN')) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4562 'sNaN' |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4563 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4564 return a.number_class(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4565 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4566 def plus(self, a): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4567 """Plus corresponds to unary prefix plus in Python. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4568 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4569 The operation is evaluated using the same rules as add; the |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4570 operation plus(a) is calculated as add('0', a) where the '0' |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4571 has the same exponent as the operand. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4572 |
| 32482 | 4573 >>> ExtendedContext.plus(Decimal('1.3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4574 Decimal('1.3') |
| 32482 | 4575 >>> ExtendedContext.plus(Decimal('-1.3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4576 Decimal('-1.3') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4577 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4578 return a.__pos__(context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4579 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4580 def power(self, a, b, modulo=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4581 """Raises a to the power of b, to modulo if given. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4582 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4583 With two arguments, compute a**b. If a is negative then b |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4584 must be integral. The result will be inexact unless b is |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4585 integral and the result is finite and can be expressed exactly |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4586 in 'precision' digits. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4587 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4588 With three arguments, compute (a**b) % modulo. For the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4589 three argument form, the following restrictions on the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4590 arguments hold: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4591 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4592 - all three arguments must be integral |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4593 - b must be nonnegative |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4594 - at least one of a or b must be nonzero |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4595 - modulo must be nonzero and have at most 'precision' digits |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4596 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4597 The result of pow(a, b, modulo) is identical to the result |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4598 that would be obtained by computing (a**b) % modulo with |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4599 unbounded precision, but is computed more efficiently. It is |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4600 always exact. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4601 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4602 >>> c = ExtendedContext.copy() |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4603 >>> c.Emin = -999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4604 >>> c.Emax = 999 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4605 >>> c.power(Decimal('2'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4606 Decimal('8') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4607 >>> c.power(Decimal('-2'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4608 Decimal('-8') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4609 >>> c.power(Decimal('2'), Decimal('-3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4610 Decimal('0.125') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4611 >>> c.power(Decimal('1.7'), Decimal('8')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4612 Decimal('69.7575744') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4613 >>> c.power(Decimal('10'), Decimal('0.301029996')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4614 Decimal('2.00000000') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4615 >>> c.power(Decimal('Infinity'), Decimal('-1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4616 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4617 >>> c.power(Decimal('Infinity'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4618 Decimal('1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4619 >>> c.power(Decimal('Infinity'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4620 Decimal('Infinity') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4621 >>> c.power(Decimal('-Infinity'), Decimal('-1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4622 Decimal('-0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4623 >>> c.power(Decimal('-Infinity'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4624 Decimal('1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4625 >>> c.power(Decimal('-Infinity'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4626 Decimal('-Infinity') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4627 >>> c.power(Decimal('-Infinity'), Decimal('2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4628 Decimal('Infinity') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4629 >>> c.power(Decimal('0'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4630 Decimal('NaN') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4631 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4632 >>> c.power(Decimal('3'), Decimal('7'), Decimal('16')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4633 Decimal('11') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4634 >>> c.power(Decimal('-3'), Decimal('7'), Decimal('16')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4635 Decimal('-11') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4636 >>> c.power(Decimal('-3'), Decimal('8'), Decimal('16')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4637 Decimal('1') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4638 >>> c.power(Decimal('3'), Decimal('7'), Decimal('-16')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4639 Decimal('11') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4640 >>> c.power(Decimal('23E12345'), Decimal('67E189'), Decimal('123456789')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4641 Decimal('11729830') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4642 >>> c.power(Decimal('-0'), Decimal('17'), Decimal('1729')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4643 Decimal('-0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4644 >>> c.power(Decimal('-23'), Decimal('0'), Decimal('65537')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4645 Decimal('1') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4646 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4647 return a.__pow__(b, modulo, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4648 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4649 def quantize(self, a, b): |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4650 """Returns a value equal to 'a' (rounded), having the exponent of 'b'. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4651 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4652 The coefficient of the result is derived from that of the left-hand |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4653 operand. It may be rounded using the current rounding setting (if the |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4654 exponent is being increased), multiplied by a positive power of ten (if |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4655 the exponent is being decreased), or is unchanged (if the exponent is |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4656 already equal to that of the right-hand operand). |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4657 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4658 Unlike other operations, if the length of the coefficient after the |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4659 quantize operation would be greater than precision then an Invalid |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4660 operation condition is raised. This guarantees that, unless there is |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4661 an error condition, the exponent of the result of a quantize is always |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4662 equal to that of the right-hand operand. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4663 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4664 Also unlike other operations, quantize will never raise Underflow, even |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4665 if the result is subnormal and inexact. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4666 |
| 32482 | 4667 >>> ExtendedContext.quantize(Decimal('2.17'), Decimal('0.001')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4668 Decimal('2.170') |
| 32482 | 4669 >>> ExtendedContext.quantize(Decimal('2.17'), Decimal('0.01')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4670 Decimal('2.17') |
| 32482 | 4671 >>> ExtendedContext.quantize(Decimal('2.17'), Decimal('0.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4672 Decimal('2.2') |
| 32482 | 4673 >>> ExtendedContext.quantize(Decimal('2.17'), Decimal('1e+0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4674 Decimal('2') |
| 32482 | 4675 >>> ExtendedContext.quantize(Decimal('2.17'), Decimal('1e+1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4676 Decimal('0E+1') |
| 32482 | 4677 >>> ExtendedContext.quantize(Decimal('-Inf'), Decimal('Infinity')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4678 Decimal('-Infinity') |
| 32482 | 4679 >>> ExtendedContext.quantize(Decimal('2'), Decimal('Infinity')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4680 Decimal('NaN') |
| 32482 | 4681 >>> ExtendedContext.quantize(Decimal('-0.1'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4682 Decimal('-0') |
| 32482 | 4683 >>> ExtendedContext.quantize(Decimal('-0'), Decimal('1e+5')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4684 Decimal('-0E+5') |
| 32482 | 4685 >>> ExtendedContext.quantize(Decimal('+35236450.6'), Decimal('1e-2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4686 Decimal('NaN') |
| 32482 | 4687 >>> ExtendedContext.quantize(Decimal('-35236450.6'), Decimal('1e-2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4688 Decimal('NaN') |
| 32482 | 4689 >>> ExtendedContext.quantize(Decimal('217'), Decimal('1e-1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4690 Decimal('217.0') |
| 32482 | 4691 >>> ExtendedContext.quantize(Decimal('217'), Decimal('1e-0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4692 Decimal('217') |
| 32482 | 4693 >>> ExtendedContext.quantize(Decimal('217'), Decimal('1e+1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4694 Decimal('2.2E+2') |
| 32482 | 4695 >>> ExtendedContext.quantize(Decimal('217'), Decimal('1e+2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4696 Decimal('2E+2') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4697 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4698 return a.quantize(b, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4699 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4700 def radix(self): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4701 """Just returns 10, as this is Decimal, :) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4702 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4703 >>> ExtendedContext.radix() |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4704 Decimal('10') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4705 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4706 return Decimal(10) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4707 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4708 def remainder(self, a, b): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4709 """Returns the remainder from integer division. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4710 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4711 The result is the residue of the dividend after the operation of |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4712 calculating integer division as described for divide-integer, rounded |
|
41532
4b9fa8092e82
Whitespace normalization. Ugh, we really need to do this more often.
Neal Norwitz <nnorwitz@gmail.com>
parents:
41418
diff
changeset
|
4713 to precision digits if necessary. The sign of the result, if |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4714 non-zero, is the same as that of the original dividend. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4715 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4716 This operation will fail under the same conditions as integer division |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4717 (that is, if integer division on the same two operands would fail, the |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4718 remainder cannot be calculated). |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4719 |
| 32482 | 4720 >>> ExtendedContext.remainder(Decimal('2.1'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4721 Decimal('2.1') |
| 32482 | 4722 >>> ExtendedContext.remainder(Decimal('10'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4723 Decimal('1') |
| 32482 | 4724 >>> ExtendedContext.remainder(Decimal('-10'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4725 Decimal('-1') |
| 32482 | 4726 >>> ExtendedContext.remainder(Decimal('10.2'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4727 Decimal('0.2') |
| 32482 | 4728 >>> ExtendedContext.remainder(Decimal('10'), Decimal('0.3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4729 Decimal('0.1') |
| 32482 | 4730 >>> ExtendedContext.remainder(Decimal('3.6'), Decimal('1.3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4731 Decimal('1.0') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4732 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4733 return a.__mod__(b, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4734 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4735 def remainder_near(self, a, b): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4736 """Returns to be "a - b * n", where n is the integer nearest the exact |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4737 value of "x / b" (if two integers are equally near then the even one |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4738 is chosen). If the result is equal to 0 then its sign will be the |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4739 sign of a. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4740 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4741 This operation will fail under the same conditions as integer division |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4742 (that is, if integer division on the same two operands would fail, the |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4743 remainder cannot be calculated). |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4744 |
| 32482 | 4745 >>> ExtendedContext.remainder_near(Decimal('2.1'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4746 Decimal('-0.9') |
| 32482 | 4747 >>> ExtendedContext.remainder_near(Decimal('10'), Decimal('6')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4748 Decimal('-2') |
| 32482 | 4749 >>> ExtendedContext.remainder_near(Decimal('10'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4750 Decimal('1') |
| 32482 | 4751 >>> ExtendedContext.remainder_near(Decimal('-10'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4752 Decimal('-1') |
| 32482 | 4753 >>> ExtendedContext.remainder_near(Decimal('10.2'), Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4754 Decimal('0.2') |
| 32482 | 4755 >>> ExtendedContext.remainder_near(Decimal('10'), Decimal('0.3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4756 Decimal('0.1') |
| 32482 | 4757 >>> ExtendedContext.remainder_near(Decimal('3.6'), Decimal('1.3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4758 Decimal('-0.3') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4759 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4760 return a.remainder_near(b, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4761 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4762 def rotate(self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4763 """Returns a rotated copy of a, b times. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4764 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4765 The coefficient of the result is a rotated copy of the digits in |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4766 the coefficient of the first operand. The number of places of |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4767 rotation is taken from the absolute value of the second operand, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4768 with the rotation being to the left if the second operand is |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4769 positive or to the right otherwise. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4770 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4771 >>> ExtendedContext.rotate(Decimal('34'), Decimal('8')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4772 Decimal('400000003') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4773 >>> ExtendedContext.rotate(Decimal('12'), Decimal('9')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4774 Decimal('12') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4775 >>> ExtendedContext.rotate(Decimal('123456789'), Decimal('-2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4776 Decimal('891234567') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4777 >>> ExtendedContext.rotate(Decimal('123456789'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4778 Decimal('123456789') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4779 >>> ExtendedContext.rotate(Decimal('123456789'), Decimal('+2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4780 Decimal('345678912') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4781 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4782 return a.rotate(b, context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4783 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4784 def same_quantum(self, a, b): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4785 """Returns True if the two operands have the same exponent. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4786 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4787 The result is never affected by either the sign or the coefficient of |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4788 either operand. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4789 |
| 32482 | 4790 >>> ExtendedContext.same_quantum(Decimal('2.17'), Decimal('0.001')) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4791 False |
| 32482 | 4792 >>> ExtendedContext.same_quantum(Decimal('2.17'), Decimal('0.01')) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4793 True |
| 32482 | 4794 >>> ExtendedContext.same_quantum(Decimal('2.17'), Decimal('1')) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4795 False |
| 32482 | 4796 >>> ExtendedContext.same_quantum(Decimal('Inf'), Decimal('-Inf')) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4797 True |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4798 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4799 return a.same_quantum(b) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4800 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4801 def scaleb (self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4802 """Returns the first operand after adding the second value its exp. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4803 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4804 >>> ExtendedContext.scaleb(Decimal('7.50'), Decimal('-2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4805 Decimal('0.0750') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4806 >>> ExtendedContext.scaleb(Decimal('7.50'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4807 Decimal('7.50') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4808 >>> ExtendedContext.scaleb(Decimal('7.50'), Decimal('3')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4809 Decimal('7.50E+3') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4810 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4811 return a.scaleb (b, context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4812 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4813 def shift(self, a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4814 """Returns a shifted copy of a, b times. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4815 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4816 The coefficient of the result is a shifted copy of the digits |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4817 in the coefficient of the first operand. The number of places |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4818 to shift is taken from the absolute value of the second operand, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4819 with the shift being to the left if the second operand is |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4820 positive or to the right otherwise. Digits shifted into the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4821 coefficient are zeros. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4822 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4823 >>> ExtendedContext.shift(Decimal('34'), Decimal('8')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4824 Decimal('400000000') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4825 >>> ExtendedContext.shift(Decimal('12'), Decimal('9')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4826 Decimal('0') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4827 >>> ExtendedContext.shift(Decimal('123456789'), Decimal('-2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4828 Decimal('1234567') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4829 >>> ExtendedContext.shift(Decimal('123456789'), Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4830 Decimal('123456789') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4831 >>> ExtendedContext.shift(Decimal('123456789'), Decimal('+2')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4832 Decimal('345678900') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4833 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4834 return a.shift(b, context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4835 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4836 def sqrt(self, a): |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4837 """Square root of a non-negative number to context precision. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4838 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4839 If the result must be inexact, it is rounded using the round-half-even |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4840 algorithm. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4841 |
| 32482 | 4842 >>> ExtendedContext.sqrt(Decimal('0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4843 Decimal('0') |
| 32482 | 4844 >>> ExtendedContext.sqrt(Decimal('-0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4845 Decimal('-0') |
| 32482 | 4846 >>> ExtendedContext.sqrt(Decimal('0.39')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4847 Decimal('0.624499800') |
| 32482 | 4848 >>> ExtendedContext.sqrt(Decimal('100')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4849 Decimal('10') |
| 32482 | 4850 >>> ExtendedContext.sqrt(Decimal('1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4851 Decimal('1') |
| 32482 | 4852 >>> ExtendedContext.sqrt(Decimal('1.0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4853 Decimal('1.0') |
| 32482 | 4854 >>> ExtendedContext.sqrt(Decimal('1.00')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4855 Decimal('1.0') |
| 32482 | 4856 >>> ExtendedContext.sqrt(Decimal('7')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4857 Decimal('2.64575131') |
| 32482 | 4858 >>> ExtendedContext.sqrt(Decimal('10')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4859 Decimal('3.16227766') |
| 32482 | 4860 >>> ExtendedContext.prec |
|
32481
b835d5c61d86
* Make the tests independent of the default precision.
Raymond Hettinger <python@rcn.com>
parents:
32477
diff
changeset
|
4861 9 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4862 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4863 return a.sqrt(context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4864 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4865 def subtract(self, a, b): |
|
35379
43211be0de41
bug [ 1266296 ] Mistakes in decimal.Context.subtract documentation
Georg Brandl <georg@python.org>
parents:
35113
diff
changeset
|
4866 """Return the difference between the two operands. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4867 |
| 32482 | 4868 >>> ExtendedContext.subtract(Decimal('1.3'), Decimal('1.07')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4869 Decimal('0.23') |
| 32482 | 4870 >>> ExtendedContext.subtract(Decimal('1.3'), Decimal('1.30')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4871 Decimal('0.00') |
| 32482 | 4872 >>> ExtendedContext.subtract(Decimal('1.3'), Decimal('2.07')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4873 Decimal('-0.77') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4874 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4875 return a.__sub__(b, context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4876 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4877 def to_eng_string(self, a): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4878 """Converts a number to a string, using scientific notation. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4879 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4880 The operation is not affected by the context. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4881 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4882 return a.to_eng_string(context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4883 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4884 def to_sci_string(self, a): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4885 """Converts a number to a string, using scientific notation. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4886 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4887 The operation is not affected by the context. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4888 """ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4889 return a.__str__(context=self) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4890 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4891 def to_integral_exact(self, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4892 """Rounds to an integer. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4893 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4894 When the operand has a negative exponent, the result is the same |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4895 as using the quantize() operation using the given operand as the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4896 left-hand-operand, 1E+0 as the right-hand-operand, and the precision |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4897 of the operand as the precision setting; Inexact and Rounded flags |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4898 are allowed in this operation. The rounding mode is taken from the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4899 context. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4900 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4901 >>> ExtendedContext.to_integral_exact(Decimal('2.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4902 Decimal('2') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4903 >>> ExtendedContext.to_integral_exact(Decimal('100')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4904 Decimal('100') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4905 >>> ExtendedContext.to_integral_exact(Decimal('100.0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4906 Decimal('100') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4907 >>> ExtendedContext.to_integral_exact(Decimal('101.5')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4908 Decimal('102') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4909 >>> ExtendedContext.to_integral_exact(Decimal('-101.5')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4910 Decimal('-102') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4911 >>> ExtendedContext.to_integral_exact(Decimal('10E+5')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4912 Decimal('1.0E+6') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4913 >>> ExtendedContext.to_integral_exact(Decimal('7.89E+77')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4914 Decimal('7.89E+77') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4915 >>> ExtendedContext.to_integral_exact(Decimal('-Inf')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4916 Decimal('-Infinity') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4917 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4918 return a.to_integral_exact(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4919 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4920 def to_integral_value(self, a): |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4921 """Rounds to an integer. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4922 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4923 When the operand has a negative exponent, the result is the same |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4924 as using the quantize() operation using the given operand as the |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4925 left-hand-operand, 1E+0 as the right-hand-operand, and the precision |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4926 of the operand as the precision setting, except that no flags will |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
4927 be set. The rounding mode is taken from the context. |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4928 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4929 >>> ExtendedContext.to_integral_value(Decimal('2.1')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4930 Decimal('2') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4931 >>> ExtendedContext.to_integral_value(Decimal('100')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4932 Decimal('100') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4933 >>> ExtendedContext.to_integral_value(Decimal('100.0')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4934 Decimal('100') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4935 >>> ExtendedContext.to_integral_value(Decimal('101.5')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4936 Decimal('102') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4937 >>> ExtendedContext.to_integral_value(Decimal('-101.5')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4938 Decimal('-102') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4939 >>> ExtendedContext.to_integral_value(Decimal('10E+5')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4940 Decimal('1.0E+6') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4941 >>> ExtendedContext.to_integral_value(Decimal('7.89E+77')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4942 Decimal('7.89E+77') |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4943 >>> ExtendedContext.to_integral_value(Decimal('-Inf')) |
|
45321
33122ff83405
Fix decimal repr which should have used single quotes like other reprs.
Raymond Hettinger <python@rcn.com>
parents:
45293
diff
changeset
|
4944 Decimal('-Infinity') |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4945 """ |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4946 return a.to_integral_value(context=self) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4947 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4948 # the method name changed, but we provide also the old one, for compatibility |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4949 to_integral = to_integral_value |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4950 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4951 class _WorkRep(object): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4952 __slots__ = ('sign','int','exp') |
| 33851 | 4953 # sign: 0 or 1 |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
4954 # int: int or long |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4955 # exp: None, int, or string |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4956 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4957 def __init__(self, value=None): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4958 if value is None: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4959 self.sign = None |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
4960 self.int = 0 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4961 self.exp = None |
| 33851 | 4962 elif isinstance(value, Decimal): |
| 4963 self.sign = value._sign | |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
4964 self.int = int(value._int) |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4965 self.exp = value._exp |
| 33851 | 4966 else: |
| 4967 # assert isinstance(value, tuple) | |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4968 self.sign = value[0] |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4969 self.int = value[1] |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4970 self.exp = value[2] |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4971 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4972 def __repr__(self): |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4973 return "(%r, %r, %r)" % (self.sign, self.int, self.exp) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4974 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4975 __str__ = __repr__ |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4976 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4977 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4978 |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
4979 def _normalize(op1, op2, prec = 0): |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4980 """Normalizes op1, op2 to have the same exp and length of coefficient. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4981 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4982 Done during addition. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4983 """ |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4984 if op1.exp < op2.exp: |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4985 tmp = op2 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4986 other = op1 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4987 else: |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4988 tmp = op1 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4989 other = op2 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
4990 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4991 # Let exp = min(tmp.exp - 1, tmp.adjusted() - precision - 1). |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4992 # Then adding 10**exp to tmp has the same effect (after rounding) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4993 # as adding any positive quantity smaller than 10**exp; similarly |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4994 # for subtraction. So if other is smaller than 10**exp we replace |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
4995 # it with 10**exp. This avoids tmp.exp - other.exp getting too large. |
|
44328
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
4996 tmp_len = len(str(tmp.int)) |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
4997 other_len = len(str(other.int)) |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
4998 exp = tmp.exp + min(-1, tmp_len - prec - 2) |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
4999 if other_len + other.exp - 1 < exp: |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
5000 other.int = 1 |
|
09f74316d5fb
Removed the private _rounding_decision: it was not needed, and the code
Facundo Batista <facundobatista@gmail.com>
parents:
44148
diff
changeset
|
5001 other.exp = exp |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5002 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5003 tmp.int *= 10 ** (tmp.exp - other.exp) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5004 tmp.exp = other.exp |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5005 return op1, op2 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5006 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5007 ##### Integer arithmetic functions used by ln, log10, exp and __pow__ ##### |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5008 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5009 # This function from Tim Peters was taken from here: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5010 # http://mail.python.org/pipermail/python-list/1999-July/007758.html |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5011 # The correction being in the function definition is for speed, and |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5012 # the whole function is not resolved with math.log because of avoiding |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5013 # the use of floats. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5014 def _nbits(n, correction = { |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5015 '0': 4, '1': 3, '2': 2, '3': 2, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5016 '4': 1, '5': 1, '6': 1, '7': 1, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5017 '8': 0, '9': 0, 'a': 0, 'b': 0, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5018 'c': 0, 'd': 0, 'e': 0, 'f': 0}): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5019 """Number of bits in binary representation of the positive integer n, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5020 or 0 if n == 0. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5021 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5022 if n < 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5023 raise ValueError("The argument to _nbits should be nonnegative.") |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5024 hex_n = "%x" % n |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5025 return 4*len(hex_n) - correction[hex_n[0]] |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5026 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5027 def _sqrt_nearest(n, a): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5028 """Closest integer to the square root of the positive integer n. a is |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5029 an initial approximation to the square root. Any positive integer |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5030 will do for a, but the closer a is to the square root of n the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5031 faster convergence will be. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5032 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5033 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5034 if n <= 0 or a <= 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5035 raise ValueError("Both arguments to _sqrt_nearest should be positive.") |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5036 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5037 b=0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5038 while a != b: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5039 b, a = a, a--n//a>>1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5040 return a |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5041 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5042 def _rshift_nearest(x, shift): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5043 """Given an integer x and a nonnegative integer shift, return closest |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5044 integer to x / 2**shift; use round-to-even in case of a tie. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5045 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5046 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5047 b, q = 1L << shift, x >> shift |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5048 return q + (2*(x & (b-1)) + (q&1) > b) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5049 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5050 def _div_nearest(a, b): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5051 """Closest integer to a/b, a and b positive integers; rounds to even |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5052 in the case of a tie. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5053 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5054 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5055 q, r = divmod(a, b) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5056 return q + (2*r + (q&1) > b) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5057 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5058 def _ilog(x, M, L = 8): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5059 """Integer approximation to M*log(x/M), with absolute error boundable |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5060 in terms only of x/M. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5061 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5062 Given positive integers x and M, return an integer approximation to |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5063 M * log(x/M). For L = 8 and 0.1 <= x/M <= 10 the difference |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5064 between the approximation and the exact result is at most 22. For |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5065 L = 8 and 1.0 <= x/M <= 10.0 the difference is at most 15. In |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5066 both cases these are upper bounds on the error; it will usually be |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5067 much smaller.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5068 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5069 # The basic algorithm is the following: let log1p be the function |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5070 # log1p(x) = log(1+x). Then log(x/M) = log1p((x-M)/M). We use |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5071 # the reduction |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5072 # |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5073 # log1p(y) = 2*log1p(y/(1+sqrt(1+y))) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5074 # |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5075 # repeatedly until the argument to log1p is small (< 2**-L in |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5076 # absolute value). For small y we can use the Taylor series |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5077 # expansion |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5078 # |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5079 # log1p(y) ~ y - y**2/2 + y**3/3 - ... - (-y)**T/T |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5080 # |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5081 # truncating at T such that y**T is small enough. The whole |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5082 # computation is carried out in a form of fixed-point arithmetic, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5083 # with a real number z being represented by an integer |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5084 # approximation to z*M. To avoid loss of precision, the y below |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5085 # is actually an integer approximation to 2**R*y*M, where R is the |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5086 # number of reductions performed so far. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5087 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5088 y = x-M |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5089 # argument reduction; R = number of reductions performed |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5090 R = 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5091 while (R <= L and long(abs(y)) << L-R >= M or |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5092 R > L and abs(y) >> R-L >= M): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5093 y = _div_nearest(long(M*y) << 1, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5094 M + _sqrt_nearest(M*(M+_rshift_nearest(y, R)), M)) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5095 R += 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5096 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5097 # Taylor series with T terms |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5098 T = -int(-10*len(str(M))//(3*L)) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5099 yshift = _rshift_nearest(y, R) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5100 w = _div_nearest(M, T) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5101 for k in xrange(T-1, 0, -1): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5102 w = _div_nearest(M, k) - _div_nearest(yshift*w, M) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5103 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5104 return _div_nearest(w*y, M) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5105 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5106 def _dlog10(c, e, p): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5107 """Given integers c, e and p with c > 0, p >= 0, compute an integer |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5108 approximation to 10**p * log10(c*10**e), with an absolute error of |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5109 at most 1. Assumes that c*10**e is not exactly 1.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5110 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5111 # increase precision by 2; compensate for this by dividing |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5112 # final result by 100 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5113 p += 2 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5114 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5115 # write c*10**e as d*10**f with either: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5116 # f >= 0 and 1 <= d <= 10, or |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5117 # f <= 0 and 0.1 <= d <= 1. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5118 # Thus for c*10**e close to 1, f = 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5119 l = len(str(c)) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5120 f = e+l - (e+l >= 1) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5121 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5122 if p > 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5123 M = 10**p |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5124 k = e+p-f |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5125 if k >= 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5126 c *= 10**k |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5127 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5128 c = _div_nearest(c, 10**-k) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5129 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5130 log_d = _ilog(c, M) # error < 5 + 22 = 27 |
|
43455
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5131 log_10 = _log10_digits(p) # error < 1 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5132 log_d = _div_nearest(log_d*M, log_10) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5133 log_tenpower = f*M # exact |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5134 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5135 log_d = 0 # error < 2.31 |
| 48847 | 5136 log_tenpower = _div_nearest(f, 10**-p) # error < 0.5 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5137 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5138 return _div_nearest(log_tenpower+log_d, 100) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5139 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5140 def _dlog(c, e, p): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5141 """Given integers c, e and p with c > 0, compute an integer |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5142 approximation to 10**p * log(c*10**e), with an absolute error of |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5143 at most 1. Assumes that c*10**e is not exactly 1.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5144 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5145 # Increase precision by 2. The precision increase is compensated |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5146 # for at the end with a division by 100. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5147 p += 2 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5148 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5149 # rewrite c*10**e as d*10**f with either f >= 0 and 1 <= d <= 10, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5150 # or f <= 0 and 0.1 <= d <= 1. Then we can compute 10**p * log(c*10**e) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
5151 # as 10**p * log(d) + 10**p*f * log(10). |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5152 l = len(str(c)) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5153 f = e+l - (e+l >= 1) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5154 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5155 # compute approximation to 10**p*log(d), with error < 27 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5156 if p > 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5157 k = e+p-f |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5158 if k >= 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5159 c *= 10**k |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5160 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5161 c = _div_nearest(c, 10**-k) # error of <= 0.5 in c |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5162 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5163 # _ilog magnifies existing error in c by a factor of at most 10 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5164 log_d = _ilog(c, 10**p) # error < 5 + 22 = 27 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5165 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5166 # p <= 0: just approximate the whole thing by 0; error < 2.31 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5167 log_d = 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5168 |
|
43455
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5169 # compute approximation to f*10**p*log(10), with error < 11. |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5170 if f: |
|
43455
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5171 extra = len(str(abs(f)))-1 |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5172 if p + extra >= 0: |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5173 # error in f * _log10_digits(p+extra) < |f| * 1 = |f| |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5174 # after division, error < |f|/10**extra + 0.5 < 10 + 0.5 < 11 |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5175 f_log_ten = _div_nearest(f*_log10_digits(p+extra), 10**extra) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5176 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5177 f_log_ten = 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5178 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5179 f_log_ten = 0 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5180 |
|
43455
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5181 # error in sum < 11+27 = 38; error after division < 0.38 + 0.5 < 1 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5182 return _div_nearest(f_log_ten + log_d, 100) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5183 |
|
43455
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5184 class _Log10Memoize(object): |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5185 """Class to compute, store, and allow retrieval of, digits of the |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
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diff
changeset
|
5186 constant log(10) = 2.302585.... This constant is needed by |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
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diff
changeset
|
5187 Decimal.ln, Decimal.log10, Decimal.exp and Decimal.__pow__.""" |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5188 def __init__(self): |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
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diff
changeset
|
5189 self.digits = "23025850929940456840179914546843642076011014886" |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5190 |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5191 def getdigits(self, p): |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5192 """Given an integer p >= 0, return floor(10**p)*log(10). |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5193 |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5194 For example, self.getdigits(3) returns 2302. |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
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diff
changeset
|
5195 """ |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5196 # digits are stored as a string, for quick conversion to |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5197 # integer in the case that we've already computed enough |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5198 # digits; the stored digits should always be correct |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5199 # (truncated, not rounded to nearest). |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5200 if p < 0: |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5201 raise ValueError("p should be nonnegative") |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5202 |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5203 if p >= len(self.digits): |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5204 # compute p+3, p+6, p+9, ... digits; continue until at |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5205 # least one of the extra digits is nonzero |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5206 extra = 3 |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5207 while True: |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5208 # compute p+extra digits, correct to within 1ulp |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5209 M = 10**(p+extra+2) |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5210 digits = str(_div_nearest(_ilog(10*M, M), 100)) |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5211 if digits[-extra:] != '0'*extra: |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5212 break |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5213 extra += 3 |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5214 # keep all reliable digits so far; remove trailing zeros |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5215 # and next nonzero digit |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5216 self.digits = digits.rstrip('0')[:-1] |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5217 return int(self.digits[:p+1]) |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5218 |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5219 _log10_digits = _Log10Memoize().getdigits |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5220 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5221 def _iexp(x, M, L=8): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5222 """Given integers x and M, M > 0, such that x/M is small in absolute |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5223 value, compute an integer approximation to M*exp(x/M). For 0 <= |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5224 x/M <= 2.4, the absolute error in the result is bounded by 60 (and |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5225 is usually much smaller).""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5226 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5227 # Algorithm: to compute exp(z) for a real number z, first divide z |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5228 # by a suitable power R of 2 so that |z/2**R| < 2**-L. Then |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5229 # compute expm1(z/2**R) = exp(z/2**R) - 1 using the usual Taylor |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5230 # series |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5231 # |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
5232 # expm1(x) = x + x**2/2! + x**3/3! + ... |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5233 # |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5234 # Now use the identity |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5235 # |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5236 # expm1(2x) = expm1(x)*(expm1(x)+2) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5237 # |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5238 # R times to compute the sequence expm1(z/2**R), |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5239 # expm1(z/2**(R-1)), ... , exp(z/2), exp(z). |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
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diff
changeset
|
5240 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5241 # Find R such that x/2**R/M <= 2**-L |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
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diff
changeset
|
5242 R = _nbits((long(x)<<L)//M) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5243 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5244 # Taylor series. (2**L)**T > M |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
5245 T = -int(-10*len(str(M))//(3*L)) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5246 y = _div_nearest(x, T) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
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diff
changeset
|
5247 Mshift = long(M)<<R |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
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diff
changeset
|
5248 for i in xrange(T-1, 0, -1): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5249 y = _div_nearest(x*(Mshift + y), Mshift * i) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
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diff
changeset
|
5250 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
5251 # Expansion |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
5252 for k in xrange(R-1, -1, -1): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5253 Mshift = long(M)<<(k+2) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
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parents:
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diff
changeset
|
5254 y = _div_nearest(y*(y+Mshift), Mshift) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
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diff
changeset
|
5255 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5256 return M+y |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
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diff
changeset
|
5257 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5258 def _dexp(c, e, p): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5259 """Compute an approximation to exp(c*10**e), with p decimal places of |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5260 precision. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5261 |
|
43455
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5262 Returns integers d, f such that: |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5263 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5264 10**(p-1) <= d <= 10**p, and |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5265 (d-1)*10**f < exp(c*10**e) < (d+1)*10**f |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5266 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5267 In other words, d*10**f is an approximation to exp(c*10**e) with p |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5268 digits of precision, and with an error in d of at most 1. This is |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5269 almost, but not quite, the same as the error being < 1ulp: when d |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5270 = 10**(p-1) the error could be up to 10 ulp.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5271 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5272 # we'll call iexp with M = 10**(p+2), giving p+3 digits of precision |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5273 p += 2 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5274 |
|
43455
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5275 # compute log(10) with extra precision = adjusted exponent of c*10**e |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5276 extra = max(0, e + len(str(c)) - 1) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5277 q = p + extra |
|
43455
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5278 |
|
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5279 # compute quotient c*10**e/(log(10)) = c*10**(e+q)/(log(10)*10**q), |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5280 # rounding down |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5281 shift = e+q |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5282 if shift >= 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5283 cshift = c*10**shift |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5284 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5285 cshift = c//10**-shift |
|
43455
7943262e5fc4
Added a class to store the digits of log(10), so that they can be made
Facundo Batista <facundobatista@gmail.com>
parents:
43454
diff
changeset
|
5286 quot, rem = divmod(cshift, _log10_digits(q)) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5287 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5288 # reduce remainder back to original precision |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5289 rem = _div_nearest(rem, 10**extra) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5290 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5291 # error in result of _iexp < 120; error after division < 0.62 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5292 return _div_nearest(_iexp(rem, 10**p), 1000), quot - p + 3 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5293 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5294 def _dpower(xc, xe, yc, ye, p): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5295 """Given integers xc, xe, yc and ye representing Decimals x = xc*10**xe and |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5296 y = yc*10**ye, compute x**y. Returns a pair of integers (c, e) such that: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5297 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5298 10**(p-1) <= c <= 10**p, and |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5299 (c-1)*10**e < x**y < (c+1)*10**e |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5300 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5301 in other words, c*10**e is an approximation to x**y with p digits |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5302 of precision, and with an error in c of at most 1. (This is |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5303 almost, but not quite, the same as the error being < 1ulp: when c |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5304 == 10**(p-1) we can only guarantee error < 10ulp.) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5305 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5306 We assume that: x is positive and not equal to 1, and y is nonzero. |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5307 """ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5308 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5309 # Find b such that 10**(b-1) <= |y| <= 10**b |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5310 b = len(str(abs(yc))) + ye |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5311 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5312 # log(x) = lxc*10**(-p-b-1), to p+b+1 places after the decimal point |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5313 lxc = _dlog(xc, xe, p+b+1) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5314 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5315 # compute product y*log(x) = yc*lxc*10**(-p-b-1+ye) = pc*10**(-p-1) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5316 shift = ye-b |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5317 if shift >= 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5318 pc = lxc*yc*10**shift |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5319 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5320 pc = _div_nearest(lxc*yc, 10**-shift) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5321 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5322 if pc == 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5323 # we prefer a result that isn't exactly 1; this makes it |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5324 # easier to compute a correctly rounded result in __pow__ |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5325 if ((len(str(xc)) + xe >= 1) == (yc > 0)): # if x**y > 1: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5326 coeff, exp = 10**(p-1)+1, 1-p |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5327 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5328 coeff, exp = 10**p-1, -p |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5329 else: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5330 coeff, exp = _dexp(pc, -(p+1), p+1) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5331 coeff = _div_nearest(coeff, 10) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5332 exp += 1 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5333 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5334 return coeff, exp |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5335 |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5336 def _log10_lb(c, correction = { |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5337 '1': 100, '2': 70, '3': 53, '4': 40, '5': 31, |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5338 '6': 23, '7': 16, '8': 10, '9': 5}): |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5339 """Compute a lower bound for 100*log10(c) for a positive integer c.""" |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5340 if c <= 0: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5341 raise ValueError("The argument to _log10_lb should be nonnegative.") |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5342 str_c = str(c) |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5343 return 100*len(str_c) - correction[str_c[0]] |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5344 |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
5345 ##### Helper Functions #################################################### |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5346 |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5347 def _convert_other(other, raiseit=False): |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
5348 """Convert other to Decimal. |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
5349 |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
5350 Verifies that it's ok to use in an implicit construction. |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
5351 """ |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
5352 if isinstance(other, Decimal): |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
5353 return other |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
5354 if isinstance(other, (int, long)): |
|
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
5355 return Decimal(other) |
|
43360
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5356 if raiseit: |
|
63f3154c731d
Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
Facundo Batista <facundobatista@gmail.com>
parents:
42605
diff
changeset
|
5357 raise TypeError("Unable to convert %s to Decimal" % other) |
|
34812
b016236dfbd9
* Fix decimal's handling of foreign types. Now returns NotImplemented
Raymond Hettinger <python@rcn.com>
parents:
34758
diff
changeset
|
5358 return NotImplemented |
|
33519
139a4012bead
SF patch #1020845: Decimal performance enhancements
Raymond Hettinger <python@rcn.com>
parents:
33198
diff
changeset
|
5359 |
|
41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
5360 ##### Setup Specific Contexts ############################################ |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5361 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5362 # The default context prototype used by Context() |
|
32666
c13d911ae05b
* Rename "Signals" to "_signals" making it non-public.
Raymond Hettinger <python@rcn.com>
parents:
32576
diff
changeset
|
5363 # Is mutable, so that new contexts can have different default values |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5364 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5365 DefaultContext = Context( |
|
32481
b835d5c61d86
* Make the tests independent of the default precision.
Raymond Hettinger <python@rcn.com>
parents:
32477
diff
changeset
|
5366 prec=28, rounding=ROUND_HALF_EVEN, |
|
32576
83cbc025bfc7
Improve Context construction and representation:
Raymond Hettinger <python@rcn.com>
parents:
32561
diff
changeset
|
5367 traps=[DivisionByZero, Overflow, InvalidOperation], |
|
83cbc025bfc7
Improve Context construction and representation:
Raymond Hettinger <python@rcn.com>
parents:
32561
diff
changeset
|
5368 flags=[], |
|
32674
3479610fb288
Factor out two unnecessary global variables.
Raymond Hettinger <python@rcn.com>
parents:
32667
diff
changeset
|
5369 Emax=999999999, |
|
3479610fb288
Factor out two unnecessary global variables.
Raymond Hettinger <python@rcn.com>
parents:
32667
diff
changeset
|
5370 Emin=-999999999, |
| 32496 | 5371 capitals=1 |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5372 ) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5373 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5374 # Pre-made alternate contexts offered by the specification |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5375 # Don't change these; the user should be able to select these |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5376 # contexts and be able to reproduce results from other implementations |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5377 # of the spec. |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5378 |
| 32482 | 5379 BasicContext = Context( |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5380 prec=9, rounding=ROUND_HALF_UP, |
|
32576
83cbc025bfc7
Improve Context construction and representation:
Raymond Hettinger <python@rcn.com>
parents:
32561
diff
changeset
|
5381 traps=[DivisionByZero, Overflow, InvalidOperation, Clamped, Underflow], |
|
83cbc025bfc7
Improve Context construction and representation:
Raymond Hettinger <python@rcn.com>
parents:
32561
diff
changeset
|
5382 flags=[], |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5383 ) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5384 |
| 32482 | 5385 ExtendedContext = Context( |
|
32481
b835d5c61d86
* Make the tests independent of the default precision.
Raymond Hettinger <python@rcn.com>
parents:
32477
diff
changeset
|
5386 prec=9, rounding=ROUND_HALF_EVEN, |
|
32576
83cbc025bfc7
Improve Context construction and representation:
Raymond Hettinger <python@rcn.com>
parents:
32561
diff
changeset
|
5387 traps=[], |
|
83cbc025bfc7
Improve Context construction and representation:
Raymond Hettinger <python@rcn.com>
parents:
32561
diff
changeset
|
5388 flags=[], |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5389 ) |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5390 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5391 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5392 ##### crud for parsing strings ############################################# |
|
45505
bf8ee593cbad
Remove duplicate 'import re' in decimal.py
Mark Dickinson <dickinsm@gmail.com>
parents:
45321
diff
changeset
|
5393 # |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5394 # Regular expression used for parsing numeric strings. Additional |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5395 # comments: |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5396 # |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5397 # 1. Uncomment the two '\s*' lines to allow leading and/or trailing |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5398 # whitespace. But note that the specification disallows whitespace in |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5399 # a numeric string. |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5400 # |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5401 # 2. For finite numbers (not infinities and NaNs) the body of the |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5402 # number between the optional sign and the optional exponent must have |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5403 # at least one decimal digit, possibly after the decimal point. The |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5404 # lookahead expression '(?=\d|\.\d)' checks this. |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5405 # |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5406 # As the flag UNICODE is not enabled here, we're explicitly avoiding any |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5407 # other meaning for \d than the numbers [0-9]. |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5408 |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5409 import re |
|
47872
65af544da121
Replace occurrences of '\d' with '[0-9]' in Decimal regex, to make sure
Mark Dickinson <dickinsm@gmail.com>
parents:
46653
diff
changeset
|
5410 _parser = re.compile(r""" # A numeric string consists of: |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5411 # \s* |
|
47872
65af544da121
Replace occurrences of '\d' with '[0-9]' in Decimal regex, to make sure
Mark Dickinson <dickinsm@gmail.com>
parents:
46653
diff
changeset
|
5412 (?P<sign>[-+])? # an optional sign, followed by either... |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5413 ( |
|
47872
65af544da121
Replace occurrences of '\d' with '[0-9]' in Decimal regex, to make sure
Mark Dickinson <dickinsm@gmail.com>
parents:
46653
diff
changeset
|
5414 (?=[0-9]|\.[0-9]) # ...a number (with at least one digit) |
|
65af544da121
Replace occurrences of '\d' with '[0-9]' in Decimal regex, to make sure
Mark Dickinson <dickinsm@gmail.com>
parents:
46653
diff
changeset
|
5415 (?P<int>[0-9]*) # having a (possibly empty) integer part |
|
65af544da121
Replace occurrences of '\d' with '[0-9]' in Decimal regex, to make sure
Mark Dickinson <dickinsm@gmail.com>
parents:
46653
diff
changeset
|
5416 (\.(?P<frac>[0-9]*))? # followed by an optional fractional part |
|
65af544da121
Replace occurrences of '\d' with '[0-9]' in Decimal regex, to make sure
Mark Dickinson <dickinsm@gmail.com>
parents:
46653
diff
changeset
|
5417 (E(?P<exp>[-+]?[0-9]+))? # followed by an optional exponent, or... |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5418 | |
|
47872
65af544da121
Replace occurrences of '\d' with '[0-9]' in Decimal regex, to make sure
Mark Dickinson <dickinsm@gmail.com>
parents:
46653
diff
changeset
|
5419 Inf(inity)? # ...an infinity, or... |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5420 | |
|
47872
65af544da121
Replace occurrences of '\d' with '[0-9]' in Decimal regex, to make sure
Mark Dickinson <dickinsm@gmail.com>
parents:
46653
diff
changeset
|
5421 (?P<signal>s)? # ...an (optionally signaling) |
|
65af544da121
Replace occurrences of '\d' with '[0-9]' in Decimal regex, to make sure
Mark Dickinson <dickinsm@gmail.com>
parents:
46653
diff
changeset
|
5422 NaN # NaN |
|
65af544da121
Replace occurrences of '\d' with '[0-9]' in Decimal regex, to make sure
Mark Dickinson <dickinsm@gmail.com>
parents:
46653
diff
changeset
|
5423 (?P<diag>[0-9]*) # with (possibly empty) diagnostic info. |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5424 ) |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5425 # \s* |
|
44650
7b798548a4ad
Issue 1780: Allow leading and trailing whitespace in Decimal constructor,
Mark Dickinson <dickinsm@gmail.com>
parents:
44631
diff
changeset
|
5426 \Z |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5427 """, re.VERBOSE | re.IGNORECASE).match |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5428 |
|
44121
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
5429 _all_zeros = re.compile('0*$').match |
|
30f54977828b
Faster _fix function, and some reordering for a more elegant
Facundo Batista <facundobatista@gmail.com>
parents:
44120
diff
changeset
|
5430 _exact_half = re.compile('50*$').match |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5431 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5432 ##### PEP3101 support functions ############################################## |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5433 # The functions in this section have little to do with the Decimal |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5434 # class, and could potentially be reused or adapted for other pure |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5435 # Python numeric classes that want to implement __format__ |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5436 # |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5437 # A format specifier for Decimal looks like: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5438 # |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5439 # [[fill]align][sign][0][minimumwidth][,][.precision][type] |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5440 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5441 _parse_format_specifier_regex = re.compile(r"""\A |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5442 (?: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5443 (?P<fill>.)? |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5444 (?P<align>[<>=^]) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5445 )? |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5446 (?P<sign>[-+ ])? |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5447 (?P<zeropad>0)? |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5448 (?P<minimumwidth>(?!0)\d+)? |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5449 (?P<thousands_sep>,)? |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5450 (?:\.(?P<precision>0|(?!0)\d+))? |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5451 (?P<type>[eEfFgGn%])? |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5452 \Z |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5453 """, re.VERBOSE) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5454 |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5455 del re |
|
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5456 |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5457 # The locale module is only needed for the 'n' format specifier. The |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5458 # rest of the PEP 3101 code functions quite happily without it, so we |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5459 # don't care too much if locale isn't present. |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5460 try: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5461 import locale as _locale |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5462 except ImportError: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5463 pass |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5464 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5465 def _parse_format_specifier(format_spec, _localeconv=None): |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5466 """Parse and validate a format specifier. |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5467 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5468 Turns a standard numeric format specifier into a dict, with the |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5469 following entries: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5470 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5471 fill: fill character to pad field to minimum width |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5472 align: alignment type, either '<', '>', '=' or '^' |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5473 sign: either '+', '-' or ' ' |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5474 minimumwidth: nonnegative integer giving minimum width |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5475 zeropad: boolean, indicating whether to pad with zeros |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5476 thousands_sep: string to use as thousands separator, or '' |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5477 grouping: grouping for thousands separators, in format |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5478 used by localeconv |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5479 decimal_point: string to use for decimal point |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5480 precision: nonnegative integer giving precision, or None |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5481 type: one of the characters 'eEfFgG%', or None |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5482 unicode: boolean (always True for Python 3.x) |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5483 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5484 """ |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5485 m = _parse_format_specifier_regex.match(format_spec) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5486 if m is None: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5487 raise ValueError("Invalid format specifier: " + format_spec) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5488 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5489 # get the dictionary |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5490 format_dict = m.groupdict() |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5491 |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5492 # zeropad; defaults for fill and alignment. If zero padding |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5493 # is requested, the fill and align fields should be absent. |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5494 fill = format_dict['fill'] |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5495 align = format_dict['align'] |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5496 format_dict['zeropad'] = (format_dict['zeropad'] is not None) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5497 if format_dict['zeropad']: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5498 if fill is not None: |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5499 raise ValueError("Fill character conflicts with '0'" |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5500 " in format specifier: " + format_spec) |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5501 if align is not None: |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5502 raise ValueError("Alignment conflicts with '0' in " |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5503 "format specifier: " + format_spec) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5504 format_dict['fill'] = fill or ' ' |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5505 format_dict['align'] = align or '<' |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5506 |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5507 # default sign handling: '-' for negative, '' for positive |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5508 if format_dict['sign'] is None: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5509 format_dict['sign'] = '-' |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5510 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5511 # minimumwidth defaults to 0; precision remains None if not given |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5512 format_dict['minimumwidth'] = int(format_dict['minimumwidth'] or '0') |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5513 if format_dict['precision'] is not None: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5514 format_dict['precision'] = int(format_dict['precision']) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5515 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5516 # if format type is 'g' or 'G' then a precision of 0 makes little |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5517 # sense; convert it to 1. Same if format type is unspecified. |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5518 if format_dict['precision'] == 0: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5519 if format_dict['type'] in 'gG' or format_dict['type'] is None: |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5520 format_dict['precision'] = 1 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5521 |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5522 # determine thousands separator, grouping, and decimal separator, and |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5523 # add appropriate entries to format_dict |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5524 if format_dict['type'] == 'n': |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5525 # apart from separators, 'n' behaves just like 'g' |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5526 format_dict['type'] = 'g' |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5527 if _localeconv is None: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5528 _localeconv = _locale.localeconv() |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5529 if format_dict['thousands_sep'] is not None: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5530 raise ValueError("Explicit thousands separator conflicts with " |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5531 "'n' type in format specifier: " + format_spec) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5532 format_dict['thousands_sep'] = _localeconv['thousands_sep'] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5533 format_dict['grouping'] = _localeconv['grouping'] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5534 format_dict['decimal_point'] = _localeconv['decimal_point'] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5535 else: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5536 if format_dict['thousands_sep'] is None: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5537 format_dict['thousands_sep'] = '' |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5538 format_dict['grouping'] = [3, 0] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5539 format_dict['decimal_point'] = '.' |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5540 |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5541 # record whether return type should be str or unicode |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5542 format_dict['unicode'] = isinstance(format_spec, unicode) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5543 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5544 return format_dict |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5545 |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5546 def _format_align(sign, body, spec): |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5547 """Given an unpadded, non-aligned numeric string 'body' and sign |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5548 string 'sign', add padding and aligment conforming to the given |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5549 format specifier dictionary 'spec' (as produced by |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5550 parse_format_specifier). |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5551 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5552 Also converts result to unicode if necessary. |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5553 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5554 """ |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5555 # how much extra space do we have to play with? |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5556 minimumwidth = spec['minimumwidth'] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5557 fill = spec['fill'] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5558 padding = fill*(minimumwidth - len(sign) - len(body)) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
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diff
changeset
|
5559 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5560 align = spec['align'] |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5561 if align == '<': |
|
52188
6b738b6f7fc6
Fix bug in Decimal __format__ method that swapped left and right
Mark Dickinson <dickinsm@gmail.com>
parents:
52114
diff
changeset
|
5562 result = sign + body + padding |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5563 elif align == '>': |
|
52188
6b738b6f7fc6
Fix bug in Decimal __format__ method that swapped left and right
Mark Dickinson <dickinsm@gmail.com>
parents:
52114
diff
changeset
|
5564 result = padding + sign + body |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5565 elif align == '=': |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5566 result = sign + padding + body |
|
52195
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Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5567 elif align == '^': |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5568 half = len(padding)//2 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5569 result = padding[:half] + sign + body + padding[half:] |
|
52195
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Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5570 else: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5571 raise ValueError('Unrecognised alignment field') |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5572 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5573 # make sure that result is unicode if necessary |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5574 if spec['unicode']: |
|
45566
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5575 result = unicode(result) |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5576 |
|
bce4c40df7df
Add __format__ method to Decimal, to support PEP 3101
Mark Dickinson <dickinsm@gmail.com>
parents:
45505
diff
changeset
|
5577 return result |
|
43993
a4a140486691
Major change in the internal structure of the Decimal
Facundo Batista <facundobatista@gmail.com>
parents:
43602
diff
changeset
|
5578 |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5579 def _group_lengths(grouping): |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5580 """Convert a localeconv-style grouping into a (possibly infinite) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5581 iterable of integers representing group lengths. |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5582 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5583 """ |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5584 # The result from localeconv()['grouping'], and the input to this |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5585 # function, should be a list of integers in one of the |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5586 # following three forms: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5587 # |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5588 # (1) an empty list, or |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5589 # (2) nonempty list of positive integers + [0] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5590 # (3) list of positive integers + [locale.CHAR_MAX], or |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5591 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5592 from itertools import chain, repeat |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5593 if not grouping: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5594 return [] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5595 elif grouping[-1] == 0 and len(grouping) >= 2: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5596 return chain(grouping[:-1], repeat(grouping[-2])) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5597 elif grouping[-1] == _locale.CHAR_MAX: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5598 return grouping[:-1] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5599 else: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5600 raise ValueError('unrecognised format for grouping') |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5601 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5602 def _insert_thousands_sep(digits, spec, min_width=1): |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5603 """Insert thousands separators into a digit string. |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5604 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5605 spec is a dictionary whose keys should include 'thousands_sep' and |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5606 'grouping'; typically it's the result of parsing the format |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5607 specifier using _parse_format_specifier. |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5608 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5609 The min_width keyword argument gives the minimum length of the |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5610 result, which will be padded on the left with zeros if necessary. |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5611 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5612 If necessary, the zero padding adds an extra '0' on the left to |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5613 avoid a leading thousands separator. For example, inserting |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5614 commas every three digits in '123456', with min_width=8, gives |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5615 '0,123,456', even though that has length 9. |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5616 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5617 """ |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5618 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5619 sep = spec['thousands_sep'] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5620 grouping = spec['grouping'] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5621 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5622 groups = [] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5623 for l in _group_lengths(grouping): |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5624 if l <= 0: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5625 raise ValueError("group length should be positive") |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5626 # max(..., 1) forces at least 1 digit to the left of a separator |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5627 l = min(max(len(digits), min_width, 1), l) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5628 groups.append('0'*(l - len(digits)) + digits[-l:]) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5629 digits = digits[:-l] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5630 min_width -= l |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5631 if not digits and min_width <= 0: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5632 break |
|
52200
2d94c8fed376
Fix bug in _insert_thousands_sep: too much zero padding could be
Mark Dickinson <dickinsm@gmail.com>
parents:
52195
diff
changeset
|
5633 min_width -= len(sep) |
|
52195
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5634 else: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5635 l = max(len(digits), min_width, 1) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5636 groups.append('0'*(l - len(digits)) + digits[-l:]) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5637 return sep.join(reversed(groups)) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5638 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5639 def _format_sign(is_negative, spec): |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5640 """Determine sign character.""" |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5641 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5642 if is_negative: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5643 return '-' |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5644 elif spec['sign'] in ' +': |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5645 return spec['sign'] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5646 else: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5647 return '' |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5648 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5649 def _format_number(is_negative, intpart, fracpart, exp, spec): |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5650 """Format a number, given the following data: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5651 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5652 is_negative: true if the number is negative, else false |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5653 intpart: string of digits that must appear before the decimal point |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5654 fracpart: string of digits that must come after the point |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5655 exp: exponent, as an integer |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5656 spec: dictionary resulting from parsing the format specifier |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5657 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5658 This function uses the information in spec to: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5659 insert separators (decimal separator and thousands separators) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5660 format the sign |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5661 format the exponent |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5662 add trailing '%' for the '%' type |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5663 zero-pad if necessary |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5664 fill and align if necessary |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5665 """ |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5666 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5667 sign = _format_sign(is_negative, spec) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5668 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5669 if fracpart: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5670 fracpart = spec['decimal_point'] + fracpart |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5671 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5672 if exp != 0 or spec['type'] in 'eE': |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5673 echar = {'E': 'E', 'e': 'e', 'G': 'E', 'g': 'e'}[spec['type']] |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5674 fracpart += "{0}{1:+}".format(echar, exp) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5675 if spec['type'] == '%': |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5676 fracpart += '%' |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5677 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5678 if spec['zeropad']: |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5679 min_width = spec['minimumwidth'] - len(fracpart) - len(sign) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
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5680 else: |
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5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5681 min_width = 0 |
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5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5682 intpart = _insert_thousands_sep(intpart, spec, min_width) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5683 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5684 return _format_align(sign, intpart+fracpart, spec) |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
|
5685 |
|
5dee93a97558
Issue #2110: Add support for thousands separator and 'n' format specifier
Mark Dickinson <dickinsm@gmail.com>
parents:
52188
diff
changeset
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5686 |
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41418
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
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changeset
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5687 ##### Useful Constants (internal use only) ################################ |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
diff
changeset
|
5688 |
|
ae4ced28a839
General clean-up. Lot of margin corrections, comments, some typos.
Facundo Batista <facundobatista@gmail.com>
parents:
40770
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changeset
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5689 # Reusable defaults |
| 50497 | 5690 _Infinity = Decimal('Inf') |
| 5691 _NegativeInfinity = Decimal('-Inf') | |
|
50471
94ff3de1e1a4
Merged revisions 68182 via svnmerge from
Mark Dickinson <dickinsm@gmail.com>
parents:
50116
diff
changeset
|
5692 _NaN = Decimal('NaN') |
| 50497 | 5693 _Zero = Decimal(0) |
| 5694 _One = Decimal(1) | |
| 5695 _NegativeOne = Decimal(-1) | |
| 5696 | |
| 5697 # _SignedInfinity[sign] is infinity w/ that sign | |
| 5698 _SignedInfinity = (_Infinity, _NegativeInfinity) | |
|
32451
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
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5699 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5700 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5701 |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
|
5702 if __name__ == '__main__': |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
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5703 import doctest, sys |
|
d2c1c7ae7cf4
Move Decimal from the sandbox into production.
Raymond Hettinger <python@rcn.com>
parents:
diff
changeset
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5704 doctest.testmod(sys.modules[__name__]) |