Mercurial > cpython-lru_cache-weakref

annotate Lib/fpformat.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 0c02e15a7c1f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """General floating point formatting functions.
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2
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3 Functions:
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4 fix(x, digits_behind)
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5 sci(x, digits_behind)
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6
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7 Each takes a number or a string and a number of digits as arguments.
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8
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9 Parameters:
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10 x: number to be formatted; or a string resembling a number
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11 digits_behind: number of digits behind the decimal point
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12 """
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13 from warnings import warnpy3k
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14 warnpy3k("the fpformat module has been removed in Python 3.0", stacklevel=2)
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15 del warnpy3k
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16
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17 import re
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18
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19 __all__ = ["fix","sci","NotANumber"]
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20
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21 # Compiled regular expression to "decode" a number
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22 decoder = re.compile(r'^([-+]?)0*(\d*)((?:\.\d*)?)(([eE][-+]?\d+)?)$')
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23 # \0 the whole thing
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24 # \1 leading sign or empty
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25 # \2 digits left of decimal point
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26 # \3 fraction (empty or begins with point)
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27 # \4 exponent part (empty or begins with 'e' or 'E')
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28
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29 try:
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30 class NotANumber(ValueError):
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31 pass
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32 except TypeError:
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33 NotANumber = 'fpformat.NotANumber'
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34
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35 def extract(s):
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36 """Return (sign, intpart, fraction, expo) or raise an exception:
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37 sign is '+' or '-'
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38 intpart is 0 or more digits beginning with a nonzero
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39 fraction is 0 or more digits
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40 expo is an integer"""
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41 res = decoder.match(s)
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42 if res is None: raise NotANumber, s
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43 sign, intpart, fraction, exppart = res.group(1,2,3,4)
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44 if sign == '+': sign = ''
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45 if fraction: fraction = fraction[1:]
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46 if exppart: expo = int(exppart[1:])
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47 else: expo = 0
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48 return sign, intpart, fraction, expo
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49
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50 def unexpo(intpart, fraction, expo):
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51 """Remove the exponent by changing intpart and fraction."""
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52 if expo > 0: # Move the point left
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53 f = len(fraction)
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54 intpart, fraction = intpart + fraction[:expo], fraction[expo:]
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55 if expo > f:
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56 intpart = intpart + '0'*(expo-f)
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57 elif expo < 0: # Move the point right
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58 i = len(intpart)
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59 intpart, fraction = intpart[:expo], intpart[expo:] + fraction
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60 if expo < -i:
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61 fraction = '0'*(-expo-i) + fraction
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62 return intpart, fraction
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63
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64 def roundfrac(intpart, fraction, digs):
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65 """Round or extend the fraction to size digs."""
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66 f = len(fraction)
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67 if f <= digs:
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68 return intpart, fraction + '0'*(digs-f)
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69 i = len(intpart)
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70 if i+digs < 0:
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71 return '0'*-digs, ''
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72 total = intpart + fraction
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73 nextdigit = total[i+digs]
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74 if nextdigit >= '5': # Hard case: increment last digit, may have carry!
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75 n = i + digs - 1
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76 while n >= 0:
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77 if total[n] != '9': break
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78 n = n-1
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79 else:
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80 total = '0' + total
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81 i = i+1
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82 n = 0
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83 total = total[:n] + chr(ord(total[n]) + 1) + '0'*(len(total)-n-1)
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84 intpart, fraction = total[:i], total[i:]
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85 if digs >= 0:
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86 return intpart, fraction[:digs]
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87 else:
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88 return intpart[:digs] + '0'*-digs, ''
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89
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90 def fix(x, digs):
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91 """Format x as [-]ddd.ddd with 'digs' digits after the point
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92 and at least one digit before.
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93 If digs <= 0, the point is suppressed."""
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94 if type(x) != type(''): x = repr(x)
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95 try:
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96 sign, intpart, fraction, expo = extract(x)
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97 except NotANumber:
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98 return x
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99 intpart, fraction = unexpo(intpart, fraction, expo)
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100 intpart, fraction = roundfrac(intpart, fraction, digs)
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101 while intpart and intpart[0] == '0': intpart = intpart[1:]
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102 if intpart == '': intpart = '0'
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103 if digs > 0: return sign + intpart + '.' + fraction
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104 else: return sign + intpart
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105
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106 def sci(x, digs):
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107 """Format x as [-]d.dddE[+-]ddd with 'digs' digits after the point
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108 and exactly one digit before.
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109 If digs is <= 0, one digit is kept and the point is suppressed."""
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110 if type(x) != type(''): x = repr(x)
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111 sign, intpart, fraction, expo = extract(x)
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112 if not intpart:
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113 while fraction and fraction[0] == '0':
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114 fraction = fraction[1:]
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115 expo = expo - 1
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116 if fraction:
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117 intpart, fraction = fraction[0], fraction[1:]
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118 expo = expo - 1
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119 else:
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120 intpart = '0'
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121 else:
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122 expo = expo + len(intpart) - 1
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123 intpart, fraction = intpart[0], intpart[1:] + fraction
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124 digs = max(0, digs)
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125 intpart, fraction = roundfrac(intpart, fraction, digs)
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126 if len(intpart) > 1:
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127 intpart, fraction, expo = \
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128 intpart[0], intpart[1:] + fraction[:-1], \
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129 expo + len(intpart) - 1
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130 s = sign + intpart
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 11691
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131 if digs > 0: s = s + '.' + fraction
31515
71a294bd7950 Replace backticks with repr() or "%r"
Walter Dörwald <walter@livinglogic.de>
parents: 16072
diff changeset
132 e = repr(abs(expo))
11706
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 11691
diff changeset
133 e = '0'*(3-len(e)) + e
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 11691
diff changeset
134 if expo < 0: e = '-' + e
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 11691
diff changeset
135 else: e = '+' + e
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 11691
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136 return s + 'e' + e
704
a8022b2a77e6 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
137
a8022b2a77e6 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
138 def test():
11706
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 11691
diff changeset
139 """Interactive test run."""
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 11691
diff changeset
140 try:
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 11691
diff changeset
141 while 1:
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 11691
diff changeset
142 x, digs = input('Enter (x, digs): ')
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 11691
diff changeset
143 print x, fix(x, digs), sci(x, digs)
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 11691
diff changeset
144 except (EOFError, KeyboardInterrupt):
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 11691
diff changeset
145 pass