Mercurial > cpython-lru_cache-weakref

annotate Lib/fpformat.py @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents bae889f44cd1
children 71a294bd7950
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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
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14 import re
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15
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16 __all__ = ["fix","sci","NotANumber"]
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17
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18 # Compiled regular expression to "decode" a number
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19 decoder = re.compile(r'^([-+]?)0*(\d*)((?:\.\d*)?)(([eE][-+]?\d+)?)$')
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20 # \0 the whole thing
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21 # \1 leading sign or empty
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22 # \2 digits left of decimal point
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23 # \3 fraction (empty or begins with point)
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24 # \4 exponent part (empty or begins with 'e' or 'E')
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25
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26 try:
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27 class NotANumber(ValueError):
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28 pass
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29 except TypeError:
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30 NotANumber = 'fpformat.NotANumber'
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31
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32 def extract(s):
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33 """Return (sign, intpart, fraction, expo) or raise an exception:
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34 sign is '+' or '-'
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35 intpart is 0 or more digits beginning with a nonzero
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36 fraction is 0 or more digits
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37 expo is an integer"""
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38 res = decoder.match(s)
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39 if res is None: raise NotANumber, s
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40 sign, intpart, fraction, exppart = res.group(1,2,3,4)
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41 if sign == '+': sign = ''
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42 if fraction: fraction = fraction[1:]
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43 if exppart: expo = int(exppart[1:])
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44 else: expo = 0
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45 return sign, intpart, fraction, expo
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46
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47 def unexpo(intpart, fraction, expo):
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48 """Remove the exponent by changing intpart and fraction."""
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49 if expo > 0: # Move the point left
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50 f = len(fraction)
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51 intpart, fraction = intpart + fraction[:expo], fraction[expo:]
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52 if expo > f:
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53 intpart = intpart + '0'*(expo-f)
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54 elif expo < 0: # Move the point right
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55 i = len(intpart)
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56 intpart, fraction = intpart[:expo], intpart[expo:] + fraction
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57 if expo < -i:
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58 fraction = '0'*(-expo-i) + fraction
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59 return intpart, fraction
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60
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61 def roundfrac(intpart, fraction, digs):
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62 """Round or extend the fraction to size digs."""
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63 f = len(fraction)
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64 if f <= digs:
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65 return intpart, fraction + '0'*(digs-f)
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66 i = len(intpart)
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67 if i+digs < 0:
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68 return '0'*-digs, ''
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69 total = intpart + fraction
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70 nextdigit = total[i+digs]
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71 if nextdigit >= '5': # Hard case: increment last digit, may have carry!
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72 n = i + digs - 1
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73 while n >= 0:
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74 if total[n] != '9': break
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75 n = n-1
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76 else:
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77 total = '0' + total
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78 i = i+1
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79 n = 0
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80 total = total[:n] + chr(ord(total[n]) + 1) + '0'*(len(total)-n-1)
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81 intpart, fraction = total[:i], total[i:]
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82 if digs >= 0:
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83 return intpart, fraction[:digs]
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84 else:
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85 return intpart[:digs] + '0'*-digs, ''
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86
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87 def fix(x, digs):
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88 """Format x as [-]ddd.ddd with 'digs' digits after the point
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89 and at least one digit before.
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90 If digs <= 0, the point is suppressed."""
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91 if type(x) != type(''): x = `x`
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92 try:
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93 sign, intpart, fraction, expo = extract(x)
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94 except NotANumber:
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95 return x
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96 intpart, fraction = unexpo(intpart, fraction, expo)
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97 intpart, fraction = roundfrac(intpart, fraction, digs)
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98 while intpart and intpart[0] == '0': intpart = intpart[1:]
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99 if intpart == '': intpart = '0'
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100 if digs > 0: return sign + intpart + '.' + fraction
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101 else: return sign + intpart
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102
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103 def sci(x, digs):
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104 """Format x as [-]d.dddE[+-]ddd with 'digs' digits after the point
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105 and exactly one digit before.
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106 If digs is <= 0, one digit is kept and the point is suppressed."""
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107 if type(x) != type(''): x = `x`
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108 sign, intpart, fraction, expo = extract(x)
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109 if not intpart:
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110 while fraction and fraction[0] == '0':
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111 fraction = fraction[1:]
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112 expo = expo - 1
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113 if fraction:
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114 intpart, fraction = fraction[0], fraction[1:]
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115 expo = expo - 1
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116 else:
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117 intpart = '0'
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118 else:
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119 expo = expo + len(intpart) - 1
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120 intpart, fraction = intpart[0], intpart[1:] + fraction
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121 digs = max(0, digs)
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122 intpart, fraction = roundfrac(intpart, fraction, digs)
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123 if len(intpart) > 1:
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124 intpart, fraction, expo = \
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125 intpart[0], intpart[1:] + fraction[:-1], \
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126 expo + len(intpart) - 1
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127 s = sign + intpart
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128 if digs > 0: s = s + '.' + fraction
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129 e = `abs(expo)`
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130 e = '0'*(3-len(e)) + e
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131 if expo < 0: e = '-' + e
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132 else: e = '+' + e
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133 return s + 'e' + e
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134
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135 def test():
11706
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136 """Interactive test run."""
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137 try:
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138 while 1:
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139 x, digs = input('Enter (x, digs): ')
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140 print x, fix(x, digs), sci(x, digs)
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141 except (EOFError, KeyboardInterrupt):
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parents: 11691
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142 pass