Mercurial > cpython-lru_cache-weakref

annotate Lib/stringold.py @ 17581:c1937faabb23 2.1

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Added support for optional explanation parameter to the \versionadded macro. Refactored do_cmd_versionadded() and do_cmd_versionchanged() to do most of the work in a helper function, with the do_cmd_*() wrappers just supplying a portion of the replacement text.
author Fred Drake <fdrake@acm.org>
date Wed, 18 Apr 2001 17:29:14 +0000
parents f4e71bab7853
children 71a294bd7950
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1 # module 'string' -- A collection of string operations
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2
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3 # Warning: most of the code you see here isn't normally used nowadays. With
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4 # Python 1.6, many of these functions are implemented as methods on the
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5 # standard string object. They used to be implemented by a built-in module
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6 # called strop, but strop is now obsolete itself.
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7
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8 """Common string manipulations.
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9
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10 Public module variables:
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11
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12 whitespace -- a string containing all characters considered whitespace
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13 lowercase -- a string containing all characters considered lowercase letters
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14 uppercase -- a string containing all characters considered uppercase letters
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15 letters -- a string containing all characters considered letters
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16 digits -- a string containing all characters considered decimal digits
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17 hexdigits -- a string containing all characters considered hexadecimal digits
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18 octdigits -- a string containing all characters considered octal digits
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19
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20 """
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21
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22 # Some strings for ctype-style character classification
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23 whitespace = ' \t\n\r\v\f'
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24 lowercase = 'abcdefghijklmnopqrstuvwxyz'
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25 uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
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26 letters = lowercase + uppercase
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27 digits = '0123456789'
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28 hexdigits = digits + 'abcdef' + 'ABCDEF'
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29 octdigits = '01234567'
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31 # Case conversion helpers
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32 _idmap = ''
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33 for i in range(256): _idmap = _idmap + chr(i)
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34 del i
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35
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36 # Backward compatible names for exceptions
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37 index_error = ValueError
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38 atoi_error = ValueError
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39 atof_error = ValueError
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40 atol_error = ValueError
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41
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42 # convert UPPER CASE letters to lower case
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43 def lower(s):
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44 """lower(s) -> string
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45
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46 Return a copy of the string s converted to lowercase.
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47
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48 """
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49 return s.lower()
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50
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51 # Convert lower case letters to UPPER CASE
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52 def upper(s):
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53 """upper(s) -> string
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54
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55 Return a copy of the string s converted to uppercase.
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56
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57 """
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58 return s.upper()
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59
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60 # Swap lower case letters and UPPER CASE
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61 def swapcase(s):
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62 """swapcase(s) -> string
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63
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64 Return a copy of the string s with upper case characters
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65 converted to lowercase and vice versa.
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67 """
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68 return s.swapcase()
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69
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70 # Strip leading and trailing tabs and spaces
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71 def strip(s):
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72 """strip(s) -> string
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73
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74 Return a copy of the string s with leading and trailing
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75 whitespace removed.
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76
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77 """
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78 return s.strip()
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79
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80 # Strip leading tabs and spaces
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81 def lstrip(s):
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82 """lstrip(s) -> string
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83
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84 Return a copy of the string s with leading whitespace removed.
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85
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86 """
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87 return s.lstrip()
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88
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89 # Strip trailing tabs and spaces
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90 def rstrip(s):
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91 """rstrip(s) -> string
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92
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93 Return a copy of the string s with trailing whitespace
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94 removed.
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96 """
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97 return s.rstrip()
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99
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100 # Split a string into a list of space/tab-separated words
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101 def split(s, sep=None, maxsplit=0):
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102 """split(str [,sep [,maxsplit]]) -> list of strings
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103
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104 Return a list of the words in the string s, using sep as the
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105 delimiter string. If maxsplit is nonzero, splits into at most
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106 maxsplit words If sep is not specified, any whitespace string
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107 is a separator. Maxsplit defaults to 0.
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108
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109 (split and splitfields are synonymous)
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110
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111 """
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112 return s.split(sep, maxsplit)
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113 splitfields = split
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114
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115 # Join fields with optional separator
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116 def join(words, sep = ' '):
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117 """join(list [,sep]) -> string
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118
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119 Return a string composed of the words in list, with
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120 intervening occurrences of sep. The default separator is a
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121 single space.
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122
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123 (joinfields and join are synonymous)
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124
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125 """
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126 return sep.join(words)
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127 joinfields = join
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128
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129 # for a little bit of speed
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130 _apply = apply
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131
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132 # Find substring, raise exception if not found
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133 def index(s, *args):
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134 """index(s, sub [,start [,end]]) -> int
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135
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136 Like find but raises ValueError when the substring is not found.
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137
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138 """
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139 return _apply(s.index, args)
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140
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141 # Find last substring, raise exception if not found
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142 def rindex(s, *args):
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143 """rindex(s, sub [,start [,end]]) -> int
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144
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145 Like rfind but raises ValueError when the substring is not found.
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146
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147 """
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148 return _apply(s.rindex, args)
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149
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150 # Count non-overlapping occurrences of substring
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151 def count(s, *args):
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152 """count(s, sub[, start[,end]]) -> int
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153
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154 Return the number of occurrences of substring sub in string
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155 s[start:end]. Optional arguments start and end are
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156 interpreted as in slice notation.
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157
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158 """
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159 return _apply(s.count, args)
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160
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161 # Find substring, return -1 if not found
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162 def find(s, *args):
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163 """find(s, sub [,start [,end]]) -> in
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164
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165 Return the lowest index in s where substring sub is found,
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166 such that sub is contained within s[start,end]. Optional
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167 arguments start and end are interpreted as in slice notation.
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168
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169 Return -1 on failure.
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170
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171 """
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172 return _apply(s.find, args)
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173
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174 # Find last substring, return -1 if not found
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175 def rfind(s, *args):
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176 """rfind(s, sub [,start [,end]]) -> int
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177
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178 Return the highest index in s where substring sub is found,
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179 such that sub is contained within s[start,end]. Optional
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180 arguments start and end are interpreted as in slice notation.
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181
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182 Return -1 on failure.
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183
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184 """
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185 return _apply(s.rfind, args)
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186
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187 # for a bit of speed
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188 _float = float
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189 _int = int
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190 _long = long
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191 _StringType = type('')
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192
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193 # Convert string to float
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194 def atof(s):
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195 """atof(s) -> float
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196
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197 Return the floating point number represented by the string s.
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198
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199 """
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200 if type(s) == _StringType:
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201 return _float(s)
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202 else:
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203 raise TypeError('argument 1: expected string, %s found' %
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204 type(s).__name__)
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205
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206 # Convert string to integer
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207 def atoi(*args):
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208 """atoi(s [,base]) -> int
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209
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210 Return the integer represented by the string s in the given
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211 base, which defaults to 10. The string s must consist of one
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212 or more digits, possibly preceded by a sign. If base is 0, it
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213 is chosen from the leading characters of s, 0 for octal, 0x or
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214 0X for hexadecimal. If base is 16, a preceding 0x or 0X is
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215 accepted.
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216
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217 """
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218 try:
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219 s = args[0]
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220 except IndexError:
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221 raise TypeError('function requires at least 1 argument: %d given' %
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222 len(args))
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223 # Don't catch type error resulting from too many arguments to int(). The
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224 # error message isn't compatible but the error type is, and this function
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225 # is complicated enough already.
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226 if type(s) == _StringType:
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227 return _apply(_int, args)
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228 else:
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229 raise TypeError('argument 1: expected string, %s found' %
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230 type(s).__name__)
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231
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232
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233 # Convert string to long integer
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234 def atol(*args):
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235 """atol(s [,base]) -> long
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236
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237 Return the long integer represented by the string s in the
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238 given base, which defaults to 10. The string s must consist
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239 of one or more digits, possibly preceded by a sign. If base
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240 is 0, it is chosen from the leading characters of s, 0 for
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241 octal, 0x or 0X for hexadecimal. If base is 16, a preceding
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242 0x or 0X is accepted. A trailing L or l is not accepted,
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243 unless base is 0.
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244
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245 """
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246 try:
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247 s = args[0]
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248 except IndexError:
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249 raise TypeError('function requires at least 1 argument: %d given' %
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250 len(args))
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251 # Don't catch type error resulting from too many arguments to long(). The
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252 # error message isn't compatible but the error type is, and this function
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253 # is complicated enough already.
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254 if type(s) == _StringType:
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255 return _apply(_long, args)
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256 else:
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257 raise TypeError('argument 1: expected string, %s found' %
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258 type(s).__name__)
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259
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260
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261 # Left-justify a string
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262 def ljust(s, width):
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263 """ljust(s, width) -> string
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264
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265 Return a left-justified version of s, in a field of the
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266 specified width, padded with spaces as needed. The string is
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267 never truncated.
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268
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269 """
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270 n = width - len(s)
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271 if n <= 0: return s
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272 return s + ' '*n
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273
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274 # Right-justify a string
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275 def rjust(s, width):
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276 """rjust(s, width) -> string
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277
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278 Return a right-justified version of s, in a field of the
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279 specified width, padded with spaces as needed. The string is
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280 never truncated.
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281
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282 """
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283 n = width - len(s)
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284 if n <= 0: return s
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285 return ' '*n + s
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286
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287 # Center a string
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288 def center(s, width):
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289 """center(s, width) -> string
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290
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291 Return a center version of s, in a field of the specified
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292 width. padded with spaces as needed. The string is never
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293 truncated.
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294
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295 """
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296 n = width - len(s)
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297 if n <= 0: return s
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298 half = n/2
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299 if n%2 and width%2:
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300 # This ensures that center(center(s, i), j) = center(s, j)
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301 half = half+1
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302 return ' '*half + s + ' '*(n-half)
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303
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304 # Zero-fill a number, e.g., (12, 3) --> '012' and (-3, 3) --> '-03'
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305 # Decadent feature: the argument may be a string or a number
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306 # (Use of this is deprecated; it should be a string as with ljust c.s.)
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307 def zfill(x, width):
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308 """zfill(x, width) -> string
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309
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310 Pad a numeric string x with zeros on the left, to fill a field
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311 of the specified width. The string x is never truncated.
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312
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313 """
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314 if type(x) == type(''): s = x
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315 else: s = `x`
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316 n = len(s)
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317 if n >= width: return s
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318 sign = ''
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319 if s[0] in ('-', '+'):
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320 sign, s = s[0], s[1:]
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321 return sign + '0'*(width-n) + s
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322
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323 # Expand tabs in a string.
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324 # Doesn't take non-printing chars into account, but does understand \n.
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325 def expandtabs(s, tabsize=8):
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326 """expandtabs(s [,tabsize]) -> string
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327
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328 Return a copy of the string s with all tab characters replaced
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329 by the appropriate number of spaces, depending on the current
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330 column, and the tabsize (default 8).
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331
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332 """
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333 res = line = ''
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334 for c in s:
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335 if c == '\t':
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336 c = ' '*(tabsize - len(line) % tabsize)
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337 line = line + c
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338 if c == '\n':
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339 res = res + line
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340 line = ''
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341 return res + line
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342
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343 # Character translation through look-up table.
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344 def translate(s, table, deletions=""):
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345 """translate(s,table [,deletechars]) -> string
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346
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347 Return a copy of the string s, where all characters occurring
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348 in the optional argument deletechars are removed, and the
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349 remaining characters have been mapped through the given
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350 translation table, which must be a string of length 256.
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351
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352 """
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353 return s.translate(table, deletions)
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354
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355 # Capitalize a string, e.g. "aBc dEf" -> "Abc def".
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356 def capitalize(s):
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357 """capitalize(s) -> string
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358
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359 Return a copy of the string s with only its first character
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360 capitalized.
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361
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362 """
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363 return s.capitalize()
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364
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365 # Capitalize the words in a string, e.g. " aBc dEf " -> "Abc Def".
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366 # See also regsub.capwords().
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367 def capwords(s, sep=None):
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368 """capwords(s, [sep]) -> string
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369
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370 Split the argument into words using split, capitalize each
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371 word using capitalize, and join the capitalized words using
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372 join. Note that this replaces runs of whitespace characters by
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373 a single space.
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374
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375 """
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376 return join(map(capitalize, s.split(sep)), sep or ' ')
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377
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378 # Construct a translation string
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379 _idmapL = None
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380 def maketrans(fromstr, tostr):
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381 """maketrans(frm, to) -> string
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382
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383 Return a translation table (a string of 256 bytes long)
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384 suitable for use in string.translate. The strings frm and to
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385 must be of the same length.
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386
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387 """
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388 if len(fromstr) != len(tostr):
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389 raise ValueError, "maketrans arguments must have same length"
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390 global _idmapL
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391 if not _idmapL:
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392 _idmapL = map(None, _idmap)
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393 L = _idmapL[:]
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394 fromstr = map(ord, fromstr)
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395 for i in range(len(fromstr)):
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396 L[fromstr[i]] = tostr[i]
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397 return join(L, "")
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398
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399 # Substring replacement (global)
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400 def replace(s, old, new, maxsplit=0):
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401 """replace (str, old, new[, maxsplit]) -> string
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402
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403 Return a copy of string str with all occurrences of substring
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404 old replaced by new. If the optional argument maxsplit is
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405 given, only the first maxsplit occurrences are replaced.
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406
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407 """
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408 return s.replace(old, new, maxsplit)
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409
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410
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411 # XXX: transitional
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412 #
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413 # If string objects do not have methods, then we need to use the old string.py
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414 # library, which uses strop for many more things than just the few outlined
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415 # below.
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416 try:
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417 ''.upper
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418 except AttributeError:
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419 from stringold import *
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420
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Guido van Rossum <guido@python.org>
parents: 1052
diff changeset
421 # Try importing optional built-in module "strop" -- if it exists,
245003c006a6 Misc changes and new modules. whrandom is "objectified". SOCKET.py
Guido van Rossum <guido@python.org>
parents: 1052
diff changeset
422 # it redefines some string operations that are 100-1000 times faster.
1331
07900834cc97 * pdb.py: set 'privileged' property when evaluating expressions
Guido van Rossum <guido@python.org>
parents: 1291
diff changeset
423 # It also defines values for whitespace, lowercase and uppercase
07900834cc97 * pdb.py: set 'privileged' property when evaluating expressions
Guido van Rossum <guido@python.org>
parents: 1291
diff changeset
424 # that match <ctype.h>'s definitions.
1078
245003c006a6 Misc changes and new modules. whrandom is "objectified". SOCKET.py
Guido van Rossum <guido@python.org>
parents: 1052
diff changeset
425
245003c006a6 Misc changes and new modules. whrandom is "objectified". SOCKET.py
Guido van Rossum <guido@python.org>
parents: 1052
diff changeset
426 try:
11383
aca7b5eaf5e8 Mainlining the string_methods branch. See branch revision log
Barry Warsaw <barry@python.org>
parents: 8091
diff changeset
427 from strop import maketrans, lowercase, uppercase, whitespace
aca7b5eaf5e8 Mainlining the string_methods branch. See branch revision log
Barry Warsaw <barry@python.org>
parents: 8091
diff changeset
428 letters = lowercase + uppercase
1746
1940892d2fe3 Merge alpha100 branch back to main trunk
Guido van Rossum <guido@python.org>
parents: 1403
diff changeset
429 except ImportError:
11742
840e18eec07f Untabify to pass the -tt test.
Fred Drake <fdrake@acm.org>
parents: 11383
diff changeset
430 pass # Use the original versions