Mercurial > cpython-lru_cache-weakref
annotate Lib/stringold.py @ 80661:94de77bd0b4b 2.7
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 | 49726dca16d8 |
| children |
| rev | line source |
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| 5 | 1 # module 'string' -- A collection of string operations |
| 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. |
| 5 | 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 from warnings import warnpy3k |
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22 warnpy3k("the stringold module has been removed in Python 3.0", stacklevel=2) |
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23 del warnpy3k |
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24 |
| 5 | 25 # Some strings for ctype-style character classification |
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26 whitespace = ' \t\n\r\v\f' |
| 5 | 27 lowercase = 'abcdefghijklmnopqrstuvwxyz' |
| 28 uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' | |
| 29 letters = lowercase + uppercase | |
| 30 digits = '0123456789' | |
| 31 hexdigits = digits + 'abcdef' + 'ABCDEF' | |
| 32 octdigits = '01234567' | |
| 33 | |
| 34 # Case conversion helpers | |
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35 _idmap = '' |
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36 for i in range(256): _idmap = _idmap + chr(i) |
| 5 | 37 del i |
| 38 | |
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39 # Backward compatible names for exceptions |
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40 index_error = ValueError |
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41 atoi_error = ValueError |
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42 atof_error = ValueError |
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43 atol_error = ValueError |
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44 |
| 5 | 45 # convert UPPER CASE letters to lower case |
| 46 def lower(s): | |
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47 """lower(s) -> string |
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48 |
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49 Return a copy of the string s converted to lowercase. |
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50 |
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51 """ |
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52 return s.lower() |
| 5 | 53 |
| 54 # Convert lower case letters to UPPER CASE | |
| 55 def upper(s): | |
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56 """upper(s) -> string |
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57 |
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58 Return a copy of the string s converted to uppercase. |
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59 |
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60 """ |
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61 return s.upper() |
| 5 | 62 |
| 63 # Swap lower case letters and UPPER CASE | |
| 64 def swapcase(s): | |
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65 """swapcase(s) -> string |
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66 |
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67 Return a copy of the string s with upper case characters |
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68 converted to lowercase and vice versa. |
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69 |
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70 """ |
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71 return s.swapcase() |
| 5 | 72 |
| 73 # Strip leading and trailing tabs and spaces | |
| 74 def strip(s): | |
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75 """strip(s) -> string |
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76 |
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77 Return a copy of the string s with leading and trailing |
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78 whitespace removed. |
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79 |
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80 """ |
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81 return s.strip() |
| 5 | 82 |
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83 # Strip leading tabs and spaces |
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84 def lstrip(s): |
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85 """lstrip(s) -> string |
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86 |
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87 Return a copy of the string s with leading whitespace removed. |
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88 |
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89 """ |
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90 return s.lstrip() |
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91 |
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92 # Strip trailing tabs and spaces |
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93 def rstrip(s): |
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94 """rstrip(s) -> string |
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95 |
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96 Return a copy of the string s with trailing whitespace |
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97 removed. |
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98 |
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99 """ |
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100 return s.rstrip() |
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101 |
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102 |
| 5 | 103 # Split a string into a list of space/tab-separated words |
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104 def split(s, sep=None, maxsplit=0): |
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105 """split(str [,sep [,maxsplit]]) -> list of strings |
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106 |
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107 Return a list of the words in the string s, using sep as the |
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108 delimiter string. If maxsplit is nonzero, splits into at most |
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109 maxsplit words If sep is not specified, any whitespace string |
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110 is a separator. Maxsplit defaults to 0. |
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111 |
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112 (split and splitfields are synonymous) |
| 5 | 113 |
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114 """ |
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115 return s.split(sep, maxsplit) |
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116 splitfields = split |
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117 |
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118 # Join fields with optional separator |
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119 def join(words, sep = ' '): |
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120 """join(list [,sep]) -> string |
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121 |
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122 Return a string composed of the words in list, with |
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123 intervening occurrences of sep. The default separator is a |
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124 single space. |
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125 |
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126 (joinfields and join are synonymous) |
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127 |
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128 """ |
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129 return sep.join(words) |
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130 joinfields = join |
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131 |
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132 # for a little bit of speed |
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133 _apply = apply |
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134 |
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135 # Find substring, raise exception if not found |
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136 def index(s, *args): |
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137 """index(s, sub [,start [,end]]) -> int |
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138 |
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139 Like find but raises ValueError when the substring is not found. |
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140 |
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141 """ |
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142 return _apply(s.index, args) |
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143 |
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144 # Find last substring, raise exception if not found |
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145 def rindex(s, *args): |
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146 """rindex(s, sub [,start [,end]]) -> int |
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147 |
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148 Like rfind but raises ValueError when the substring is not found. |
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149 |
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150 """ |
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151 return _apply(s.rindex, args) |
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152 |
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153 # Count non-overlapping occurrences of substring |
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154 def count(s, *args): |
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155 """count(s, sub[, start[,end]]) -> int |
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156 |
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157 Return the number of occurrences of substring sub in string |
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158 s[start:end]. Optional arguments start and end are |
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159 interpreted as in slice notation. |
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160 |
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161 """ |
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162 return _apply(s.count, args) |
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163 |
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164 # Find substring, return -1 if not found |
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165 def find(s, *args): |
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166 """find(s, sub [,start [,end]]) -> in |
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167 |
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168 Return the lowest index in s where substring sub is found, |
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169 such that sub is contained within s[start,end]. Optional |
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170 arguments start and end are interpreted as in slice notation. |
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171 |
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172 Return -1 on failure. |
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173 |
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174 """ |
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175 return _apply(s.find, args) |
| 5 | 176 |
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177 # Find last substring, return -1 if not found |
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178 def rfind(s, *args): |
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179 """rfind(s, sub [,start [,end]]) -> int |
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180 |
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181 Return the highest index in s where substring sub is found, |
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182 such that sub is contained within s[start,end]. Optional |
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183 arguments start and end are interpreted as in slice notation. |
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184 |
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185 Return -1 on failure. |
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186 |
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187 """ |
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188 return _apply(s.rfind, args) |
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189 |
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190 # for a bit of speed |
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191 _float = float |
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192 _int = int |
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193 _long = long |
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194 _StringType = type('') |
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195 |
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196 # Convert string to float |
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197 def atof(s): |
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198 """atof(s) -> float |
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199 |
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200 Return the floating point number represented by the string s. |
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201 |
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202 """ |
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203 if type(s) == _StringType: |
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204 return _float(s) |
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205 else: |
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206 raise TypeError('argument 1: expected string, %s found' % |
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207 type(s).__name__) |
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208 |
| 5 | 209 # Convert string to integer |
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210 def atoi(*args): |
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211 """atoi(s [,base]) -> int |
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212 |
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213 Return the integer represented by the string s in the given |
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214 base, which defaults to 10. The string s must consist of one |
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215 or more digits, possibly preceded by a sign. If base is 0, it |
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216 is chosen from the leading characters of s, 0 for octal, 0x or |
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217 0X for hexadecimal. If base is 16, a preceding 0x or 0X is |
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218 accepted. |
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219 |
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220 """ |
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221 try: |
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222 s = args[0] |
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223 except IndexError: |
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224 raise TypeError('function requires at least 1 argument: %d given' % |
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225 len(args)) |
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226 # Don't catch type error resulting from too many arguments to int(). The |
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227 # error message isn't compatible but the error type is, and this function |
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228 # is complicated enough already. |
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229 if type(s) == _StringType: |
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230 return _apply(_int, args) |
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231 else: |
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232 raise TypeError('argument 1: expected string, %s found' % |
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233 type(s).__name__) |
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234 |
| 5 | 235 |
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236 # Convert string to long integer |
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237 def atol(*args): |
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238 """atol(s [,base]) -> long |
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239 |
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240 Return the long integer represented by the string s in the |
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241 given base, which defaults to 10. The string s must consist |
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242 of one or more digits, possibly preceded by a sign. If base |
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243 is 0, it is chosen from the leading characters of s, 0 for |
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244 octal, 0x or 0X for hexadecimal. If base is 16, a preceding |
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245 0x or 0X is accepted. A trailing L or l is not accepted, |
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246 unless base is 0. |
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247 |
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248 """ |
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249 try: |
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250 s = args[0] |
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251 except IndexError: |
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252 raise TypeError('function requires at least 1 argument: %d given' % |
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253 len(args)) |
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254 # Don't catch type error resulting from too many arguments to long(). The |
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255 # error message isn't compatible but the error type is, and this function |
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256 # is complicated enough already. |
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257 if type(s) == _StringType: |
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258 return _apply(_long, args) |
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259 else: |
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260 raise TypeError('argument 1: expected string, %s found' % |
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261 type(s).__name__) |
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262 |
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263 |
| 5 | 264 # Left-justify a string |
| 265 def ljust(s, width): | |
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266 """ljust(s, width) -> string |
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267 |
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268 Return a left-justified version of s, in a field of the |
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269 specified width, padded with spaces as needed. The string is |
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270 never truncated. |
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271 |
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272 """ |
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273 n = width - len(s) |
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274 if n <= 0: return s |
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275 return s + ' '*n |
| 5 | 276 |
| 277 # Right-justify a string | |
| 278 def rjust(s, width): | |
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279 """rjust(s, width) -> string |
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280 |
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281 Return a right-justified version of s, in a field of the |
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282 specified width, padded with spaces as needed. The string is |
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283 never truncated. |
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284 |
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285 """ |
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286 n = width - len(s) |
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287 if n <= 0: return s |
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288 return ' '*n + s |
| 5 | 289 |
| 290 # Center a string | |
| 291 def center(s, width): | |
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292 """center(s, width) -> string |
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293 |
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294 Return a center version of s, in a field of the specified |
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295 width. padded with spaces as needed. The string is never |
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296 truncated. |
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297 |
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298 """ |
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299 n = width - len(s) |
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300 if n <= 0: return s |
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301 half = n/2 |
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302 if n%2 and width%2: |
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303 # This ensures that center(center(s, i), j) = center(s, j) |
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304 half = half+1 |
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305 return ' '*half + s + ' '*(n-half) |
| 5 | 306 |
| 307 # Zero-fill a number, e.g., (12, 3) --> '012' and (-3, 3) --> '-03' | |
| 308 # Decadent feature: the argument may be a string or a number | |
| 309 # (Use of this is deprecated; it should be a string as with ljust c.s.) | |
| 310 def zfill(x, width): | |
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311 """zfill(x, width) -> string |
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312 |
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313 Pad a numeric string x with zeros on the left, to fill a field |
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314 of the specified width. The string x is never truncated. |
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315 |
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316 """ |
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317 if type(x) == type(''): s = x |
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318 else: s = repr(x) |
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319 n = len(s) |
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320 if n >= width: return s |
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321 sign = '' |
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322 if s[0] in ('-', '+'): |
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323 sign, s = s[0], s[1:] |
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324 return sign + '0'*(width-n) + s |
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325 |
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326 # Expand tabs in a string. |
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327 # Doesn't take non-printing chars into account, but does understand \n. |
| 2958 | 328 def expandtabs(s, tabsize=8): |
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329 """expandtabs(s [,tabsize]) -> string |
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330 |
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331 Return a copy of the string s with all tab characters replaced |
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332 by the appropriate number of spaces, depending on the current |
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333 column, and the tabsize (default 8). |
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334 |
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335 """ |
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336 res = line = '' |
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337 for c in s: |
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338 if c == '\t': |
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339 c = ' '*(tabsize - len(line) % tabsize) |
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340 line = line + c |
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341 if c == '\n': |
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342 res = res + line |
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343 line = '' |
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344 return res + line |
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345 |
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346 # Character translation through look-up table. |
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347 def translate(s, table, deletions=""): |
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348 """translate(s,table [,deletechars]) -> string |
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349 |
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350 Return a copy of the string s, where all characters occurring |
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351 in the optional argument deletechars are removed, and the |
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352 remaining characters have been mapped through the given |
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353 translation table, which must be a string of length 256. |
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354 |
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355 """ |
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356 return s.translate(table, deletions) |
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357 |
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358 # Capitalize a string, e.g. "aBc dEf" -> "Abc def". |
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359 def capitalize(s): |
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360 """capitalize(s) -> string |
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361 |
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362 Return a copy of the string s with only its first character |
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363 capitalized. |
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364 |
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365 """ |
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366 return s.capitalize() |
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367 |
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368 # Capitalize the words in a string, e.g. " aBc dEf " -> "Abc Def". |
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369 def capwords(s, sep=None): |
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370 """capwords(s, [sep]) -> string |
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371 |
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372 Split the argument into words using split, capitalize each |
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373 word using capitalize, and join the capitalized words using |
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374 join. Note that this replaces runs of whitespace characters by |
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375 a single space. |
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376 |
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377 """ |
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378 return join(map(capitalize, s.split(sep)), sep or ' ') |
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379 |
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380 # Construct a translation string |
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381 _idmapL = None |
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382 def maketrans(fromstr, tostr): |
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383 """maketrans(frm, to) -> string |
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384 |
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385 Return a translation table (a string of 256 bytes long) |
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386 suitable for use in string.translate. The strings frm and to |
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387 must be of the same length. |
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388 |
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389 """ |
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390 if len(fromstr) != len(tostr): |
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391 raise ValueError, "maketrans arguments must have same length" |
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392 global _idmapL |
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393 if not _idmapL: |
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394 _idmapL = list(_idmap) |
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395 L = _idmapL[:] |
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396 fromstr = map(ord, fromstr) |
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397 for i in range(len(fromstr)): |
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398 L[fromstr[i]] = tostr[i] |
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399 return join(L, "") |
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400 |
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401 # Substring replacement (global) |
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402 def replace(s, old, new, maxsplit=0): |
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403 """replace (str, old, new[, maxsplit]) -> string |
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404 |
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405 Return a copy of string str with all occurrences of substring |
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406 old replaced by new. If the optional argument maxsplit is |
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407 given, only the first maxsplit occurrences are replaced. |
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408 |
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409 """ |
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410 return s.replace(old, new, maxsplit) |
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411 |
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412 |
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413 # XXX: transitional |
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414 # |
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415 # If string objects do not have methods, then we need to use the old string.py |
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416 # library, which uses strop for many more things than just the few outlined |
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417 # below. |
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418 try: |
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419 ''.upper |
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420 except AttributeError: |
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421 from stringold import * |
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422 |
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423 # Try importing optional built-in module "strop" -- if it exists, |
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424 # it redefines some string operations that are 100-1000 times faster. |
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425 # It also defines values for whitespace, lowercase and uppercase |
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426 # that match <ctype.h>'s definitions. |
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427 |
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428 try: |
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429 from strop import maketrans, lowercase, uppercase, whitespace |
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430 letters = lowercase + uppercase |
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431 except ImportError: |
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432 pass # Use the original versions |