Mercurial > cpython-lru_cache-weakref
annotate Lib/string.py @ 5792:dffabc620e4e legacy-trunk
Tweak re_tests and test_re to differentiate between
groups that have no value and groups that are out of bounds.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Tue, 15 Jul 1997 15:49:52 +0000 |
| parents | 247139d200e8 |
| children | 071a0d3a49b9 |
| rev | line source |
|---|---|
| 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. |
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4 # At the end of this file most functions are replaced by built-in |
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5 # functions imported from built-in module "strop". |
| 5 | 6 |
| 7 # Some strings for ctype-style character classification | |
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8 whitespace = ' \t\n\r\v\f' |
| 5 | 9 lowercase = 'abcdefghijklmnopqrstuvwxyz' |
| 10 uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' | |
| 11 letters = lowercase + uppercase | |
| 12 digits = '0123456789' | |
| 13 hexdigits = digits + 'abcdef' + 'ABCDEF' | |
| 14 octdigits = '01234567' | |
| 15 | |
| 16 # Case conversion helpers | |
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17 _idmap = '' |
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18 for i in range(256): _idmap = _idmap + chr(i) |
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19 _lower = _idmap[:ord('A')] + lowercase + _idmap[ord('Z')+1:] |
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20 _upper = _idmap[:ord('a')] + uppercase + _idmap[ord('z')+1:] |
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21 _swapcase = _upper[:ord('A')] + lowercase + _upper[ord('Z')+1:] |
| 5 | 22 del i |
| 23 | |
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24 # Backward compatible names for exceptions |
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25 index_error = ValueError |
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26 atoi_error = ValueError |
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27 atof_error = ValueError |
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28 atol_error = ValueError |
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29 |
| 5 | 30 # convert UPPER CASE letters to lower case |
| 31 def lower(s): | |
| 32 res = '' | |
| 33 for c in s: | |
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34 res = res + _lower[ord(c)] |
| 5 | 35 return res |
| 36 | |
| 37 # Convert lower case letters to UPPER CASE | |
| 38 def upper(s): | |
| 39 res = '' | |
| 40 for c in s: | |
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41 res = res + _upper[ord(c)] |
| 5 | 42 return res |
| 43 | |
| 44 # Swap lower case letters and UPPER CASE | |
| 45 def swapcase(s): | |
| 46 res = '' | |
| 47 for c in s: | |
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48 res = res + _swapcase[ord(c)] |
| 5 | 49 return res |
| 50 | |
| 51 # Strip leading and trailing tabs and spaces | |
| 52 def strip(s): | |
| 53 i, j = 0, len(s) | |
| 54 while i < j and s[i] in whitespace: i = i+1 | |
| 55 while i < j and s[j-1] in whitespace: j = j-1 | |
| 56 return s[i:j] | |
| 57 | |
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58 # Strip leading tabs and spaces |
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59 def lstrip(s): |
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60 i, j = 0, len(s) |
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61 while i < j and s[i] in whitespace: i = i+1 |
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62 return s[i:j] |
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63 |
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64 # Strip trailing tabs and spaces |
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65 def rstrip(s): |
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66 i, j = 0, len(s) |
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67 while i < j and s[j-1] in whitespace: j = j-1 |
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68 return s[i:j] |
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69 |
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70 |
| 5 | 71 # Split a string into a list of space/tab-separated words |
| 72 # NB: split(s) is NOT the same as splitfields(s, ' ')! | |
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73 def split(s, sep=None, maxsplit=0): |
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74 if sep is not None: return splitfields(s, sep, maxsplit) |
| 5 | 75 res = [] |
| 76 i, n = 0, len(s) | |
| 77 while i < n: | |
| 78 while i < n and s[i] in whitespace: i = i+1 | |
| 559 | 79 if i == n: break |
| 5 | 80 j = i |
| 81 while j < n and s[j] not in whitespace: j = j+1 | |
| 82 res.append(s[i:j]) | |
| 83 i = j | |
| 84 return res | |
| 85 | |
| 86 # Split a list into fields separated by a given string | |
| 87 # NB: splitfields(s, ' ') is NOT the same as split(s)! | |
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88 # splitfields(s, '') returns [s] (in analogy with split() in nawk) |
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89 def splitfields(s, sep=None, maxsplit=0): |
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90 if sep is None: return split(s, None, maxsplit) |
| 5 | 91 res = [] |
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92 nsep = len(sep) |
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93 if nsep == 0: |
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94 return [s] |
| 5 | 95 ns = len(s) |
| 96 i = j = 0 | |
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97 count = 0 |
| 5 | 98 while j+nsep <= ns: |
| 559 | 99 if s[j:j+nsep] == sep: |
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100 count = count + 1 |
| 5 | 101 res.append(s[i:j]) |
| 102 i = j = j + nsep | |
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103 if (maxsplit and (count >= maxsplit)): |
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104 break |
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105 |
| 5 | 106 else: |
| 107 j = j + 1 | |
| 108 res.append(s[i:]) | |
| 109 return res | |
| 110 | |
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111 # Join words with spaces between them |
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112 def join(words, sep = ' '): |
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113 return joinfields(words, sep) |
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114 |
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115 # Join fields with optional separator |
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116 def joinfields(words, sep = ' '): |
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117 res = '' |
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118 for w in words: |
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119 res = res + (sep + w) |
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120 return res[len(sep):] |
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121 |
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122 # Find substring, raise exception if not found |
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123 def index(s, sub, i = 0, last=None): |
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124 if last == None: last = len(s) |
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125 res = find(s, sub, i, last) |
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126 if res < 0: |
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127 raise ValueError, 'substring not found in string.index' |
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128 return res |
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129 |
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130 # Find last substring, raise exception if not found |
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131 def rindex(s, sub, i = 0, last=None): |
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132 if last == None: last = len(s) |
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133 res = rfind(s, sub, i, last) |
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134 if res < 0: |
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135 raise ValueError, 'substring not found in string.index' |
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136 return res |
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137 |
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138 # Count non-overlapping occurrences of substring |
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139 def count(s, sub, i = 0): |
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140 if i < 0: i = max(0, i + len(s)) |
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141 n = len(sub) |
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142 m = len(s) + 1 - n |
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143 if n == 0: return m-i |
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144 r = 0 |
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145 while i < m: |
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146 if sub == s[i:i+n]: |
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147 r = r+1 |
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148 i = i+n |
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149 else: |
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150 i = i+1 |
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151 return r |
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152 |
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153 # Find substring, return -1 if not found |
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154 def find(s, sub, i = 0, last=None): |
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155 Slen = len(s) # cache this value, for speed |
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156 if last == None: |
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157 last = Slen |
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158 elif last < 0: |
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159 last = max(0, last + Slen) |
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160 elif last > Slen: |
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161 last = Slen |
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162 if i < 0: i = max(0, i + Slen) |
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163 n = len(sub) |
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164 m = last + 1 - n |
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165 while i < m: |
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166 if sub == s[i:i+n]: return i |
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167 i = i+1 |
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168 return -1 |
| 5 | 169 |
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170 # Find last substring, return -1 if not found |
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171 def rfind(s, sub, i = 0, last=None): |
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172 Slen = len(s) # cache this value, for speed |
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173 if last == None: |
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174 last = Slen |
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175 elif last < 0: |
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176 last = max(0, last + Slen) |
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177 elif last > Slen: |
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178 last = Slen |
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179 if i < 0: i = max(0, i + Slen) |
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180 n = len(sub) |
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181 m = last + 1 - n |
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182 r = -1 |
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183 while i < m: |
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184 if sub == s[i:i+n]: r = i |
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185 i = i+1 |
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186 return r |
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187 |
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188 # Convert string to float |
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189 def atof(str): |
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190 import regex |
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191 sign = '' |
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192 s = str |
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193 if s and s[0] in '+-': |
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194 sign = s[0] |
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195 s = s[1:] |
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196 if not s: |
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197 raise ValueError, 'non-float argument to string.atof' |
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198 while s[0] == '0' and len(s) > 1 and s[1] in digits: s = s[1:] |
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199 if regex.match('[0-9]*\(\.[0-9]*\)?\([eE][-+]?[0-9]+\)?', s) != len(s): |
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200 raise ValueError, 'non-float argument to string.atof' |
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201 try: |
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202 return float(eval(sign + s)) |
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203 except SyntaxError: |
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204 raise ValueError, 'non-float argument to string.atof' |
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205 |
| 5 | 206 # Convert string to integer |
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207 def atoi(str, base=10): |
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208 if base != 10: |
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209 # We only get here if strop doesn't define atoi() |
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210 raise ValueError, "this string.atoi doesn't support base != 10" |
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211 sign = '' |
| 5 | 212 s = str |
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213 if s and s[0] in '+-': |
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214 sign = s[0] |
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215 s = s[1:] |
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216 if not s: |
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217 raise ValueError, 'non-integer argument to string.atoi' |
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218 while s[0] == '0' and len(s) > 1: s = s[1:] |
| 5 | 219 for c in s: |
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220 if c not in digits: |
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221 raise ValueError, 'non-integer argument to string.atoi' |
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222 return eval(sign + s) |
| 5 | 223 |
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224 # Convert string to long integer |
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225 def atol(str, base=10): |
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226 if base != 10: |
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227 # We only get here if strop doesn't define atol() |
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228 raise ValueError, "this string.atol doesn't support base != 10" |
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229 sign = '' |
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230 s = str |
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231 if s and s[0] in '+-': |
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232 sign = s[0] |
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233 s = s[1:] |
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234 if not s: |
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235 raise ValueError, 'non-integer argument to string.atol' |
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236 while s[0] == '0' and len(s) > 1: s = s[1:] |
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237 for c in s: |
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238 if c not in digits: |
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239 raise ValueError, 'non-integer argument to string.atol' |
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240 return eval(sign + s + 'L') |
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241 |
| 5 | 242 # Left-justify a string |
| 243 def ljust(s, width): | |
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244 n = width - len(s) |
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245 if n <= 0: return s |
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246 return s + ' '*n |
| 5 | 247 |
| 248 # Right-justify a string | |
| 249 def rjust(s, width): | |
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250 n = width - len(s) |
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251 if n <= 0: return s |
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252 return ' '*n + s |
| 5 | 253 |
| 254 # Center a string | |
| 255 def center(s, width): | |
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256 n = width - len(s) |
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257 if n <= 0: return s |
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258 half = n/2 |
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259 if n%2 and width%2: |
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260 # This ensures that center(center(s, i), j) = center(s, j) |
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261 half = half+1 |
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262 return ' '*half + s + ' '*(n-half) |
| 5 | 263 |
| 264 # Zero-fill a number, e.g., (12, 3) --> '012' and (-3, 3) --> '-03' | |
| 265 # Decadent feature: the argument may be a string or a number | |
| 266 # (Use of this is deprecated; it should be a string as with ljust c.s.) | |
| 267 def zfill(x, width): | |
| 559 | 268 if type(x) == type(''): s = x |
| 5 | 269 else: s = `x` |
| 270 n = len(s) | |
| 271 if n >= width: return s | |
| 272 sign = '' | |
| 365 | 273 if s[0] in ('-', '+'): |
| 274 sign, s = s[0], s[1:] | |
| 5 | 275 return sign + '0'*(width-n) + s |
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276 |
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277 # Expand tabs in a string. |
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278 # Doesn't take non-printing chars into account, but does understand \n. |
| 2958 | 279 def expandtabs(s, tabsize=8): |
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280 res = line = '' |
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281 for c in s: |
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282 if c == '\t': |
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283 c = ' '*(tabsize - len(line)%tabsize) |
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284 line = line + c |
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285 if c == '\n': |
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286 res = res + line |
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287 line = '' |
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288 return res + line |
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289 |
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290 # Character translation through look-up table. |
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291 def translate(s, table, deletions=""): |
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292 if type(table) != type('') or len(table) != 256: |
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293 raise TypeError, "translation table must be 256 characters long" |
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294 res = "" |
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295 for c in s: |
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296 if c not in deletions: |
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297 res = res + table[ord(c)] |
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298 return res |
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299 |
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300 # Capitalize a string, e.g. "aBc dEf" -> "Abc def". |
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301 def capitalize(s): |
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302 return upper(s[:1]) + lower(s[1:]) |
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303 |
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304 # Capitalize the words in a string, e.g. " aBc dEf " -> "Abc Def". |
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305 # See also regsub.capwords(). |
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306 def capwords(s, sep=None): |
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307 return join(map(capitalize, split(s, sep)), sep or ' ') |
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308 |
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309 # Construct a translation string |
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310 _idmapL = None |
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311 def maketrans(fromstr, tostr): |
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312 if len(fromstr) != len(tostr): |
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313 raise ValueError, "maketrans arguments must have same length" |
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314 global _idmapL |
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315 if not _idmapL: |
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316 _idmapL = map(None, _idmap) |
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317 L = _idmapL[:] |
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318 fromstr = map(ord, fromstr) |
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319 for i in range(len(fromstr)): |
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320 L[fromstr[i]] = tostr[i] |
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321 return joinfields(L, "") |
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322 |
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323 # Substring replacement (global) |
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324 def replace(str, old, new, maxsplit=0): |
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325 return joinfields(splitfields(str, old, maxsplit), new) |
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326 |
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327 |
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328 # Try importing optional built-in module "strop" -- if it exists, |
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329 # it redefines some string operations that are 100-1000 times faster. |
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330 # It also defines values for whitespace, lowercase and uppercase |
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331 # that match <ctype.h>'s definitions. |
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332 |
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333 try: |
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334 from strop import * |
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335 letters = lowercase + uppercase |
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336 except ImportError: |
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337 pass # Use the original, slow versions |