Mercurial > cpython-lru_cache-weakref
annotate Lib/string.py @ 1590:ac2e5cc29949 legacy-trunk
Added tests for missing host to open_http and open_gopher
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Mon, 18 Apr 1994 09:39:56 +0000 |
| parents | 6278933d02e3 |
| children | 1940892d2fe3 |
| 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 | |
| 24 # convert UPPER CASE letters to lower case | |
| 25 def lower(s): | |
| 26 res = '' | |
| 27 for c in s: | |
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28 res = res + _lower[ord(c)] |
| 5 | 29 return res |
| 30 | |
| 31 # Convert lower case letters to UPPER CASE | |
| 32 def upper(s): | |
| 33 res = '' | |
| 34 for c in s: | |
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35 res = res + _upper[ord(c)] |
| 5 | 36 return res |
| 37 | |
| 38 # Swap lower case letters and UPPER CASE | |
| 39 def swapcase(s): | |
| 40 res = '' | |
| 41 for c in s: | |
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42 res = res + _swapcase[ord(c)] |
| 5 | 43 return res |
| 44 | |
| 45 # Strip leading and trailing tabs and spaces | |
| 46 def strip(s): | |
| 47 i, j = 0, len(s) | |
| 48 while i < j and s[i] in whitespace: i = i+1 | |
| 49 while i < j and s[j-1] in whitespace: j = j-1 | |
| 50 return s[i:j] | |
| 51 | |
| 52 # Split a string into a list of space/tab-separated words | |
| 53 # NB: split(s) is NOT the same as splitfields(s, ' ')! | |
| 54 def split(s): | |
| 55 res = [] | |
| 56 i, n = 0, len(s) | |
| 57 while i < n: | |
| 58 while i < n and s[i] in whitespace: i = i+1 | |
| 559 | 59 if i == n: break |
| 5 | 60 j = i |
| 61 while j < n and s[j] not in whitespace: j = j+1 | |
| 62 res.append(s[i:j]) | |
| 63 i = j | |
| 64 return res | |
| 65 | |
| 66 # Split a list into fields separated by a given string | |
| 67 # NB: splitfields(s, ' ') is NOT the same as split(s)! | |
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68 # splitfields(s, '') returns [s] (in analogy with split() in nawk) |
| 5 | 69 def splitfields(s, sep): |
| 70 res = [] | |
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71 nsep = len(sep) |
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72 if nsep == 0: |
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73 return [s] |
| 5 | 74 ns = len(s) |
| 75 i = j = 0 | |
| 76 while j+nsep <= ns: | |
| 559 | 77 if s[j:j+nsep] == sep: |
| 5 | 78 res.append(s[i:j]) |
| 79 i = j = j + nsep | |
| 80 else: | |
| 81 j = j + 1 | |
| 82 res.append(s[i:]) | |
| 83 return res | |
| 84 | |
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85 # Join words with spaces between them |
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86 def join(words): |
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87 return joinfields(words, ' ') |
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88 |
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89 # Join fields with separator |
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90 def joinfields(words, sep): |
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91 res = '' |
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92 for w in words: |
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93 res = res + (sep + w) |
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94 return res[len(sep):] |
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95 |
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96 # Find substring, raise exception if not found |
| 5 | 97 index_error = 'substring not found in string.index' |
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98 def index(s, sub, *args): |
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99 if args: |
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100 if len(args) > 1: |
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101 raise TypeError, 'string.index(): too many args' |
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102 i = args[0] |
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103 if i < 0: i = i + len(s) |
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104 else: |
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105 i = 0 |
| 5 | 106 n = len(sub) |
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107 m = len(s) + 1 - n |
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108 while i < m: |
| 559 | 109 if sub == s[i:i+n]: return i |
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110 i = i+1 |
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111 raise index_error, (s, sub) + args |
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112 |
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113 # Find last substring, raise exception if not found |
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114 def rindex(s, sub, *args): |
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115 if args: |
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116 if len(args) > 1: |
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117 raise TypeError, 'string.rindex(): too many args' |
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118 i = args[0] |
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119 if i < 0: i = i + len(s) |
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120 else: |
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121 i = 0 |
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122 n = len(sub) |
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123 m = len(s) + 1 - n |
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124 r = None |
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125 while i < m: |
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126 if sub == s[i:i+n]: r = i |
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127 i = i+1 |
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128 if r is None: |
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129 raise index_error, (s, sub) + args |
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130 return r |
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131 |
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132 # Find substring, return -1 if not found |
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133 def find(*args): |
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134 try: |
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135 return apply(index, args) |
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136 except index_error: |
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137 return -1 |
| 5 | 138 |
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139 # Find last substring, return -1 if not found |
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140 def rfind(*args): |
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141 try: |
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142 return apply(rindex, args) |
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143 except index_error: |
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144 return -1 |
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145 |
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146 # Convert string to float |
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147 atof_error = 'non-float argument to string.atof' |
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148 def atof(str): |
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149 import regex |
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150 sign = '' |
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151 s = str |
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152 if s and s[0] in '+-': |
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153 sign = s[0] |
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154 s = s[1:] |
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155 if not s: raise atof_error, str |
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156 while s[0] == '0' and len(s) > 1 and s[1] in digits: s = s[1:] |
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157 if regex.match('[0-9]*\(\.[0-9]*\)?\([eE][-+]?[0-9]+\)?', s) != len(s): |
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158 raise atof_error, str |
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159 try: |
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160 return eval(sign + s) |
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161 except SyntaxError: |
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162 raise atof_error, str |
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163 |
| 5 | 164 # Convert string to integer |
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165 atoi_error = 'non-integer argument to string.atoi' |
| 5 | 166 def atoi(str): |
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167 sign = '' |
| 5 | 168 s = str |
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169 if s and s[0] in '+-': |
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170 sign = s[0] |
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171 s = s[1:] |
| 5 | 172 if not s: raise atoi_error, str |
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173 while s[0] == '0' and len(s) > 1: s = s[1:] |
| 5 | 174 for c in s: |
| 175 if c not in digits: raise atoi_error, str | |
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176 return eval(sign + s) |
| 5 | 177 |
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178 # Convert string to long integer |
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179 atol_error = 'non-integer argument to string.atol' |
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180 def atol(str): |
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181 sign = '' |
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182 s = str |
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183 if s and s[0] in '+-': |
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184 sign = s[0] |
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185 s = s[1:] |
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186 if not s: raise atoi_error, str |
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187 while s[0] == '0' and len(s) > 1: s = s[1:] |
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188 for c in s: |
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189 if c not in digits: raise atoi_error, str |
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190 return eval(sign + s + 'L') |
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191 |
| 5 | 192 # Left-justify a string |
| 193 def ljust(s, width): | |
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194 n = width - len(s) |
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195 if n <= 0: return s |
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196 return s + ' '*n |
| 5 | 197 |
| 198 # Right-justify a string | |
| 199 def rjust(s, width): | |
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200 n = width - len(s) |
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201 if n <= 0: return s |
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202 return ' '*n + s |
| 5 | 203 |
| 204 # Center a string | |
| 205 def center(s, width): | |
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206 n = width - len(s) |
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207 if n <= 0: return s |
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208 half = n/2 |
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209 if n%2 and width%2: |
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210 # This ensures that center(center(s, i), j) = center(s, j) |
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211 half = half+1 |
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212 return ' '*half + s + ' '*(n-half) |
| 5 | 213 |
| 214 # Zero-fill a number, e.g., (12, 3) --> '012' and (-3, 3) --> '-03' | |
| 215 # Decadent feature: the argument may be a string or a number | |
| 216 # (Use of this is deprecated; it should be a string as with ljust c.s.) | |
| 217 def zfill(x, width): | |
| 559 | 218 if type(x) == type(''): s = x |
| 5 | 219 else: s = `x` |
| 220 n = len(s) | |
| 221 if n >= width: return s | |
| 222 sign = '' | |
| 365 | 223 if s[0] in ('-', '+'): |
| 224 sign, s = s[0], s[1:] | |
| 5 | 225 return sign + '0'*(width-n) + s |
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226 |
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227 # Expand tabs in a string. |
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228 # Doesn't take non-printing chars into account, but does understand \n. |
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229 def expandtabs(s, tabsize): |
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230 res = line = '' |
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231 for c in s: |
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232 if c == '\t': |
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233 c = ' '*(tabsize - len(line)%tabsize) |
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234 line = line + c |
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235 if c == '\n': |
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236 res = res + line |
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237 line = '' |
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238 return res + line |
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239 |
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240 |
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241 # Try importing optional built-in module "strop" -- if it exists, |
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242 # it redefines some string operations that are 100-1000 times faster. |
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243 # It also defines values for whitespace, lowercase and uppercase |
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244 # that match <ctype.h>'s definitions. |
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245 # The manipulation with index_error is needed for compatibility. |
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246 |
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247 try: |
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248 from strop import * |
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249 letters = lowercase + uppercase |
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250 from strop import index |
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251 index_error = ValueError |
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252 except ImportError: |
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253 pass # Use the original, slow versions |