Mercurial > cpython-lru_cache-weakref

annotate Lib/string.py @ 6719:faebc1940432 legacy-trunk

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author Guido van Rossum <guido@python.org>
date Tue, 02 Dec 1997 20:38:11 +0000
parents d790fe25e148
children 8ef481c7c3af
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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.
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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".
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6
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7 # Some strings for ctype-style character classification
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8 whitespace = ' \t\n\r\v\f'
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9 lowercase = 'abcdefghijklmnopqrstuvwxyz'
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10 uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
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11 letters = lowercase + uppercase
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12 digits = '0123456789'
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13 hexdigits = digits + 'abcdef' + 'ABCDEF'
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14 octdigits = '01234567'
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15
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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:]
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22 del i
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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
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30 # convert UPPER CASE letters to lower case
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31 def lower(s):
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32 res = ''
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33 for c in s:
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34 res = res + _lower[ord(c)]
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35 return res
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36
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37 # Convert lower case letters to UPPER CASE
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38 def upper(s):
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39 res = ''
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40 for c in s:
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41 res = res + _upper[ord(c)]
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42 return res
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43
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44 # Swap lower case letters and UPPER CASE
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45 def swapcase(s):
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46 res = ''
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47 for c in s:
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48 res = res + _swapcase[ord(c)]
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49 return res
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50
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51 # Strip leading and trailing tabs and spaces
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52 def strip(s):
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53 i, j = 0, len(s)
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54 while i < j and s[i] in whitespace: i = i+1
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55 while i < j and s[j-1] in whitespace: j = j-1
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56 return s[i:j]
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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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71 # Split a string into a list of space/tab-separated words
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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)
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75 res = []
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76 i, n = 0, len(s)
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77 if maxsplit <= 0: maxsplit = n
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78 count = 0
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79 while i < n:
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80 while i < n and s[i] in whitespace: i = i+1
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81 if i == n: break
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82 if count >= maxsplit:
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83 res.append(s[i:])
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84 break
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85 j = i
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86 while j < n and s[j] not in whitespace: j = j+1
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87 count = count + 1
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88 res.append(s[i:j])
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89 i = j
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90 return res
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91
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92 # Split a list into fields separated by a given string
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93 # NB: splitfields(s, ' ') is NOT the same as split(s)!
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94 # splitfields(s, '') returns [s] (in analogy with split() in nawk)
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95 def splitfields(s, sep=None, maxsplit=0):
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96 if sep is None: return split(s, None, maxsplit)
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97 res = []
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98 nsep = len(sep)
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99 if nsep == 0:
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100 return [s]
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101 ns = len(s)
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102 if maxsplit <= 0: maxsplit = ns
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103 i = j = 0
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104 count = 0
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105 while j+nsep <= ns:
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106 if s[j:j+nsep] == sep:
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107 count = count + 1
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108 res.append(s[i:j])
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109 i = j = j + nsep
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110 if count >= maxsplit: break
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111
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112 else:
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113 j = j + 1
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114 res.append(s[i:])
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115 return res
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116
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117 # Join words with spaces between them
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118 def join(words, sep = ' '):
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119 return joinfields(words, sep)
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120
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121 # Join fields with optional separator
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122 def joinfields(words, sep = ' '):
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123 res = ''
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124 for w in words:
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125 res = res + (sep + w)
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126 return res[len(sep):]
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127
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128 # Find substring, raise exception if not found
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129 def index(s, sub, i = 0, last=None):
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130 if last is None: last = len(s)
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131 res = find(s, sub, i, last)
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132 if res < 0:
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133 raise ValueError, 'substring not found in string.index'
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134 return res
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135
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136 # Find last substring, raise exception if not found
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137 def rindex(s, sub, i = 0, last=None):
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138 if last is None: last = len(s)
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139 res = rfind(s, sub, i, last)
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140 if res < 0:
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141 raise ValueError, 'substring not found in string.index'
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142 return res
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143
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144 # Count non-overlapping occurrences of substring
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145 def count(s, sub, i = 0, last=None):
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146 Slen = len(s) # cache this value, for speed
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147 if last is None:
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148 last = Slen
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149 elif last < 0:
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150 last = max(0, last + Slen)
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151 elif last > Slen:
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152 last = Slen
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153 if i < 0: i = max(0, i + Slen)
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154 n = len(sub)
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155 m = last + 1 - n
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156 if n == 0: return m-i
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157 r = 0
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158 while i < m:
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159 if sub == s[i:i+n]:
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160 r = r+1
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161 i = i+n
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162 else:
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163 i = i+1
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164 return r
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165
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166 # Find substring, return -1 if not found
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167 def find(s, sub, i = 0, last=None):
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168 Slen = len(s) # cache this value, for speed
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169 if last is None:
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170 last = Slen
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171 elif last < 0:
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172 last = max(0, last + Slen)
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173 elif last > Slen:
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174 last = Slen
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175 if i < 0: i = max(0, i + Slen)
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176 n = len(sub)
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177 m = last + 1 - n
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178 while i < m:
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179 if sub == s[i:i+n]: return i
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180 i = i+1
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181 return -1
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182
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183 # Find last substring, return -1 if not found
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184 def rfind(s, sub, i = 0, last=None):
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185 Slen = len(s) # cache this value, for speed
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186 if last is None:
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187 last = Slen
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188 elif last < 0:
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189 last = max(0, last + Slen)
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190 elif last > Slen:
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191 last = Slen
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192 if i < 0: i = max(0, i + Slen)
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193 n = len(sub)
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194 m = last + 1 - n
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195 r = -1
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196 while i < m:
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197 if sub == s[i:i+n]: r = i
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198 i = i+1
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199 return r
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200
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201 # Convert string to float
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202 re = None
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203 def atof(str):
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204 global re
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205 if re is None:
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206 import re
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207 sign = ''
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208 s = strip(str)
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209 if s and s[0] in '+-':
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210 sign = s[0]
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211 s = s[1:]
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212 if not s:
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213 raise ValueError, 'non-float argument to string.atof'
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214 while s[0] == '0' and len(s) > 1 and s[1] in digits: s = s[1:]
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215 if not re.match('[0-9]*(\.[0-9]*)?([eE][-+]?[0-9]+)?$', s):
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216 raise ValueError, 'non-float argument to string.atof'
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217 try:
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218 return float(eval(sign + s))
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219 except SyntaxError:
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220 raise ValueError, 'non-float argument to string.atof'
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221
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222 # Convert string to integer
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223 def atoi(str, base=10):
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224 if base != 10:
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225 # We only get here if strop doesn't define atoi()
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226 raise ValueError, "this string.atoi doesn't support base != 10"
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227 sign = ''
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228 s = str
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229 if s and s[0] in '+-':
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230 sign = s[0]
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231 s = s[1:]
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232 if not s:
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233 raise ValueError, 'non-integer argument to string.atoi'
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234 while s[0] == '0' and len(s) > 1: s = s[1:]
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235 for c in s:
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236 if c not in digits:
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237 raise ValueError, 'non-integer argument to string.atoi'
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238 return eval(sign + s)
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239
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240 # Convert string to long integer
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241 def atol(str, base=10):
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242 if base != 10:
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243 # We only get here if strop doesn't define atol()
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244 raise ValueError, "this string.atol doesn't support base != 10"
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245 sign = ''
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246 s = str
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247 if s and s[0] in '+-':
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248 sign = s[0]
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249 s = s[1:]
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250 if not s:
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251 raise ValueError, 'non-integer argument to string.atol'
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252 while s[0] == '0' and len(s) > 1: s = s[1:]
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253 for c in s:
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254 if c not in digits:
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255 raise ValueError, 'non-integer argument to string.atol'
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256 return eval(sign + s + 'L')
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257
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258 # Left-justify a string
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259 def ljust(s, width):
196
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260 n = width - len(s)
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261 if n <= 0: return s
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262 return s + ' '*n
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263
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264 # Right-justify a string
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265 def rjust(s, width):
196
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266 n = width - len(s)
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267 if n <= 0: return s
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268 return ' '*n + s
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269
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270 # Center a string
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271 def center(s, width):
196
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272 n = width - len(s)
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273 if n <= 0: return s
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274 half = n/2
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275 if n%2 and width%2:
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276 # This ensures that center(center(s, i), j) = center(s, j)
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277 half = half+1
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278 return ' '*half + s + ' '*(n-half)
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279
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280 # Zero-fill a number, e.g., (12, 3) --> '012' and (-3, 3) --> '-03'
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281 # Decadent feature: the argument may be a string or a number
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282 # (Use of this is deprecated; it should be a string as with ljust c.s.)
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283 def zfill(x, width):
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284 if type(x) == type(''): s = x
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285 else: s = `x`
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286 n = len(s)
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287 if n >= width: return s
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288 sign = ''
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289 if s[0] in ('-', '+'):
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290 sign, s = s[0], s[1:]
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291 return sign + '0'*(width-n) + s
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292
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293 # Expand tabs in a string.
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294 # Doesn't take non-printing chars into account, but does understand \n.
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295 def expandtabs(s, tabsize=8):
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296 res = line = ''
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297 for c in s:
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298 if c == '\t':
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299 c = ' '*(tabsize - len(line)%tabsize)
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300 line = line + c
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301 if c == '\n':
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302 res = res + line
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303 line = ''
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304 return res + line
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305
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306 # Character translation through look-up table.
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307 def translate(s, table, deletions=""):
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308 if type(table) != type('') or len(table) != 256:
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309 raise TypeError, "translation table must be 256 characters long"
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310 res = ""
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311 for c in s:
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312 if c not in deletions:
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313 res = res + table[ord(c)]
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314 return res
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315
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316 # Capitalize a string, e.g. "aBc dEf" -> "Abc def".
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317 def capitalize(s):
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318 return upper(s[:1]) + lower(s[1:])
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319
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320 # Capitalize the words in a string, e.g. " aBc dEf " -> "Abc Def".
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321 # See also regsub.capwords().
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322 def capwords(s, sep=None):
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323 return join(map(capitalize, split(s, sep)), sep or ' ')
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324
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325 # Construct a translation string
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326 _idmapL = None
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327 def maketrans(fromstr, tostr):
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328 if len(fromstr) != len(tostr):
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329 raise ValueError, "maketrans arguments must have same length"
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330 global _idmapL
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331 if not _idmapL:
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332 _idmapL = map(None, _idmap)
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333 L = _idmapL[:]
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334 fromstr = map(ord, fromstr)
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335 for i in range(len(fromstr)):
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336 L[fromstr[i]] = tostr[i]
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337 return joinfields(L, "")
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338
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339 # Substring replacement (global)
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340 def replace(str, old, new, maxsplit=0):
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341 return joinfields(splitfields(str, old, maxsplit), new)
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342
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343
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344 # Try importing optional built-in module "strop" -- if it exists,
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345 # it redefines some string operations that are 100-1000 times faster.
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346 # It also defines values for whitespace, lowercase and uppercase
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347 # that match <ctype.h>'s definitions.
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348
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349 try:
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350 from strop import *
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351 letters = lowercase + uppercase
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352 except ImportError:
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353 pass # Use the original, slow versions