Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/classfix.py @ 49955:878d40468c4e legacy-trunk

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Issue #4384: Added logging integration with warnings module using captureWarnings(). This change includes a NullHandler which does nothing; it will be of use to library developers who want to avoid the "No handlers could be found for logger XXX" message which can appear if the library user doesn't configure logging.
author Vinay Sajip <vinay_sajip@yahoo.co.uk>
date Wed, 03 Dec 2008 23:22:58 +0000
parents 4727f260f6f8
children 6b18a095c2e7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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73758db2f464 /usr/local/bin/python -> /usr/bin/env python
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1 #! /usr/bin/env python
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2
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3 # This script is obsolete -- it is kept for historical purposes only.
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4 #
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5 # Fix Python source files to use the new class definition syntax, i.e.,
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6 # the syntax used in Python versions before 0.9.8:
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7 # class C() = base(), base(), ...: ...
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8 # is changed to the current syntax:
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9 # class C(base, base, ...): ...
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10 #
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11 # The script uses heuristics to find class definitions that usually
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12 # work but occasionally can fail; carefully check the output!
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13 #
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14 # Command line arguments are files or directories to be processed.
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15 # Directories are searched recursively for files whose name looks
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16 # like a python module.
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17 # Symbolic links are always ignored (except as explicit directory
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18 # arguments). Of course, the original file is kept as a back-up
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19 # (with a "~" attached to its name).
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20 #
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21 # Changes made are reported to stdout in a diff-like format.
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22 #
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23 # Undoubtedly you can do this using find and sed or perl, but this is
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24 # a nice example of Python code that recurses down a directory tree
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25 # and uses regular expressions. Also note several subtleties like
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26 # preserving the file's mode and avoiding to even write a temp file
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27 # when no changes are needed for a file.
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28 #
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29 # NB: by changing only the function fixline() you can turn this
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30 # into a program for a different change to Python programs...
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31
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32 import sys
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33 import re
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34 import os
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35 from stat import *
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36
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37 err = sys.stderr.write
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38 dbg = err
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39 rep = sys.stdout.write
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40
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41 def main():
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42 bad = 0
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43 if not sys.argv[1:]: # No arguments
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44 err('usage: ' + sys.argv[0] + ' file-or-directory ...\n')
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45 sys.exit(2)
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46 for arg in sys.argv[1:]:
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47 if os.path.isdir(arg):
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48 if recursedown(arg): bad = 1
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49 elif os.path.islink(arg):
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50 err(arg + ': will not process symbolic links\n')
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51 bad = 1
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52 else:
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53 if fix(arg): bad = 1
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54 sys.exit(bad)
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55
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56 ispythonprog = re.compile('^[a-zA-Z0-9_]+\.py$')
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57 def ispython(name):
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58 return ispythonprog.match(name) >= 0
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59
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60 def recursedown(dirname):
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61 dbg('recursedown(%r)\n' % (dirname,))
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62 bad = 0
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63 try:
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64 names = os.listdir(dirname)
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65 except os.error, msg:
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66 err('%s: cannot list directory: %r\n' % (dirname, msg))
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67 return 1
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68 names.sort()
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69 subdirs = []
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70 for name in names:
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71 if name in (os.curdir, os.pardir): continue
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72 fullname = os.path.join(dirname, name)
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73 if os.path.islink(fullname): pass
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74 elif os.path.isdir(fullname):
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75 subdirs.append(fullname)
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76 elif ispython(name):
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77 if fix(fullname): bad = 1
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78 for fullname in subdirs:
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79 if recursedown(fullname): bad = 1
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80 return bad
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81
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82 def fix(filename):
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83 ## dbg('fix(%r)\n' % (filename,))
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84 try:
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85 f = open(filename, 'r')
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86 except IOError, msg:
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87 err('%s: cannot open: %r\n' % (filename, msg))
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88 return 1
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89 head, tail = os.path.split(filename)
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90 tempname = os.path.join(head, '@' + tail)
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91 g = None
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92 # If we find a match, we rewind the file and start over but
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93 # now copy everything to a temp file.
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94 lineno = 0
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95 while 1:
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96 line = f.readline()
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97 if not line: break
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98 lineno = lineno + 1
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99 while line[-2:] == '\\\n':
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100 nextline = f.readline()
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101 if not nextline: break
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102 line = line + nextline
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103 lineno = lineno + 1
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104 newline = fixline(line)
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105 if newline != line:
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106 if g is None:
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107 try:
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108 g = open(tempname, 'w')
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109 except IOError, msg:
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110 f.close()
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111 err('%s: cannot create: %r\n' % (tempname, msg))
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112 return 1
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113 f.seek(0)
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114 lineno = 0
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115 rep(filename + ':\n')
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116 continue # restart from the beginning
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117 rep(repr(lineno) + '\n')
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118 rep('< ' + line)
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119 rep('> ' + newline)
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120 if g is not None:
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121 g.write(newline)
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122
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123 # End of file
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124 f.close()
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125 if not g: return 0 # No changes
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126
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127 # Finishing touch -- move files
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128
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129 # First copy the file's mode to the temp file
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130 try:
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131 statbuf = os.stat(filename)
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132 os.chmod(tempname, statbuf[ST_MODE] & 07777)
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133 except os.error, msg:
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134 err('%s: warning: chmod failed (%r)\n' % (tempname, msg))
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135 # Then make a backup of the original file as filename~
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136 try:
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137 os.rename(filename, filename + '~')
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138 except os.error, msg:
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139 err('%s: warning: backup failed (%r)\n' % (filename, msg))
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140 # Now move the temp file to the original file
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141 try:
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142 os.rename(tempname, filename)
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143 except os.error, msg:
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144 err('%s: rename failed (%r)\n' % (filename, msg))
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145 return 1
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146 # Return succes
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147 return 0
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148
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149 # This expression doesn't catch *all* class definition headers,
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150 # but it's pretty darn close.
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151 classexpr = '^([ \t]*class +[a-zA-Z0-9_]+) *( *) *((=.*)?):'
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152 classprog = re.compile(classexpr)
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153
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154 # Expressions for finding base class expressions.
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155 baseexpr = '^ *(.*) *( *) *$'
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156 baseprog = re.compile(baseexpr)
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157
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158 def fixline(line):
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159 if classprog.match(line) < 0: # No 'class' keyword -- no change
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160 return line
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161
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162 (a0, b0), (a1, b1), (a2, b2) = classprog.regs[:3]
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163 # a0, b0 = Whole match (up to ':')
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164 # a1, b1 = First subexpression (up to classname)
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165 # a2, b2 = Second subexpression (=.*)
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166 head = line[:b1]
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167 tail = line[b0:] # Unmatched rest of line
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168
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169 if a2 == b2: # No base classes -- easy case
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170 return head + ':' + tail
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171
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172 # Get rid of leading '='
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Tim Peters <tim.peters@gmail.com>
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173 basepart = line[a2+1:b2]
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174
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175 # Extract list of base expressions
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Walter Dörwald <walter@livinglogic.de>
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176 bases = basepart.split(',')
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177
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178 # Strip trailing '()' from each base expression
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179 for i in range(len(bases)):
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180 if baseprog.match(bases[i]) >= 0:
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181 x1, y1 = baseprog.regs[1]
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182 bases[i] = bases[i][x1:y1]
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183
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184 # Join the bases back again and build the new line
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Walter Dörwald <walter@livinglogic.de>
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185 basepart = ', '.join(bases)
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186
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187 return head + '(' + basepart + '):' + tail
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Guido van Rossum <guido@python.org>
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188
33074
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Andrew M. Kuchling <amk@amk.ca>
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189 if __name__ == '__main__':
981fff7363b9 [Patch #1005491 ] use __name__ == '__main__' in scripts
Andrew M. Kuchling <amk@amk.ca>
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190 main()