Mercurial > cpython-lru_cache-weakref

annotate Lib/macpath.py @ 17581:c1937faabb23 2.1

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Added support for optional explanation parameter to the \versionadded macro. Refactored do_cmd_versionadded() and do_cmd_versionchanged() to do most of the work in a helper function, with the do_cmd_*() wrappers just supplying a portion of the replacement text.
author Fred Drake <fdrake@acm.org>
date Wed, 18 Apr 2001 17:29:14 +0000
parents 32755b456369
children 27b4dbd428fe
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1 """Pathname and path-related operations for the Macintosh."""
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2
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3 import os
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4 from stat import *
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5
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6 __all__ = ["normcase","isabs","join","splitdrive","split","splitext",
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7 "basename","dirname","commonprefix","getsize","getmtime",
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8 "getatime","islink","exists","isdir","isfile",
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9 "walk","expanduser","expandvars","normpath","abspath"]
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10
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11 # Normalize the case of a pathname. Dummy in Posix, but <s>.lower() here.
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12
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13 def normcase(path):
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14 return path.lower()
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15
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17 def isabs(s):
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18 """Return true if a path is absolute.
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19 On the Mac, relative paths begin with a colon,
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20 but as a special case, paths with no colons at all are also relative.
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21 Anything else is absolute (the string up to the first colon is the
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22 volume name)."""
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24 return ':' in s and s[0] != ':'
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26
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27 def join(s, *p):
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28 path = s
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29 for t in p:
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30 if (not s) or isabs(t):
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31 path = t
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32 continue
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33 if t[:1] == ':':
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34 t = t[1:]
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35 if ':' not in path:
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36 path = ':' + path
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37 if path[-1:] != ':':
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38 path = path + ':'
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39 path = path + t
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40 return path
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43 def split(s):
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44 """Split a pathname into two parts: the directory leading up to the final
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45 bit, and the basename (the filename, without colons, in that directory).
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46 The result (s, t) is such that join(s, t) yields the original argument."""
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47
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48 if ':' not in s: return '', s
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49 colon = 0
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50 for i in range(len(s)):
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51 if s[i] == ':': colon = i + 1
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52 path, file = s[:colon-1], s[colon:]
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53 if path and not ':' in path:
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54 path = path + ':'
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55 return path, file
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58 def splitext(p):
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59 """Split a path into root and extension.
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60 The extension is everything starting at the last dot in the last
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61 pathname component; the root is everything before that.
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62 It is always true that root + ext == p."""
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63
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64 root, ext = '', ''
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65 for c in p:
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66 if c == ':':
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67 root, ext = root + ext + c, ''
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68 elif c == '.':
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69 if ext:
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70 root, ext = root + ext, c
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71 else:
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72 ext = c
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73 elif ext:
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74 ext = ext + c
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75 else:
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76 root = root + c
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77 return root, ext
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80 def splitdrive(p):
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81 """Split a pathname into a drive specification and the rest of the
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82 path. Useful on DOS/Windows/NT; on the Mac, the drive is always
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83 empty (don't use the volume name -- it doesn't have the same
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84 syntactic and semantic oddities as DOS drive letters, such as there
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85 being a separate current directory per drive)."""
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86
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87 return '', p
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89
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90 # Short interfaces to split()
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91
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92 def dirname(s): return split(s)[0]
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93 def basename(s): return split(s)[1]
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96 def isdir(s):
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97 """Return true if the pathname refers to an existing directory."""
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99 try:
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100 st = os.stat(s)
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101 except os.error:
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102 return 0
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103 return S_ISDIR(st[ST_MODE])
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105
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106 # Get size, mtime, atime of files.
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107
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108 def getsize(filename):
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109 """Return the size of a file, reported by os.stat()."""
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110 st = os.stat(filename)
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111 return st[ST_SIZE]
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112
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113 def getmtime(filename):
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114 """Return the last modification time of a file, reported by os.stat()."""
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115 st = os.stat(filename)
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116 return st[ST_MTIME]
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117
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118 def getatime(filename):
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119 """Return the last access time of a file, reported by os.stat()."""
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120 st = os.stat(filename)
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121 return st[ST_ATIME]
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123
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124 def islink(s):
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125 """Return true if the pathname refers to a symbolic link.
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126 Always false on the Mac, until we understand Aliases.)"""
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127
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128 return 0
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129
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131 def isfile(s):
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132 """Return true if the pathname refers to an existing regular file."""
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133
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134 try:
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135 st = os.stat(s)
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136 except os.error:
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137 return 0
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138 return S_ISREG(st[ST_MODE])
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139
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140
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141 def exists(s):
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142 """Return true if the pathname refers to an existing file or directory."""
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143
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144 try:
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145 st = os.stat(s)
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146 except os.error:
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147 return 0
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148 return 1
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149
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150 # Return the longest prefix of all list elements.
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151
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152 def commonprefix(m):
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153 "Given a list of pathnames, returns the longest common leading component"
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154 if not m: return ''
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155 prefix = m[0]
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156 for item in m:
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157 for i in range(len(prefix)):
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158 if prefix[:i+1] != item[:i+1]:
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159 prefix = prefix[:i]
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160 if i == 0: return ''
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161 break
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162 return prefix
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163
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164 def expandvars(path):
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165 """Dummy to retain interface-compatibility with other operating systems."""
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166 return path
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167
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168
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169 def expanduser(path):
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170 """Dummy to retain interface-compatibility with other operating systems."""
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171 return path
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172
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173 norm_error = 'macpath.norm_error: path cannot be normalized'
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174
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175 def normpath(s):
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176 """Normalize a pathname. Will return the same result for
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177 equivalent paths."""
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178
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179 if ":" not in s:
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180 return ":"+s
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181
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182 comps = s.split(":")
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183 i = 1
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184 while i < len(comps)-1:
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185 if comps[i] == "" and comps[i-1] != "":
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186 if i > 1:
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187 del comps[i-1:i+1]
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188 i = i - 1
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189 else:
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190 # best way to handle this is to raise an exception
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191 raise norm_error, 'Cannot use :: immedeately after volume name'
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192 else:
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193 i = i + 1
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194
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195 s = ":".join(comps)
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196
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197 # remove trailing ":" except for ":" and "Volume:"
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198 if s[-1] == ":" and len(comps) > 2 and s != ":"*len(s):
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199 s = s[:-1]
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200 return s
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201
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202
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203 def walk(top, func, arg):
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204 """Directory tree walk.
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205 For each directory under top (including top itself),
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206 func(arg, dirname, filenames) is called, where
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207 dirname is the name of the directory and filenames is the list
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208 of files (and subdirectories etc.) in the directory.
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209 The func may modify the filenames list, to implement a filter,
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210 or to impose a different order of visiting."""
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211
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212 try:
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213 names = os.listdir(top)
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214 except os.error:
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215 return
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216 func(arg, top, names)
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217 for name in names:
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218 name = join(top, name)
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219 if isdir(name):
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220 walk(name, func, arg)
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221
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222
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223 def abspath(path):
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224 """Return an absolute path."""
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225 if not isabs(path):
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226 path = join(os.getcwd(), path)
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227 return normpath(path)