Mercurial > cpython-lru_cache-weakref

annotate Lib/macpath.py @ 27233:eebc4fdac594 2.2

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supports_unicode_filenames should not have been backported, test___all__ now passed
author Neal Norwitz <nnorwitz@gmail.com>
date Mon, 13 Jan 2003 19:29:38 +0000
parents 3b3ce964adc9
children 22551e1d2c6e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 "realpath"]
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11
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12 # Normalize the case of a pathname. Dummy in Posix, but <s>.lower() here.
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13
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14 def normcase(path):
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15 return path.lower()
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16
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18 def isabs(s):
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19 """Return true if a path is absolute.
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20 On the Mac, relative paths begin with a colon,
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21 but as a special case, paths with no colons at all are also relative.
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22 Anything else is absolute (the string up to the first colon is the
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23 volume name)."""
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25 return ':' in s and s[0] != ':'
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27
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28 def join(s, *p):
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29 path = s
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30 for t in p:
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31 if (not s) or isabs(t):
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32 path = t
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33 continue
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34 if t[:1] == ':':
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35 t = t[1:]
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36 if ':' not in path:
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37 path = ':' + path
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38 if path[-1:] != ':':
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39 path = path + ':'
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40 path = path + t
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41 return path
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43
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44 def split(s):
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45 """Split a pathname into two parts: the directory leading up to the final
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46 bit, and the basename (the filename, without colons, in that directory).
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47 The result (s, t) is such that join(s, t) yields the original argument."""
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48
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49 if ':' not in s: return '', s
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50 colon = 0
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51 for i in range(len(s)):
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52 if s[i] == ':': colon = i + 1
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53 path, file = s[:colon-1], s[colon:]
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54 if path and not ':' in path:
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55 path = path + ':'
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56 return path, file
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57
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58
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59 def splitext(p):
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60 """Split a path into root and extension.
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61 The extension is everything starting at the last dot in the last
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62 pathname component; the root is everything before that.
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63 It is always true that root + ext == p."""
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64
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65 root, ext = '', ''
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66 for c in p:
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67 if c == ':':
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68 root, ext = root + ext + c, ''
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69 elif c == '.':
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70 if ext:
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71 root, ext = root + ext, c
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72 else:
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73 ext = c
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74 elif ext:
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75 ext = ext + c
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76 else:
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77 root = root + c
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78 return root, ext
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81 def splitdrive(p):
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82 """Split a pathname into a drive specification and the rest of the
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83 path. Useful on DOS/Windows/NT; on the Mac, the drive is always
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84 empty (don't use the volume name -- it doesn't have the same
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85 syntactic and semantic oddities as DOS drive letters, such as there
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86 being a separate current directory per drive)."""
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87
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88 return '', p
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91 # Short interfaces to split()
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92
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93 def dirname(s): return split(s)[0]
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94 def basename(s): return split(s)[1]
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96
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97 def isdir(s):
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98 """Return true if the pathname refers to an existing directory."""
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100 try:
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101 st = os.stat(s)
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102 except os.error:
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103 return 0
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104 return S_ISDIR(st[ST_MODE])
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106
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107 # Get size, mtime, atime of files.
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108
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109 def getsize(filename):
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110 """Return the size of a file, reported by os.stat()."""
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111 st = os.stat(filename)
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112 return st[ST_SIZE]
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113
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114 def getmtime(filename):
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115 """Return the last modification time of a file, reported by os.stat()."""
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116 st = os.stat(filename)
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117 return st[ST_MTIME]
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118
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119 def getatime(filename):
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120 """Return the last access time of a file, reported by os.stat()."""
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121 st = os.stat(filename)
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122 return st[ST_ATIME]
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124
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125 def islink(s):
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126 """Return true if the pathname refers to a symbolic link.
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127 Always false on the Mac, until we understand Aliases.)"""
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128
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129 return 0
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130
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132 def isfile(s):
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133 """Return true if the pathname refers to an existing regular file."""
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134
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135 try:
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136 st = os.stat(s)
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137 except os.error:
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138 return 0
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139 return S_ISREG(st[ST_MODE])
103
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140
105
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141
103
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142 def exists(s):
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143 """Return true if the pathname refers to an existing file or directory."""
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144
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145 try:
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146 st = os.stat(s)
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147 except os.error:
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148 return 0
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149 return 1
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150
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151 # Return the longest prefix of all list elements.
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152
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153 def commonprefix(m):
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154 "Given a list of pathnames, returns the longest common leading component"
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155 if not m: return ''
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156 prefix = m[0]
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157 for item in m:
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158 for i in range(len(prefix)):
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159 if prefix[:i+1] != item[:i+1]:
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160 prefix = prefix[:i]
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161 if i == 0: return ''
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162 break
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163 return prefix
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164
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165 def expandvars(path):
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166 """Dummy to retain interface-compatibility with other operating systems."""
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167 return path
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168
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169
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170 def expanduser(path):
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171 """Dummy to retain interface-compatibility with other operating systems."""
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172 return path
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173
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174 norm_error = 'macpath.norm_error: path cannot be normalized'
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175
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176 def normpath(s):
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177 """Normalize a pathname. Will return the same result for
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178 equivalent paths."""
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179
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180 if ":" not in s:
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181 return ":"+s
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182
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183 comps = s.split(":")
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184 i = 1
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185 while i < len(comps)-1:
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186 if comps[i] == "" and comps[i-1] != "":
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187 if i > 1:
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188 del comps[i-1:i+1]
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189 i = i - 1
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190 else:
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191 # best way to handle this is to raise an exception
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192 raise norm_error, 'Cannot use :: immediately after volume name'
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193 else:
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194 i = i + 1
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195
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196 s = ":".join(comps)
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197
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198 # remove trailing ":" except for ":" and "Volume:"
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199 if s[-1] == ":" and len(comps) > 2 and s != ":"*len(s):
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200 s = s[:-1]
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201 return s
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202
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203
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204 def walk(top, func, arg):
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205 """Directory tree walk with callback function.
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206
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207 For each directory in the directory tree rooted at top (including top
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208 itself, but excluding '.' and '..'), call func(arg, dirname, fnames).
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209 dirname is the name of the directory, and fnames a list of the names of
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210 the files and subdirectories in dirname (excluding '.' and '..'). func
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211 may modify the fnames list in-place (e.g. via del or slice assignment),
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212 and walk will only recurse into the subdirectories whose names remain in
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213 fnames; this can be used to implement a filter, or to impose a specific
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214 order of visiting. No semantics are defined for, or required of, arg,
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215 beyond that arg is always passed to func. It can be used, e.g., to pass
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216 a filename pattern, or a mutable object designed to accumulate
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Tim Peters <tim.peters@gmail.com>
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217 statistics. Passing None for arg is common."""
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218
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219 try:
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220 names = os.listdir(top)
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221 except os.error:
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222 return
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223 func(arg, top, names)
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224 for name in names:
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225 name = join(top, name)
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226 if isdir(name):
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227 walk(name, func, arg)
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228
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229
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230 def abspath(path):
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231 """Return an absolute path."""
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232 if not isabs(path):
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233 path = join(os.getcwd(), path)
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234 return normpath(path)
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235
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236 # realpath is a no-op on systems without islink support
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237 realpath = abspath