Mercurial > cpython-lru_cache-weakref

annotate Lib/macpath.py @ 13163:a09e8635534d legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Don't try to guess the name of a .def file -- if one is supplied, use it, otherwise just generate an '/export:' option.
author Greg Ward <gward@python.net>
date Thu, 29 Jun 2000 23:09:20 +0000
parents b6f52c1ef6da
children f119c2d8d560
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 string
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4 import os
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5 from stat import *
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6
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7
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8 # Normalize the case of a pathname. Dummy in Posix, but string.lower here.
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9
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10 normcase = string.lower
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11
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12
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13 def isabs(s):
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14 """Return true if a path is absolute.
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15 On the Mac, relative paths begin with a colon,
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16 but as a special case, paths with no colons at all are also relative.
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17 Anything else is absolute (the string up to the first colon is the
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18 volume name)."""
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20 return ':' in s and s[0] <> ':'
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22
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23 def join(s, *p):
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24 path = s
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25 for t in p:
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26 if (not s) or isabs(t):
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27 path = t
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28 continue
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29 if t[:1] == ':':
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30 t = t[1:]
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31 if ':' not in path:
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32 path = ':' + path
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33 if path[-1:] <> ':':
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34 path = path + ':'
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35 path = path + t
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36 return path
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38
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39 def split(s):
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40 """Split a pathname into two parts: the directory leading up to the final
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41 bit, and the basename (the filename, without colons, in that directory).
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42 The result (s, t) is such that join(s, t) yields the original argument."""
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43
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44 if ':' not in s: return '', s
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45 colon = 0
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46 for i in range(len(s)):
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47 if s[i] == ':': colon = i+1
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48 path, file = s[:colon-1], s[colon:]
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49 if path and not ':' in path:
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50 path = path + ':'
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51 return path, file
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54 def splitext(p):
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55 """Split a path into root and extension.
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56 The extension is everything starting at the last dot in the last
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57 pathname component; the root is everything before that.
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58 It is always true that root + ext == p."""
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59
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60 root, ext = '', ''
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61 for c in p:
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62 if c == ':':
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63 root, ext = root + ext + c, ''
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64 elif c == '.':
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65 if ext:
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66 root, ext = root + ext, c
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67 else:
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68 ext = c
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69 elif ext:
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70 ext = ext + c
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71 else:
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72 root = root + c
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73 return root, ext
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76 def splitdrive(p):
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77 """Split a pathname into a drive specification and the rest of the
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78 path. Useful on DOS/Windows/NT; on the Mac, the drive is always
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79 empty (don't use the volume name -- it doesn't have the same
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80 syntactic and semantic oddities as DOS drive letters, such as there
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81 being a separate current directory per drive)."""
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82
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83 return '', p
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85
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86 # Short interfaces to split()
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87
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88 def dirname(s): return split(s)[0]
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89 def basename(s): return split(s)[1]
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92 def isdir(s):
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93 """Return true if the pathname refers to an existing directory."""
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94
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95 try:
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96 st = os.stat(s)
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97 except os.error:
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98 return 0
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99 return S_ISDIR(st[ST_MODE])
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101
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102 # Get size, mtime, atime of files.
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103
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104 def getsize(filename):
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105 """Return the size of a file, reported by os.stat()."""
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106 st = os.stat(filename)
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107 return st[ST_SIZE]
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108
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109 def getmtime(filename):
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110 """Return the last modification time of a file, reported by os.stat()."""
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111 st = os.stat(filename)
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112 return st[ST_MTIME]
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113
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114 def getatime(filename):
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115 """Return the last access 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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119
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120 def islink(s):
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121 """Return true if the pathname refers to a symbolic link.
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122 Always false on the Mac, until we understand Aliases.)"""
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123
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124 return 0
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125
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126
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127 def isfile(s):
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128 """Return true if the pathname refers to an existing regular file."""
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129
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130 try:
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131 st = os.stat(s)
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132 except os.error:
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133 return 0
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134 return S_ISREG(st[ST_MODE])
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135
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136
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137 def exists(s):
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138 """Return true if the pathname refers to an existing file or directory."""
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139
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140 try:
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141 st = os.stat(s)
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142 except os.error:
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143 return 0
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144 return 1
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145
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146
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147 def expandvars(path):
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148 """Dummy to retain interface-compatibility with other operating systems."""
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149 return path
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150
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151
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152 def expanduser(path):
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153 """Dummy to retain interface-compatibility with other operating systems."""
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154 return path
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155
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156 norm_error = 'macpath.norm_error: path cannot be normalized'
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157
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158 def normpath(s):
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159 """Normalize a pathname: get rid of '::' sequences by backing up,
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160 e.g., 'foo:bar::bletch' becomes 'foo:bletch'.
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161 Raise the exception norm_error below if backing up is impossible,
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162 e.g., for '::foo'."""
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163 # XXX The Unix version doesn't raise an exception but simply
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164 # returns an unnormalized path. Should do so here too.
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165
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166 import string
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167 if ':' not in s:
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168 return ':' + s
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169 f = string.splitfields(s, ':')
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170 pre = []
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171 post = []
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172 if not f[0]:
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173 pre = f[:1]
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174 f = f[1:]
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175 if not f[len(f)-1]:
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176 post = f[-1:]
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177 f = f[:-1]
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178 res = []
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179 for seg in f:
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180 if seg:
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181 res.append(seg)
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182 else:
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183 if not res: raise norm_error, 'path starts with ::'
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184 del res[len(res)-1]
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185 if not (pre or res):
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186 raise norm_error, 'path starts with volume::'
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187 if pre: res = pre + res
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188 if post: res = res + post
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189 s = res[0]
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190 for seg in res[1:]:
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191 s = s + ':' + seg
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192 return s
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193
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194
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195 def walk(top, func, arg):
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196 """Directory tree walk.
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197 For each directory under top (including top itself),
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198 func(arg, dirname, filenames) is called, where
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199 dirname is the name of the directory and filenames is the list
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200 of files (and subdirectories etc.) in the directory.
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201 The func may modify the filenames list, to implement a filter,
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202 or to impose a different order of visiting."""
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203
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204 try:
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205 names = os.listdir(top)
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206 except os.error:
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207 return
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208 func(arg, top, names)
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209 for name in names:
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210 name = join(top, name)
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211 if isdir(name):
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212 walk(name, func, arg)
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213
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214
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215 def abspath(path):
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216 """Return an absolute path."""
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217 if not isabs(path):
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218 path = join(os.getcwd(), path)
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219 return normpath(path)