Mercurial > cpython-lru_cache-weakref

annotate Lib/macpath.py @ 67467:abe201dfd3dc 3.1

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Merged revisions 87861,87863 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r87861 | antoine.pitrou | 2011-01-08 11:23:29 +0100 (sam., 08 janv. 2011) | 3 lines Fix test_ssl after r87849 ........ r87863 | antoine.pitrou | 2011-01-08 11:28:11 +0100 (sam., 08 janv. 2011) | 3 lines Add EHOSTUNREACH ('No route to host') to the errnos trapped by transient_internet(). ........
author Antoine Pitrou <solipsis@pitrou.net>
date Sat, 08 Jan 2011 10:31:09 +0000
parents e63d4678fca7
children 3c9232a684ae
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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 import genericpath
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6 from genericpath import *
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7
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8 __all__ = ["normcase","isabs","join","splitdrive","split","splitext",
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9 "basename","dirname","commonprefix","getsize","getmtime",
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10 "getatime","getctime", "islink","exists","lexists","isdir","isfile",
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11 "expanduser","expandvars","normpath","abspath",
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12 "curdir","pardir","sep","pathsep","defpath","altsep","extsep",
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13 "devnull","realpath","supports_unicode_filenames"]
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14
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15 # strings representing various path-related bits and pieces
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16 # These are primarily for export; internally, they are hardcoded.
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17 curdir = ':'
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18 pardir = '::'
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19 extsep = '.'
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20 sep = ':'
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21 pathsep = '\n'
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22 defpath = ':'
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23 altsep = None
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24 devnull = 'Dev:Null'
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25
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26 def _get_colon(path):
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27 if isinstance(path, bytes):
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28 return b':'
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29 else:
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30 return ':'
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31
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32 # Normalize the case of a pathname. Dummy in Posix, but <s>.lower() here.
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33
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34 def normcase(path):
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35 return path.lower()
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36
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38 def isabs(s):
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39 """Return true if a path is absolute.
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40 On the Mac, relative paths begin with a colon,
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41 but as a special case, paths with no colons at all are also relative.
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42 Anything else is absolute (the string up to the first colon is the
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43 volume name)."""
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44
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45 colon = _get_colon(s)
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46 return colon in s and s[:1] != colon
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48
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49 def join(s, *p):
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50 colon = _get_colon(s)
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51 path = s
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52 for t in p:
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53 if (not s) or isabs(t):
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54 path = t
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55 continue
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56 if t[:1] == colon:
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57 t = t[1:]
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58 if colon not in path:
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59 path = colon + path
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60 if path[-1:] != colon:
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61 path = path + colon
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62 path = path + t
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63 return path
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66 def split(s):
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67 """Split a pathname into two parts: the directory leading up to the final
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68 bit, and the basename (the filename, without colons, in that directory).
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69 The result (s, t) is such that join(s, t) yields the original argument."""
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71 colon = _get_colon(s)
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72 if colon not in s: return s[:0], s
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73 col = 0
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74 for i in range(len(s)):
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75 if s[i:i+1] == colon: col = i + 1
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76 path, file = s[:col-1], s[col:]
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77 if path and not colon in path:
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78 path = path + colon
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79 return path, file
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81
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82 def splitext(p):
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83 if isinstance(p, bytes):
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84 return genericpath._splitext(p, b':', altsep, b'.')
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85 else:
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86 return genericpath._splitext(p, sep, altsep, extsep)
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87 splitext.__doc__ = genericpath._splitext.__doc__
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88
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89 def splitdrive(p):
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90 """Split a pathname into a drive specification and the rest of the
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91 path. Useful on DOS/Windows/NT; on the Mac, the drive is always
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92 empty (don't use the volume name -- it doesn't have the same
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93 syntactic and semantic oddities as DOS drive letters, such as there
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94 being a separate current directory per drive)."""
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95
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96 return p[:0], p
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98
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99 # Short interfaces to split()
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100
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101 def dirname(s): return split(s)[0]
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102 def basename(s): return split(s)[1]
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104 def ismount(s):
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105 if not isabs(s):
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106 return False
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107 components = split(s)
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108 return len(components) == 2 and not components[1]
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110 def islink(s):
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111 """Return true if the pathname refers to a symbolic link."""
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112
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113 try:
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114 import Carbon.File
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115 return Carbon.File.ResolveAliasFile(s, 0)[2]
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116 except:
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117 return False
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118
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119 # Is `stat`/`lstat` a meaningful difference on the Mac? This is safe in any
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120 # case.
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122 def lexists(path):
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123 """Test whether a path exists. Returns True for broken symbolic links"""
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124
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125 try:
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126 st = os.lstat(path)
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127 except os.error:
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128 return False
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129 return True
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131 def expandvars(path):
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132 """Dummy to retain interface-compatibility with other operating systems."""
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133 return path
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134
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135
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136 def expanduser(path):
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137 """Dummy to retain interface-compatibility with other operating systems."""
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138 return path
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139
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140 class norm_error(Exception):
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141 """Path cannot be normalized"""
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142
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143 def normpath(s):
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144 """Normalize a pathname. Will return the same result for
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145 equivalent paths."""
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146
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147 colon = _get_colon(s)
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148
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149 if colon not in s:
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150 return colon + s
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151
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152 comps = s.split(colon)
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153 i = 1
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154 while i < len(comps)-1:
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155 if not comps[i] and comps[i-1]:
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156 if i > 1:
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157 del comps[i-1:i+1]
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158 i = i - 1
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159 else:
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160 # best way to handle this is to raise an exception
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161 raise norm_error('Cannot use :: immediately after volume name')
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162 else:
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163 i = i + 1
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164
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165 s = colon.join(comps)
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166
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167 # remove trailing ":" except for ":" and "Volume:"
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168 if s[-1:] == colon and len(comps) > 2 and s != colon*len(s):
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169 s = s[:-1]
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170 return s
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171
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172 def abspath(path):
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173 """Return an absolute path."""
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174 if not isabs(path):
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175 if isinstance(path, bytes):
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176 cwd = os.getcwdb()
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177 else:
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178 cwd = os.getcwd()
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179 path = join(cwd, path)
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180 return normpath(path)
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181
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182 # realpath is a no-op on systems without islink support
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183 def realpath(path):
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184 path = abspath(path)
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185 try:
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186 import Carbon.File
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187 except ImportError:
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188 return path
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189 if not path:
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190 return path
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191 colon = _get_colon(path)
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192 components = path.split(colon)
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193 path = components[0] + colon
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194 for c in components[1:]:
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195 path = join(path, c)
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196 try:
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197 path = Carbon.File.FSResolveAliasFile(path, 1)[0].as_pathname()
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198 except Carbon.File.Error:
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199 pass
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200 return path
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201
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202 supports_unicode_filenames = False