Mercurial > cpython-lru_cache-weakref

annotate Lib/macpath.py @ 66978:aed2bbafa550 3.1

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Blocked revisions 87324 via svnmerge ........ r87324 | r.david.murray | 2010-12-16 14:08:51 -0500 (Thu, 16 Dec 2010) | 9 lines #10719: restore messages generated on invalid compileall args Before the introduction of filename arguments to compileall it gave semi useful messages about not being able to 'list' names that weren't valid directories. This fix restores that behavior. In addition to the test for this case, the patch also adds a test for the default behavior of compileall when no arguments are provided, and fixes a bug in one of the previously added tests. ........
author R. David Murray <rdmurray@bitdance.com>
date Thu, 16 Dec 2010 19:10:16 +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