Mercurial > cpython-lru_cache-weakref
annotate Lib/macpath.py @ 28646:193b8aec00ce legacy-trunk
Changes from Jonathan Riehl to allow his pgen extension (PEP 269) to
work. This includes some more code that used to be part of pgen in
the main parser; I'm okay with that. I'll see if the Windows build
needs work next.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Thu, 17 Apr 2003 14:55:42 +0000 |
| parents | 2d59ca29f384 |
| children | e196b823e6c5 |
| rev | line source |
|---|---|
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1 """Pathname and path-related operations for the Macintosh.""" |
| 103 | 2 |
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3 import os |
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4 from stat import * |
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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","getctime", "islink","exists","isdir","isfile", |
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9 "walk","expanduser","expandvars","normpath","abspath", |
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10 "curdir","pardir","sep","pathsep","defpath","altsep","extsep", |
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11 "realpath","supports_unicode_filenames"] |
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12 |
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13 # strings representing various path-related bits and pieces |
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14 curdir = ':' |
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15 pardir = '::' |
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16 extsep = '.' |
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17 sep = ':' |
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18 pathsep = '\n' |
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19 defpath = ':' |
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20 altsep = None |
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21 |
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22 # Normalize the case of a pathname. Dummy in Posix, but <s>.lower() here. |
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23 |
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24 def normcase(path): |
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25 return path.lower() |
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26 |
| 103 | 27 |
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28 def isabs(s): |
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29 """Return true if a path is absolute. |
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30 On the Mac, relative paths begin with a colon, |
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31 but as a special case, paths with no colons at all are also relative. |
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32 Anything else is absolute (the string up to the first colon is the |
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33 volume name).""" |
| 103 | 34 |
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35 return ':' in s and s[0] != ':' |
| 103 | 36 |
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37 |
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join(): join one or more path components
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38 def join(s, *p): |
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39 path = s |
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40 for t in p: |
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41 if (not s) or isabs(t): |
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42 path = t |
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43 continue |
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44 if t[:1] == ':': |
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45 t = t[1:] |
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46 if ':' not in path: |
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47 path = ':' + path |
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48 if path[-1:] != ':': |
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49 path = path + ':' |
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50 path = path + t |
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51 return path |
| 103 | 52 |
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53 |
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54 def split(s): |
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55 """Split a pathname into two parts: the directory leading up to the final |
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56 bit, and the basename (the filename, without colons, in that directory). |
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57 The result (s, t) is such that join(s, t) yields the original argument.""" |
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58 |
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59 if ':' not in s: return '', s |
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60 colon = 0 |
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61 for i in range(len(s)): |
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62 if s[i] == ':': colon = i + 1 |
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63 path, file = s[:colon-1], s[colon:] |
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64 if path and not ':' in path: |
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65 path = path + ':' |
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66 return path, file |
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67 |
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68 |
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69 def splitext(p): |
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70 """Split a path into root and extension. |
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71 The extension is everything starting at the last dot in the last |
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72 pathname component; the root is everything before that. |
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73 It is always true that root + ext == p.""" |
| 3793 | 74 |
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75 i = p.rfind('.') |
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76 if i<=p.rfind(':'): |
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77 return p, '' |
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78 else: |
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79 return p[:i], p[i:] |
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| 81 | |
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82 def splitdrive(p): |
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83 """Split a pathname into a drive specification and the rest of the |
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84 path. Useful on DOS/Windows/NT; on the Mac, the drive is always |
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85 empty (don't use the volume name -- it doesn't have the same |
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86 syntactic and semantic oddities as DOS drive letters, such as there |
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87 being a separate current directory per drive).""" |
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88 |
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89 return '', p |
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90 |
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91 |
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92 # Short interfaces to split() |
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93 |
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94 def dirname(s): return split(s)[0] |
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95 def basename(s): return split(s)[1] |
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96 |
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98 if not isabs(s): |
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99 return False |
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100 components = split(s) |
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101 return len(components) == 2 and components[1] == '' |
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102 |
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103 def isdir(s): |
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104 """Return true if the pathname refers to an existing directory.""" |
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105 |
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106 try: |
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107 st = os.stat(s) |
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108 except os.error: |
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109 return 0 |
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110 return S_ISDIR(st.st_mode) |
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112 |
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113 # Get size, mtime, atime of files. |
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114 |
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115 def getsize(filename): |
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116 """Return the size of a file, reported by os.stat().""" |
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117 return os.stat(filename).st_size |
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118 |
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119 def getmtime(filename): |
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120 """Return the last modification time of a file, reported by os.stat().""" |
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121 return os.stat(filename).st_mtime |
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122 |
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123 def getatime(filename): |
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124 """Return the last access time of a file, reported by os.stat().""" |
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125 return os.stat(filename).st_atime |
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126 |
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127 |
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128 def islink(s): |
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129 """Return true if the pathname refers to a symbolic link.""" |
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131 try: |
| 28098 | 132 import Carbon.File |
| 133 return Carbon.File.ResolveAliasFile(s, 0)[2] | |
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134 except: |
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135 return False |
| 2260 | 136 |
| 137 | |
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138 def isfile(s): |
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139 """Return true if the pathname refers to an existing regular file.""" |
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140 |
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141 try: |
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142 st = os.stat(s) |
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143 except os.error: |
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144 return False |
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145 return S_ISREG(st.st_mode) |
| 103 | 146 |
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147 def getctime(filename): |
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148 """Return the creation time of a file, reported by os.stat().""" |
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149 return os.stat(filename).st_ctime |
|
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150 |
| 103 | 151 def exists(s): |
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152 """Return True if the pathname refers to an existing file or directory.""" |
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153 |
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154 try: |
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155 st = os.stat(s) |
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156 except os.error: |
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157 return False |
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158 return True |
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159 |
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160 # Return the longest prefix of all list elements. |
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161 |
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162 def commonprefix(m): |
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163 "Given a list of pathnames, returns the longest common leading component" |
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164 if not m: return '' |
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165 prefix = m[0] |
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166 for item in m: |
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167 for i in range(len(prefix)): |
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168 if prefix[:i+1] != item[:i+1]: |
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169 prefix = prefix[:i] |
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170 if i == 0: return '' |
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171 break |
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172 return prefix |
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173 |
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174 def expandvars(path): |
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175 """Dummy to retain interface-compatibility with other operating systems.""" |
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176 return path |
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177 |
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178 |
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179 def expanduser(path): |
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180 """Dummy to retain interface-compatibility with other operating systems.""" |
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181 return path |
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182 |
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183 class norm_error(Exception): |
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184 """Path cannot be normalized""" |
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185 |
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186 def normpath(s): |
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187 """Normalize a pathname. Will return the same result for |
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188 equivalent paths.""" |
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189 |
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190 if ":" not in s: |
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191 return ":"+s |
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192 |
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193 comps = s.split(":") |
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194 i = 1 |
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195 while i < len(comps)-1: |
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196 if comps[i] == "" and comps[i-1] != "": |
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197 if i > 1: |
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198 del comps[i-1:i+1] |
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199 i = i - 1 |
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200 else: |
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201 # best way to handle this is to raise an exception |
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202 raise norm_error, 'Cannot use :: immediately after volume name' |
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203 else: |
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204 i = i + 1 |
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205 |
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206 s = ":".join(comps) |
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207 |
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208 # remove trailing ":" except for ":" and "Volume:" |
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209 if s[-1] == ":" and len(comps) > 2 and s != ":"*len(s): |
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210 s = s[:-1] |
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211 return s |
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212 |
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213 |
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214 def walk(top, func, arg): |
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215 """Directory tree walk with callback function. |
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216 |
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217 For each directory in the directory tree rooted at top (including top |
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218 itself, but excluding '.' and '..'), call func(arg, dirname, fnames). |
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219 dirname is the name of the directory, and fnames a list of the names of |
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220 the files and subdirectories in dirname (excluding '.' and '..'). func |
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221 may modify the fnames list in-place (e.g. via del or slice assignment), |
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222 and walk will only recurse into the subdirectories whose names remain in |
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223 fnames; this can be used to implement a filter, or to impose a specific |
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224 order of visiting. No semantics are defined for, or required of, arg, |
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225 beyond that arg is always passed to func. It can be used, e.g., to pass |
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226 a filename pattern, or a mutable object designed to accumulate |
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227 statistics. Passing None for arg is common.""" |
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228 |
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229 try: |
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230 names = os.listdir(top) |
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231 except os.error: |
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232 return |
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233 func(arg, top, names) |
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234 for name in names: |
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235 name = join(top, name) |
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Fixes based on ideas from Christopher Smith:
Jack Jansen <jack.jansen@cwi.nl>
parents:
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236 if isdir(name) and not islink(name): |
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More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents:
11137
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237 walk(name, func, arg) |
| 10018 | 238 |
| 239 | |
| 240 def abspath(path): | |
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More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents:
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241 """Return an absolute path.""" |
| 10018 | 242 if not isabs(path): |
| 243 path = join(os.getcwd(), path) | |
| 244 return normpath(path) | |
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SF patch #461781 by Chris Lawrence: os.path.realpath - Resolve symlinks:
Guido van Rossum <guido@python.org>
parents:
19080
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245 |
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f2f25a738f7f
SF patch #461781 by Chris Lawrence: os.path.realpath - Resolve symlinks:
Guido van Rossum <guido@python.org>
parents:
19080
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246 # realpath is a no-op on systems without islink support |
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Fixes based on ideas from Christopher Smith:
Jack Jansen <jack.jansen@cwi.nl>
parents:
22867
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247 def realpath(path): |
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Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents:
23237
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248 path = abspath(path) |
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a90faa5f9417
Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents:
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249 try: |
| 28098 | 250 import Carbon.File |
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Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents:
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251 except ImportError: |
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a90faa5f9417
Whitespace normalization.
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parents:
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252 return path |
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Tim Peters <tim.peters@gmail.com>
parents:
23237
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253 if not path: |
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Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents:
23237
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254 return path |
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Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents:
23237
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255 components = path.split(':') |
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Tim Peters <tim.peters@gmail.com>
parents:
23237
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256 path = components[0] + ':' |
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Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents:
23237
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257 for c in components[1:]: |
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parents:
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258 path = join(path, c) |
| 28098 | 259 path = Carbon.File.FSResolveAliasFile(path, 1)[0].as_pathname() |
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parents:
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260 return path |
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Add os.path.supports_unicode_filenames for all platforms,
Mark Hammond <mhammond@skippinet.com.au>
parents:
23625
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261 |
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Add os.path.supports_unicode_filenames for all platforms,
Mark Hammond <mhammond@skippinet.com.au>
parents:
23625
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262 supports_unicode_filenames = False |
