Mercurial > cpython-lru_cache-weakref

annotate Lib/ntpath.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 03dd1ded5cb3
children 5b2c595428fa
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rev   line source
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1 # Module 'ntpath' -- common operations on DOS pathnames
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2
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3 import os
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4 import stat
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5 import string
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6
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7
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8 # Normalize the case of a pathname.
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9 # On MS-DOS it maps the pathname to lowercase, turns slashes into
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10 # backslashes.
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11 # Other normalizations (such as optimizing '../' away) are not allowed
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12 # (this is done by normpath).
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13 # Previously, this version mapped invalid consecutive characters to a
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14 # single '_', but this has been removed. This functionality should
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15 # possibly be added as a new function.
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16
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17 def normcase(s):
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18 res, s = splitdrive(s)
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19 for c in s:
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20 if c in '/\\':
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21 res = res + os.sep
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22 else:
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23 res = res + c
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24 return string.lower(res)
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25
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26
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27 # Return wheter a path is absolute.
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28 # Trivial in Posix, harder on the Mac or MS-DOS.
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29 # For DOS it is absolute if it starts with a slash or backslash (current
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30 # volume), or if a pathname after the volume letter and colon starts with
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31 # a slash or backslash.
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32
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33 def isabs(s):
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34 s = splitdrive(s)[1]
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35 return s != '' and s[:1] in '/\\'
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36
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37
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38 # Join two (or more) paths.
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39
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40 def join(a, *p):
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41 path = a
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42 for b in p:
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43 if isabs(b):
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44 path = b
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45 elif path == '' or path[-1:] in '/\\':
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46 path = path + b
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47 else:
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48 path = path + os.sep + b
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49 return path
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50
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51
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52 # Split a path in a drive specification (a drive letter followed by a
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53 # colon) and the path specification.
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54 # It is always true that drivespec + pathspec == p
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55 def splitdrive(p):
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56 if p[1:2] == ':':
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57 return p[0:2], p[2:]
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58 return '', p
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59
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60
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61 # Split a path in head (everything up to the last '/') and tail (the
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62 # rest). If the original path ends in '/' but is not the root, this
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63 # '/' is stripped. After the trailing '/' is stripped, the invariant
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64 # join(head, tail) == p holds.
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65 # The resulting head won't end in '/' unless it is the root.
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66
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67 def split(p):
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68 d, p = splitdrive(p)
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69 slashes = ''
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70 while p and p[-1:] in '/\\':
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71 slashes = slashes + p[-1]
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72 p = p[:-1]
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73 if p == '':
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74 p = p + slashes
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75 head, tail = '', ''
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76 for c in p:
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77 tail = tail + c
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78 if c in '/\\':
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79 head, tail = head + tail, ''
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80 slashes = ''
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81 while head and head[-1:] in '/\\':
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82 slashes = slashes + head[-1]
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83 head = head[:-1]
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84 if head == '':
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85 head = head + slashes
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86 return d + head, tail
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87
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88
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89 # Split a path in root and extension.
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90 # The extension is everything starting at the last dot in the last
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91 # pathname component; the root is everything before that.
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92 # It is always true that root + ext == p.
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93
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94 def splitext(p):
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95 root, ext = '', ''
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96 for c in p:
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97 if c in ['/','\\']:
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98 root, ext = root + ext + c, ''
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99 elif c == '.':
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100 if ext:
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101 root, ext = root + ext, c
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102 else:
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103 ext = c
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104 elif ext:
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105 ext = ext + c
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106 else:
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107 root = root + c
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108 return root, ext
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109
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110
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111 # Return the tail (basename) part of a path.
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112
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113 def basename(p):
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114 return split(p)[1]
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115
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116
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117 # Return the head (dirname) part of a path.
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118
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119 def dirname(p):
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120 return split(p)[0]
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121
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122
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123 # Return the longest prefix of all list elements.
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124
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125 def commonprefix(m):
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126 if not m: return ''
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127 prefix = m[0]
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128 for item in m:
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129 for i in range(len(prefix)):
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130 if prefix[:i+1] <> item[:i+1]:
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131 prefix = prefix[:i]
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132 if i == 0: return ''
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133 break
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134 return prefix
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135
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136
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137 # Is a path a symbolic link?
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138 # This will always return false on systems where posix.lstat doesn't exist.
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139
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140 def islink(path):
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f0f8b50b5b6c Don't use 'false'; use '0'.
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141 return 0
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142
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143
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144 # Does a path exist?
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145 # This is false for dangling symbolic links.
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146
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147 def exists(path):
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148 try:
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149 st = os.stat(path)
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150 except os.error:
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151 return 0
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152 return 1
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153
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154
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155 # Is a path a dos directory?
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156 # This follows symbolic links, so both islink() and isdir() can be true
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157 # for the same path.
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158
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159 def isdir(path):
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160 try:
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161 st = os.stat(path)
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162 except os.error:
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163 return 0
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164 return stat.S_ISDIR(st[stat.ST_MODE])
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165
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166
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167 # Is a path a regular file?
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168 # This follows symbolic links, so both islink() and isdir() can be true
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169 # for the same path.
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170
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171 def isfile(path):
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172 try:
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173 st = os.stat(path)
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174 except os.error:
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175 return 0
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176 return stat.S_ISREG(st[stat.ST_MODE])
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177
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178
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179 # Are two filenames really pointing to the same file?
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180
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181 def samefile(f1, f2):
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182 s1 = os.stat(f1)
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183 s2 = os.stat(f2)
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184 return samestat(s1, s2)
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185
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186
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187 # Are two open files really referencing the same file?
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Guido van Rossum <guido@python.org>
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188 # (Not necessarily the same file descriptor!)
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189 # XXX THIS IS BROKEN UNDER DOS! ST_INO seems to indicate number of reads?
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190
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191 def sameopenfile(fp1, fp2):
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192 s1 = os.fstat(fp1.fileno())
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193 s2 = os.fstat(fp2.fileno())
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194 return samestat(s1, s2)
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195
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196
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197 # Are two stat buffers (obtained from stat, fstat or lstat)
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198 # describing the same file?
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199
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200 def samestat(s1, s2):
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201 return s1[stat.ST_INO] == s2[stat.ST_INO] and \
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202 s1[stat.ST_DEV] == s2[stat.ST_DEV]
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203
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
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204
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
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205 # Is a path a mount point?
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Guido van Rossum <guido@python.org>
parents:
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206 # XXX This degenerates in: 'is this the root?' on DOS
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207
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208 def ismount(path):
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209 return isabs(splitdrive(path)[1])
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210
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Guido van Rossum <guido@python.org>
parents:
diff changeset
211
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
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212 # Directory tree walk.
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Guido van Rossum <guido@python.org>
parents:
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213 # For each directory under top (including top itself, but excluding
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214 # '.' and '..'), func(arg, dirname, filenames) is called, where
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215 # dirname is the name of the directory and filenames is the list
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parents:
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216 # files files (and subdirectories etc.) in the directory.
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parents:
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217 # The func may modify the filenames list, to implement a filter,
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
218 # or to impose a different order of visiting.
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Guido van Rossum <guido@python.org>
parents:
diff changeset
219
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
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diff changeset
220 def walk(top, func, arg):
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
221 try:
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
222 names = os.listdir(top)
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
223 except os.error:
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
224 return
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
225 func(arg, top, names)
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
226 exceptions = ('.', '..')
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
227 for name in names:
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
228 if name not in exceptions:
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Guido van Rossum <guido@python.org>
parents:
diff changeset
229 name = join(top, name)
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
230 if isdir(name):
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
231 walk(name, func, arg)
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
232
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
233
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
234 # Expand paths beginning with '~' or '~user'.
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
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parents:
diff changeset
235 # '~' means $HOME; '~user' means that user's home directory.
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
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parents:
diff changeset
236 # If the path doesn't begin with '~', or if the user or $HOME is unknown,
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
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parents:
diff changeset
237 # the path is returned unchanged (leaving error reporting to whatever
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
238 # function is called with the expanded path as argument).
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parents:
diff changeset
239 # See also module 'glob' for expansion of *, ? and [...] in pathnames.
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parents:
diff changeset
240 # (A function should also be defined to do full *sh-style environment
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
241 # variable expansion.)
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Guido van Rossum <guido@python.org>
parents:
diff changeset
242
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
243 def expanduser(path):
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
244 if path[:1] <> '~':
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
245 return path
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
246 i, n = 1, len(path)
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
247 while i < n and path[i] not in '/\\':
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
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diff changeset
248 i = i+1
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
249 if i == 1:
5703
03dd1ded5cb3 Support $HOME in expanduser().
Guido van Rossum <guido@python.org>
parents: 5136
diff changeset
250 if os.environ.has_key('HOME'):
03dd1ded5cb3 Support $HOME in expanduser().
Guido van Rossum <guido@python.org>
parents: 5136
diff changeset
251 userhome = os.environ['HOME']
03dd1ded5cb3 Support $HOME in expanduser().
Guido van Rossum <guido@python.org>
parents: 5136
diff changeset
252 elif not os.environ.has_key('HOMEPATH'):
1561
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parents:
diff changeset
253 return path
5703
03dd1ded5cb3 Support $HOME in expanduser().
Guido van Rossum <guido@python.org>
parents: 5136
diff changeset
254 else:
03dd1ded5cb3 Support $HOME in expanduser().
Guido van Rossum <guido@python.org>
parents: 5136
diff changeset
255 try:
03dd1ded5cb3 Support $HOME in expanduser().
Guido van Rossum <guido@python.org>
parents: 5136
diff changeset
256 drive=os.environ['HOMEDRIVE']
03dd1ded5cb3 Support $HOME in expanduser().
Guido van Rossum <guido@python.org>
parents: 5136
diff changeset
257 except KeyError:
03dd1ded5cb3 Support $HOME in expanduser().
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parents: 5136
diff changeset
258 drive = ''
03dd1ded5cb3 Support $HOME in expanduser().
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parents: 5136
diff changeset
259 userhome = join(drive, os.environ['HOMEPATH'])
1561
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
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parents:
diff changeset
260 else:
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
261 return path
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
262 return userhome + path[i:]
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Guido van Rossum <guido@python.org>
parents:
diff changeset
263
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
264
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
265 # Expand paths containing shell variable substitutions.
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
Guido van Rossum <guido@python.org>
parents:
diff changeset
266 # The following rules apply:
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
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parents:
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267 # - no expansion within single quotes
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Guido van Rossum <guido@python.org>
parents:
diff changeset
268 # - no escape character, except for '$$' which is translated into '$'
8aabe9aae0fa Added ntpath.py (for os.py when used with Windows NT)
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parents:
diff changeset
269 # - ${varname} is accepted.
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parents:
diff changeset
270 # - varnames can be made out of letters, digits and the character '_'
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parents:
diff changeset
271 # XXX With COMMAND.COM you can use any characters in a variable name,
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272 # XXX except '^|<>='.
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273
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274 varchars = string.letters + string.digits + '_-'
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275
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276 def expandvars(path):
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277 if '$' not in path:
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278 return path
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279 res = ''
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280 index = 0
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281 pathlen = len(path)
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282 while index < pathlen:
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283 c = path[index]
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284 if c == '\'': # no expansion within single quotes
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285 path = path[index + 1:]
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286 pathlen = len(path)
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287 try:
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288 index = string.index(path, '\'')
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289 res = res + '\'' + path[:index + 1]
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290 except string.index_error:
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291 res = res + path
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292 index = pathlen -1
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293 elif c == '$': # variable or '$$'
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294 if path[index + 1:index + 2] == '$':
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295 res = res + c
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296 index = index + 1
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297 elif path[index + 1:index + 2] == '{':
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298 path = path[index+2:]
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299 pathlen = len(path)
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300 try:
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301 index = string.index(path, '}')
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302 var = path[:index]
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303 if os.environ.has_key(var):
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304 res = res + os.environ[var]
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305 except string.index_error:
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306 res = res + path
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307 index = pathlen - 1
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308 else:
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309 var = ''
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310 index = index + 1
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311 c = path[index:index + 1]
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312 while c != '' and c in varchars:
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313 var = var + c
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314 index = index + 1
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315 c = path[index:index + 1]
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316 if os.environ.has_key(var):
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317 res = res + os.environ[var]
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318 if c != '':
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319 res = res + c
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320 else:
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321 res = res + c
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322 index = index + 1
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323 return res
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324
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325
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326 # Normalize a path, e.g. A//B, A/./B and A/foo/../B all become A/B.
4150
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327 # Previously, this function also truncated pathnames to 8+3 format,
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328 # but as this module is called "ntpath", that's obviously wrong!
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329
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330 def normpath(path):
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331 path = normcase(path)
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332 prefix, path = splitdrive(path)
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333 while path[:1] == os.sep:
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334 prefix = prefix + os.sep
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335 path = path[1:]
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336 comps = string.splitfields(path, os.sep)
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337 i = 0
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338 while i < len(comps):
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339 if comps[i] == '.':
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340 del comps[i]
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341 elif comps[i] == '..' and i > 0 and \
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342 comps[i-1] not in ('', '..'):
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343 del comps[i-1:i+1]
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344 i = i-1
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345 elif comps[i] == '' and i > 0 and comps[i-1] <> '':
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346 del comps[i]
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347 else:
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348 i = i+1
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349 # If the path is now empty, substitute '.'
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350 if not prefix and not comps:
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351 comps.append('.')
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352 return prefix + string.joinfields(comps, os.sep)