Mercurial > cpython-lru_cache-weakref

annotate Lib/ntpath.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 8a0d43b13125
children 0ea4ea5b2eb7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 # Return wheter a path is absolute.
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27 # Trivial in Posix, harder on the Mac or MS-DOS.
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28 # For DOS it is absolute if it starts with a slash or backslash (current
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29 # volume), or if a pathname after the volume letter and colon starts with
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30 # a slash or backslash.
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31
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32 def isabs(s):
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33 s = splitdrive(s)[1]
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34 return s != '' and s[:1] in '/\\'
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35
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36
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37 # Join two pathnames.
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38 # Ignore the first part if the second part is absolute.
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39 # Insert a '/' unless the first part is empty or already ends in '/'.
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40
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41 def join(a, b):
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42 if isabs(b): return b
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43 if a == '' or a[-1:] in '/\\': return a + b
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44 # Note: join('x', '') returns 'x/'; is this what we want?
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45 return a + os.sep + b
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46
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47
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48 # Split a path in a drive specification (a drive letter followed by a
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49 # colon) and the path specification.
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50 # It is always true that drivespec + pathspec == p
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51 def splitdrive(p):
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52 if p[1:2] == ':':
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53 return p[0:2], p[2:]
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54 return '', p
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56
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57 # Split a path in head (everything up to the last '/') and tail (the
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58 # rest). If the original path ends in '/' but is not the root, this
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59 # '/' is stripped. After the trailing '/' is stripped, the invariant
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60 # join(head, tail) == p holds.
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61 # The resulting head won't end in '/' unless it is the root.
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62
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63 def split(p):
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64 d, p = splitdrive(p)
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65 slashes = ''
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66 while p and p[-1:] in '/\\':
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67 slashes = slashes + p[-1]
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68 p = p[:-1]
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69 if p == '':
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70 p = p + slashes
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71 head, tail = '', ''
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72 for c in p:
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73 tail = tail + c
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74 if c in '/\\':
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75 head, tail = head + tail, ''
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76 slashes = ''
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77 while head and head[-1:] in '/\\':
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78 slashes = slashes + head[-1]
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79 head = head[:-1]
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80 if head == '':
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81 head = head + slashes
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82 return d + head, tail
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83
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84
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85 # Split a path in root and extension.
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86 # The extension is everything starting at the first dot in the last
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87 # pathname component; the root is everything before that.
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88 # It is always true that root + ext == p.
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89
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90 def splitext(p):
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91 root, ext = '', ''
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92 for c in p:
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93 if c in '/\\':
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94 root, ext = root + ext + c, ''
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95 elif c == '.' or ext:
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96 ext = ext + c
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97 else:
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98 root = root + c
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99 return root, ext
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100
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101
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102 # Return the tail (basename) part of a path.
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103
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104 def basename(p):
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105 return split(p)[1]
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106
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107
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108 # Return the head (dirname) part of a path.
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109
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110 def dirname(p):
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111 return split(p)[0]
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112
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113
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114 # Return the longest prefix of all list elements.
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115
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116 def commonprefix(m):
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117 if not m: return ''
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118 prefix = m[0]
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119 for item in m:
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120 for i in range(len(prefix)):
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121 if prefix[:i+1] <> item[:i+1]:
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122 prefix = prefix[:i]
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123 if i == 0: return ''
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124 break
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125 return prefix
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126
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127
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128 # Is a path a symbolic link?
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129 # This will always return false on systems where posix.lstat doesn't exist.
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130
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131 def islink(path):
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132 return 0
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133
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134
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135 # Does a path exist?
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136 # This is false for dangling symbolic links.
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137
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138 def exists(path):
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139 try:
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140 st = os.stat(path)
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141 except os.error:
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142 return 0
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143 return 1
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144
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145
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146 # Is a path a dos directory?
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147 # This follows symbolic links, so both islink() and isdir() can be true
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148 # for the same path.
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149
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150 def isdir(path):
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151 try:
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152 st = os.stat(path)
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153 except os.error:
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154 return 0
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155 return stat.S_ISDIR(st[stat.ST_MODE])
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156
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157
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158 # Is a path a regular file?
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159 # This follows symbolic links, so both islink() and isdir() can be true
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160 # for the same path.
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161
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162 def isfile(path):
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163 try:
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164 st = os.stat(path)
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165 except os.error:
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166 return 0
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167 return stat.S_ISREG(st[stat.ST_MODE])
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168
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169
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170 # Are two filenames really pointing to the same file?
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171
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172 def samefile(f1, f2):
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173 s1 = os.stat(f1)
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174 s2 = os.stat(f2)
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175 return samestat(s1, s2)
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176
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177
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178 # Are two open files really referencing the same file?
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179 # (Not necessarily the same file descriptor!)
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180 # XXX THIS IS BROKEN UNDER DOS! ST_INO seems to indicate number of reads?
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181
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182 def sameopenfile(fp1, fp2):
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183 s1 = os.fstat(fp1.fileno())
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184 s2 = os.fstat(fp2.fileno())
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185 return samestat(s1, s2)
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186
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187
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188 # Are two stat buffers (obtained from stat, fstat or lstat)
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189 # describing the same file?
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190
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191 def samestat(s1, s2):
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192 return s1[stat.ST_INO] == s2[stat.ST_INO] and \
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193 s1[stat.ST_DEV] == s2[stat.ST_DEV]
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194
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195
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196 # Is a path a mount point?
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197 # XXX This degenerates in: 'is this the root?' on DOS
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198
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199 def ismount(path):
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200 return isabs(splitdrive(path)[1])
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201
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202
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203 # Directory tree walk.
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204 # For each directory under top (including top itself, but excluding
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205 # '.' and '..'), func(arg, dirname, filenames) is called, where
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206 # dirname is the name of the directory and filenames is the list
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207 # files files (and subdirectories etc.) in the directory.
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208 # The func may modify the filenames list, to implement a filter,
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209 # or to impose a different order of visiting.
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210
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211 def walk(top, func, arg):
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212 try:
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213 names = os.listdir(top)
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214 except os.error:
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215 return
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216 func(arg, top, names)
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217 exceptions = ('.', '..')
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218 for name in names:
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219 if name not in exceptions:
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220 name = join(top, name)
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221 if isdir(name):
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222 walk(name, func, arg)
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223
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224
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225 # Expand paths beginning with '~' or '~user'.
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diff changeset
226 # '~' means $HOME; '~user' means that user's home directory.
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227 # If the path doesn't begin with '~', or if the user or $HOME is unknown,
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228 # the path is returned unchanged (leaving error reporting to whatever
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229 # function is called with the expanded path as argument).
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230 # See also module 'glob' for expansion of *, ? and [...] in pathnames.
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231 # (A function should also be defined to do full *sh-style environment
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232 # variable expansion.)
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233
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234 def expanduser(path):
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diff changeset
235 if path[:1] <> '~':
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236 return path
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237 i, n = 1, len(path)
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diff changeset
238 while i < n and path[i] not in '/\\':
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239 i = i+1
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240 if i == 1:
2955
527d1b292525 same thing as for dospath, plus HOMEDRIVE/HOMEPATH support
Guido van Rossum <guido@python.org>
parents: 1561
diff changeset
241 try:
527d1b292525 same thing as for dospath, plus HOMEDRIVE/HOMEPATH support
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diff changeset
242 drive=os.environ['HOMEDRIVE']
527d1b292525 same thing as for dospath, plus HOMEDRIVE/HOMEPATH support
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parents: 1561
diff changeset
243 except KeyError:
527d1b292525 same thing as for dospath, plus HOMEDRIVE/HOMEPATH support
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parents: 1561
diff changeset
244 drive = ''
527d1b292525 same thing as for dospath, plus HOMEDRIVE/HOMEPATH support
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parents: 1561
diff changeset
245 if not os.environ.has_key('HOMEPATH'):
1561
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246 return path
2955
527d1b292525 same thing as for dospath, plus HOMEDRIVE/HOMEPATH support
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diff changeset
247 userhome = join(drive, os.environ['HOMEPATH'])
1561
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248 else:
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249 return path
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250 return userhome + path[i:]
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251
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252
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253 # Expand paths containing shell variable substitutions.
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254 # The following rules apply:
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255 # - no expansion within single quotes
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256 # - no escape character, except for '$$' which is translated into '$'
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257 # - ${varname} is accepted.
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258 # - varnames can be made out of letters, digits and the character '_'
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259 # XXX With COMMAND.COM you can use any characters in a variable name,
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260 # XXX except '^|<>='.
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261
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262 varchars = string.letters + string.digits + '_-'
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diff changeset
263
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diff changeset
264 def expandvars(path):
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diff changeset
265 if '$' not in path:
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266 return path
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267 res = ''
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268 index = 0
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269 pathlen = len(path)
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270 while index < pathlen:
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271 c = path[index]
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272 if c == '\'': # no expansion within single quotes
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273 path = path[index + 1:]
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274 pathlen = len(path)
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275 try:
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276 index = string.index(path, '\'')
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277 res = res + '\'' + path[:index + 1]
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278 except string.index_error:
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279 res = res + path
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280 index = pathlen -1
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281 elif c == '$': # variable or '$$'
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282 if path[index + 1:index + 2] == '$':
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283 res = res + c
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284 index = index + 1
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285 elif path[index + 1:index + 2] == '{':
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286 path = path[index+2:]
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287 pathlen = len(path)
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288 try:
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289 index = string.index(path, '}')
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290 var = path[:index]
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291 if os.environ.has_key(var):
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292 res = res + os.environ[var]
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293 except string.index_error:
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294 res = res + path
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295 index = pathlen - 1
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296 else:
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297 var = ''
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298 index = index + 1
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299 c = path[index:index + 1]
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300 while c != '' and c in varchars:
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301 var = var + c
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302 index = index + 1
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303 c = path[index:index + 1]
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304 if os.environ.has_key(var):
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305 res = res + os.environ[var]
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306 if c != '':
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307 res = res + c
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308 else:
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309 res = res + c
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310 index = index + 1
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311 return res
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312
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313
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314 # Normalize a path, e.g. A//B, A/./B and A/foo/../B all become A/B.
4150
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315 # Previously, this function also truncated pathnames to 8+3 format,
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316 # but as this module is called "ntpath", that's obviously wrong!
1561
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317
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318 def normpath(path):
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319 path = normcase(path)
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320 prefix, path = splitdrive(path)
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321 while path[:1] == os.sep:
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322 prefix = prefix + os.sep
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323 path = path[1:]
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324 comps = string.splitfields(path, os.sep)
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325 i = 0
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326 while i < len(comps):
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327 if comps[i] == '.':
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328 del comps[i]
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329 elif comps[i] == '..' and i > 0 and \
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330 comps[i-1] not in ('', '..'):
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331 del comps[i-1:i+1]
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332 i = i-1
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333 elif comps[i] == '' and i > 0 and comps[i-1] <> '':
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334 del comps[i]
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335 else:
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336 i = i+1
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337 # If the path is now empty, substitute '.'
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338 if not prefix and not comps:
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339 comps.append('.')
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340 return prefix + string.joinfields(comps, os.sep)