Mercurial > hgrepos > Python > apps > py-cutils
annotate cutils/util/walk.py @ 201:58d93453c307
Much more encoding-related methods for DirWalkEntry and some unittests
| author | Franz Glasner <fzglas.hg@dom66.de> |
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| date | Tue, 21 Jan 2025 14:30:06 +0100 |
| parents | b2aba84ca426 |
| children | 3a85f7bbe0b1 |
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1 # -*- coding: utf-8 -*- |
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2 # :- |
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3 # :Copyright: (c) 2020-2025 Franz Glasner |
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4 # :License: BSD-3-Clause |
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5 # :- |
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6 r"""Utility sub-module to implement a heavily customized :func:`os.walk`. |
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7 |
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8 """ |
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9 |
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10 from __future__ import print_function, absolute_import |
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11 |
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12 |
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13 __all__ = ["WalkDirEntry", "ScanDir", "getfsencoding"] |
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14 |
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15 |
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16 import os |
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17 try: |
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18 from os import scandir |
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19 except ImportError: |
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20 try: |
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21 from scandir import scandir |
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22 except ImportError: |
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23 scandir = None |
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24 import sys |
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25 |
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26 from . import PY2 |
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27 |
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28 |
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29 _notset = object() |
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30 |
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31 |
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32 _FSENCODING = sys.getfilesystemencoding() |
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33 |
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34 |
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35 if PY2: |
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36 |
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37 def _unix_path(s): |
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38 if isinstance(s, bytes): |
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39 return s.replace(b"\\", b"/") |
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40 return s.replace(u"\\", u"/") |
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41 |
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42 else: |
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43 |
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44 def _unix_path(s): |
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45 return s.replace("\\", "/") |
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46 |
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47 |
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48 class WalkDirEntry(object): |
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49 |
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50 """A :class:`os.DirEntry` alike to be used in :func:`walk` and for |
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51 its results. |
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52 |
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53 """ |
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54 |
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55 __slots__ = ("_name", "_path", # encoded as given in the ctor |
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56 "_is_symlink", "_is_dir", "_stat_result", |
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57 "_alt_fsname", "_alt_u8name") |
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58 |
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59 def __init__(self, name, path): |
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60 self._name = name # the name as given in the constructor |
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61 """The name exactly as given in the ctor""" |
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62 self._path = _unix_path(path) |
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63 """The path as given in the ctor -- but normalized to have slashes""" |
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64 self._is_symlink = self._is_dir = self._stat_result = None |
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65 self._alt_fsname = self._alt_u8name = _notset |
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66 |
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67 @property |
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68 def name(self): |
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69 """The original name exactly as given in the ctor""" |
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70 return self._name |
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71 |
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72 @property |
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73 def path(self): |
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74 """The original path exactly as given in the ctor.""" |
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75 return self._path |
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76 |
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77 @property |
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78 def fsname(self): |
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79 """The name as bytes for the filesystem. |
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80 |
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81 :rtype: bytes or None |
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82 |
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83 """ |
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84 if PY2: |
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85 if isinstance(self._name, bytes): |
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86 return self._name |
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87 try: |
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88 return self._name.encode(_FSENCODING, "strict") |
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89 except UnicodeError: |
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90 return None |
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91 else: |
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92 return os.fsencode(self._name) |
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93 |
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94 @property |
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95 def alt_fsname(self): |
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96 """Alternative and "escaped" filesystem name -- always bytes. |
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97 |
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98 :rtype: bytes |
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99 |
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100 """ |
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101 if self._alt_fsname is _notset: |
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102 if PY2: |
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103 if isinstance(self._name, bytes): |
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104 self._alt_fsname = self._name |
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105 else: |
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106 self._alt_fsname = self._name.encode( |
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107 _FSENCODING, "backslashreplace") |
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108 else: |
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109 self._alt_fsname = os.fsencode(self._name) |
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110 return self._alt_fsname |
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111 |
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112 @property |
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121
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113 def fspath(self): |
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114 """Always bytes. |
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115 |
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116 :rtype: bytes or None |
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117 |
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118 """ |
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119 if PY2: |
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120 if isinstance(self._path, bytes): |
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121 return self._path |
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122 try: |
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123 return self._path.encode(_FSENCODING, "strict") |
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124 except UnicodeError: |
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125 return None |
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126 else: |
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127 return os.fsencode(self._path) |
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128 |
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129 @property |
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130 def alt_fspath(self): |
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131 """Alternative and "escaped" filesystem path -- always bytes. |
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132 |
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133 :rtype: bytes |
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134 |
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135 """ |
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136 if PY2: |
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137 if isinstance(self._path, bytes): |
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138 return self._path |
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139 return self._path.encode(_FSENCODING, "backslashreplace") |
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140 else: |
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141 return os.fsencode(self._path) |
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142 |
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143 @property |
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144 def uname(self): |
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145 """Always "real", strictly encoded Unicode or `None` if this is not |
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146 possible. |
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147 |
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148 :rtype: text or None |
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149 |
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150 """ |
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151 if PY2: |
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152 if isinstance(self._name, bytes): |
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153 try: |
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154 return self._name.decode(_FSENCODING, "strict") |
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155 except UnicodeError: |
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156 return None |
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157 else: |
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158 return self._name |
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159 else: |
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160 try: |
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161 self._name.encode("utf-8", "strict") |
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162 except UnicodeError: |
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163 return None |
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164 return self._name |
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165 |
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166 @property |
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167 def upath(self): |
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168 """Always "real", strictly encoded Unicode or `None` if this is not |
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169 possible. |
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170 |
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171 :rtype: text or None |
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172 |
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173 """ |
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174 if PY2: |
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175 if isinstance(self._path, bytes): |
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176 try: |
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177 return self._path.decode(_FSENCODING, "strict") |
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178 except UnicodeError: |
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179 return None |
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180 else: |
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181 return self._path |
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182 else: |
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183 try: |
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184 self._path.encode("utf-8", "strict") |
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185 except UnicodeError: |
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186 return None |
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187 return self._path |
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188 |
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189 @property |
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190 def u8name(self): |
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191 """`.uname` as UTF-8 or `None` (as strict as `uname`)""" |
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192 n = self.uname |
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193 return n if n is None else n.encode("utf-8", "strict") |
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194 |
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195 @property |
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196 def u8path(self): |
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197 """`.upath` as UTF-8 or `None` (as strict as `upath`""" |
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198 p = self.upath |
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199 return p if p is None else p.encode("utf-8", "strict") |
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200 |
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201 @property |
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202 def alt_u8name(self): |
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203 if self._alt_u8name is _notset: |
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204 if PY2: |
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205 if isinstance(self._name, bytes): |
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206 try: |
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207 self._alt_u8name = ( |
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208 self._name |
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209 .decode(_FSENCODING, "strict") |
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210 .encode("utf-8", "strict")) |
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211 except UnicodeError: |
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212 self._alt_u8name = ( |
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213 self.surrogate_decode(self._name) |
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214 .encode("ascii", "backslashreplace")) |
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215 else: |
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216 self._alt_u8name = self._name.encode( |
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217 "ascii", "backslashreplace") |
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218 else: |
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219 self._alt_u8name = self._name.encode( |
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220 "utf-8", "backslashreplace") |
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221 return self._alt_u8name |
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222 |
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223 @property |
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224 def alt_u8path(self): |
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225 if PY2: |
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226 if isinstance(self._path, bytes): |
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227 try: |
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228 return (self._path.decode(_FSENCODING, "strict") |
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229 .encode("utf-8", "strict")) |
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230 except UnicodeError: |
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231 return (self.surrogate_decode(self._path) |
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232 .encode("ascii", "backslashreplace")) |
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233 else: |
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234 return self._path.encode("ascii", "backslashreplace") |
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235 else: |
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236 return self._path.encode("utf-8", "backslashreplace") |
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237 |
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238 @property |
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239 def is_symlink(self): |
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240 return self._is_symlink |
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241 |
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242 @property |
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243 def is_dir(self): |
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244 return self._is_dir |
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245 |
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246 @property |
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247 def stat(self): |
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248 return self._stat_result |
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249 |
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250 def __repr__(self): |
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251 tag = "" |
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252 if self._is_symlink: |
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253 tag += "l" |
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254 if self._is_dir: |
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255 tag += "d" |
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256 if tag: |
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257 return "<WalkDirEntry %r (%s)>" % (self._name, tag) |
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258 return "<WalkDirEntry %r>" % (self._name,) |
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259 |
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260 @classmethod |
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261 def from_direntry(cls_, entry): |
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262 w = cls_(entry.name, entry.path) |
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263 try: |
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264 w._is_dir = entry.is_dir(follow_symlinks=True) |
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265 except OSError: |
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266 # |
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267 # If is_dir() raises an OSError, consider that the entry |
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268 # is not a directory, same behaviour than os.path.isdir(). |
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269 # |
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270 w._is_dir = False |
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271 try: |
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272 w._is_symlink = entry.is_symlink() |
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273 except OSError: |
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274 # |
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275 # If is_symlink() raises an OSError, consider that the entry |
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276 # is not a symbolic link, same behaviour than os.path.islink(). |
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277 # |
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278 w._is_symlink = False |
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156
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279 # Do not supress errors here and (consistently) follow symlinks |
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280 w._stat_result = entry.stat(follow_symlinks=True) |
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281 return w |
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282 |
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283 @classmethod |
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284 def from_path_name(cls_, path, name, _do_stat=True): |
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285 """`_nostat` is to be used only for testing purposes""" |
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286 w = cls_(name, os.path.join(path, name)) |
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287 try: |
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288 w._is_dir = os.path.isdir(w._path) |
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289 except OSError: |
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290 # |
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291 # If is_dir() raises an OSError, consider that the entry |
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292 # is not a directory, same behaviour than os.path.isdir(). |
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293 # |
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294 w._is_dir = False |
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295 try: |
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296 w._is_symlink = os.path.islink(w._path) |
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297 except OSError: |
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298 # |
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299 # If is_symlink() raises an OSError, consider that the entry |
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300 # is not a symbolic link, same behaviour than os.path.islink(). |
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301 # |
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302 w._is_symlink = False |
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303 if _do_stat: |
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304 w._stat_result = os.stat(w._path) |
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305 return w |
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306 |
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307 @classmethod |
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308 def from_readlink(cls_, path): |
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309 w = cls_(os.path.basename(path), path) |
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310 return w |
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311 |
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312 @staticmethod |
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313 def sort_key(entry): |
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314 return entry.alt_fsname # because it should never throw |
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315 |
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316 @staticmethod |
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317 def alt_sort_key(entry): |
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318 return entry.alt_u8name # because it should never throw |
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319 |
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320 if PY2: |
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321 |
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322 @staticmethod |
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323 def surrogate_decode(what): |
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324 """Decode the bytes object `what` using surrogates from :pep:`383` |
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325 for all non-ASCII octets. |
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326 |
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327 """ |
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328 uwhat = [] |
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329 assert isinstance(what, bytes) |
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330 for ch in what: |
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331 chcode = ord(ch) |
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332 if chcode <= 0x7f: |
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333 uwhat.append(unichr(chcode)) # noqa: F821 unichr |
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334 else: |
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335 uwhat.append(unichr(0xDC00 + chcode)) # noqa: F821 unichr |
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336 return u"".join(uwhat) |
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337 |
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338 |
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339 if scandir: |
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340 |
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341 class ScanDir(object): |
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342 |
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343 """An :func:`os.scandir` wrapper that is always an iterator and |
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344 a context manager. |
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345 |
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346 """ |
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347 |
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348 __slots__ = ("_scandir_it", ) |
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349 |
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350 def __init__(self, path): |
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351 super(ScanDir, self).__init__() |
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352 self._scandir_it = scandir(path) |
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353 |
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354 def __iter__(self): |
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355 return self |
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356 |
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357 def __next__(self): |
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358 if self._scandir_it is None: |
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359 raise StopIteration("closed") |
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360 return WalkDirEntry.from_direntry(next(self._scandir_it)) |
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361 |
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362 if PY2: |
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363 next = __next__ |
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364 |
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365 def __enter__(self): |
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366 return self |
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367 |
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368 def __exit__(self, *args, **kwds): |
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369 self.close() |
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370 |
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371 def close(self): |
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372 if self._scandir_it is not None: |
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373 if hasattr(self._scandir_it, "close"): |
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374 self._scandir_it.close() |
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375 self._scandir_it = None |
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376 |
|
121
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377 else: |
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378 |
|
178
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379 class ScanDir(object): |
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380 |
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381 """An :func:`os.scandir` wrapper that is always an iterator and |
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382 a context manager. |
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383 |
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384 """ |
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385 |
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386 __slots__ = ("_listdir_it", "_path") |
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387 |
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388 def __init__(self, path): |
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389 super(ScanDir, self).__init__() |
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390 self._listdir_it = iter(os.listdir(path)) |
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391 self._path = path |
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392 |
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393 def __iter__(self): |
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394 return self |
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395 |
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396 def __next__(self): |
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397 if self._listdir_it is None: |
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398 raise StopIteration("closed") |
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399 return WalkDirEntry.from_path_name(self._path, |
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400 next(self._listdir_it)) |
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401 |
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402 if PY2: |
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403 next = __next__ |
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404 |
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405 def __enter__(self): |
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406 return self |
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407 |
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408 def __exit__(self, *args, **kwds): |
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409 pass |
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410 |
|
199
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411 def close(self): |
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412 pass |
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413 |
|
198
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414 |
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415 def getfsencoding(): |
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416 """Return the stored _FSENCODING of this module""" |
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417 return _FSENCODING |