Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/zipp.py @ 0:26e78fe6e8c4 draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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0
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1 import io
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2 import posixpath
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3 import zipfile
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4 import itertools
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5 import contextlib
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6 import sys
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7
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8 if sys.version_info < (3, 7):
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9 from collections import OrderedDict
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10 else:
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11 OrderedDict = dict
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12
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13
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14 def _parents(path):
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15 """
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16 Given a path with elements separated by
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17 posixpath.sep, generate all parents of that path.
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18
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19 >>> list(_parents('b/d'))
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20 ['b']
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21 >>> list(_parents('/b/d/'))
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22 ['/b']
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23 >>> list(_parents('b/d/f/'))
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24 ['b/d', 'b']
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25 >>> list(_parents('b'))
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26 []
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27 >>> list(_parents(''))
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28 []
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29 """
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30 return itertools.islice(_ancestry(path), 1, None)
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31
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32
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33 def _ancestry(path):
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34 """
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35 Given a path with elements separated by
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36 posixpath.sep, generate all elements of that path
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37
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38 >>> list(_ancestry('b/d'))
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39 ['b/d', 'b']
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40 >>> list(_ancestry('/b/d/'))
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41 ['/b/d', '/b']
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42 >>> list(_ancestry('b/d/f/'))
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43 ['b/d/f', 'b/d', 'b']
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44 >>> list(_ancestry('b'))
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45 ['b']
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46 >>> list(_ancestry(''))
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47 []
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48 """
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49 path = path.rstrip(posixpath.sep)
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50 while path and path != posixpath.sep:
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51 yield path
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52 path, tail = posixpath.split(path)
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53
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54
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55 _dedupe = OrderedDict.fromkeys
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56 """Deduplicate an iterable in original order"""
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57
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58
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59 def _difference(minuend, subtrahend):
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60 """
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61 Return items in minuend not in subtrahend, retaining order
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62 with O(1) lookup.
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63 """
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64 return itertools.filterfalse(set(subtrahend).__contains__, minuend)
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65
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66
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67 class CompleteDirs(zipfile.ZipFile):
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68 """
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69 A ZipFile subclass that ensures that implied directories
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70 are always included in the namelist.
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71 """
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72
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73 @staticmethod
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74 def _implied_dirs(names):
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75 parents = itertools.chain.from_iterable(map(_parents, names))
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76 as_dirs = (p + posixpath.sep for p in parents)
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77 return _dedupe(_difference(as_dirs, names))
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78
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79 def namelist(self):
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80 names = super(CompleteDirs, self).namelist()
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81 return names + list(self._implied_dirs(names))
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82
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83 def _name_set(self):
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84 return set(self.namelist())
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85
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86 def resolve_dir(self, name):
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87 """
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88 If the name represents a directory, return that name
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89 as a directory (with the trailing slash).
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90 """
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91 names = self._name_set()
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92 dirname = name + '/'
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93 dir_match = name not in names and dirname in names
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94 return dirname if dir_match else name
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95
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96 @classmethod
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97 def make(cls, source):
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98 """
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99 Given a source (filename or zipfile), return an
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100 appropriate CompleteDirs subclass.
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101 """
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102 if isinstance(source, CompleteDirs):
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103 return source
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104
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105 if not isinstance(source, zipfile.ZipFile):
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106 return cls(_pathlib_compat(source))
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107
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108 # Only allow for FastPath when supplied zipfile is read-only
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109 if 'r' not in source.mode:
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110 cls = CompleteDirs
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111
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112 res = cls.__new__(cls)
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113 vars(res).update(vars(source))
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114 return res
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115
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116
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117 class FastLookup(CompleteDirs):
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118 """
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119 ZipFile subclass to ensure implicit
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120 dirs exist and are resolved rapidly.
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121 """
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122 def namelist(self):
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123 with contextlib.suppress(AttributeError):
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124 return self.__names
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125 self.__names = super(FastLookup, self).namelist()
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126 return self.__names
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127
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128 def _name_set(self):
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129 with contextlib.suppress(AttributeError):
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130 return self.__lookup
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131 self.__lookup = super(FastLookup, self)._name_set()
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132 return self.__lookup
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133
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134
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135 def _pathlib_compat(path):
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136 """
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137 For path-like objects, convert to a filename for compatibility
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138 on Python 3.6.1 and earlier.
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139 """
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140 try:
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141 return path.__fspath__()
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142 except AttributeError:
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143 return str(path)
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144
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145
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146 class Path:
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147 """
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148 A pathlib-compatible interface for zip files.
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149
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150 Consider a zip file with this structure::
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151
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152 .
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153 ├── a.txt
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154 └── b
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155 ├── c.txt
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156 └── d
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157 └── e.txt
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158
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159 >>> data = io.BytesIO()
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160 >>> zf = zipfile.ZipFile(data, 'w')
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161 >>> zf.writestr('a.txt', 'content of a')
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162 >>> zf.writestr('b/c.txt', 'content of c')
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163 >>> zf.writestr('b/d/e.txt', 'content of e')
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164 >>> zf.filename = 'abcde.zip'
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165
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166 Path accepts the zipfile object itself or a filename
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167
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168 >>> root = Path(zf)
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169
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170 From there, several path operations are available.
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171
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172 Directory iteration (including the zip file itself):
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173
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174 >>> a, b = root.iterdir()
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175 >>> a
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176 Path('abcde.zip', 'a.txt')
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177 >>> b
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178 Path('abcde.zip', 'b/')
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179
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180 name property:
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181
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182 >>> b.name
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183 'b'
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184
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185 join with divide operator:
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186
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187 >>> c = b / 'c.txt'
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188 >>> c
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189 Path('abcde.zip', 'b/c.txt')
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190 >>> c.name
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191 'c.txt'
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192
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193 Read text:
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194
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195 >>> c.read_text()
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196 'content of c'
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197
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198 existence:
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199
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200 >>> c.exists()
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201 True
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202 >>> (b / 'missing.txt').exists()
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203 False
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204
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205 Coercion to string:
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206
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207 >>> str(c)
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208 'abcde.zip/b/c.txt'
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209 """
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210
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211 __repr = "{self.__class__.__name__}({self.root.filename!r}, {self.at!r})"
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212
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213 def __init__(self, root, at=""):
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214 self.root = FastLookup.make(root)
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215 self.at = at
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216
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217 def open(self, mode='r', *args, pwd=None, **kwargs):
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218 """
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219 Open this entry as text or binary following the semantics
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220 of ``pathlib.Path.open()`` by passing arguments through
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221 to io.TextIOWrapper().
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222 """
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223 if self.is_dir():
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224 raise IsADirectoryError(self)
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225 zip_mode = mode[0]
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226 if not self.exists() and zip_mode == 'r':
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227 raise FileNotFoundError(self)
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228 stream = self.root.open(self.at, zip_mode, pwd=pwd)
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229 if 'b' in mode:
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230 if args or kwargs:
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231 raise ValueError("encoding args invalid for binary operation")
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232 return stream
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233 return io.TextIOWrapper(stream, *args, **kwargs)
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234
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235 @property
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236 def name(self):
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237 return posixpath.basename(self.at.rstrip("/"))
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238
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239 def read_text(self, *args, **kwargs):
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240 with self.open('r', *args, **kwargs) as strm:
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241 return strm.read()
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242
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243 def read_bytes(self):
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244 with self.open('rb') as strm:
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245 return strm.read()
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246
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247 def _is_child(self, path):
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248 return posixpath.dirname(path.at.rstrip("/")) == self.at.rstrip("/")
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249
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250 def _next(self, at):
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251 return Path(self.root, at)
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252
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253 def is_dir(self):
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254 return not self.at or self.at.endswith("/")
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255
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256 def is_file(self):
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257 return not self.is_dir()
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258
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259 def exists(self):
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260 return self.at in self.root._name_set()
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261
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262 def iterdir(self):
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263 if not self.is_dir():
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264 raise ValueError("Can't listdir a file")
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265 subs = map(self._next, self.root.namelist())
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266 return filter(self._is_child, subs)
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267
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268 def __str__(self):
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269 return posixpath.join(self.root.filename, self.at)
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270
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271 def __repr__(self):
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272 return self.__repr.format(self=self)
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273
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274 def joinpath(self, add):
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275 next = posixpath.join(self.at, _pathlib_compat(add))
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276 return self._next(self.root.resolve_dir(next))
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277
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278 __truediv__ = joinpath
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279
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280 @property
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281 def parent(self):
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282 parent_at = posixpath.dirname(self.at.rstrip('/'))
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283 if parent_at:
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284 parent_at += '/'
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285 return self._next(parent_at)