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annotate babel/util.py @ 527:5e1804d27d65

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Cleanup round #1: get rid of the frozenset/set utility code and imports. This is no longer needed with 2.4 and onward.
author jruigrok
date Sat, 05 Mar 2011 14:59:20 +0000
parents f03cc3bed4e1
children 5b62a9699780
rev   line source
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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2007 Edgewall Software
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4 # All rights reserved.
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5 #
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6 # This software is licensed as described in the file COPYING, which
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7 # you should have received as part of this distribution. The terms
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8 # are also available at http://babel.edgewall.org/wiki/License.
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9 #
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10 # This software consists of voluntary contributions made by many
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11 # individuals. For the exact contribution history, see the revision
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12 # history and logs, available at http://babel.edgewall.org/log/.
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13
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14 """Various utility classes and functions."""
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15
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16 import codecs
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17 from datetime import timedelta, tzinfo
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18 import os
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19 import re
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20 import textwrap
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21 import time
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22 from itertools import izip, imap
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23 try:
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24 from operator import itemgetter
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25 except ImportError:
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26 def itemgetter(item):
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27 return lambda obj: obj[item]
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28
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29 missing = object()
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30
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31 __all__ = ['distinct', 'pathmatch', 'relpath', 'wraptext', 'odict', 'UTC',
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32 'LOCALTZ']
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33 __docformat__ = 'restructuredtext en'
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34
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35
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36 def distinct(iterable):
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37 """Yield all items in an iterable collection that are distinct.
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38
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39 Unlike when using sets for a similar effect, the original ordering of the
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40 items in the collection is preserved by this function.
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41
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42 >>> print list(distinct([1, 2, 1, 3, 4, 4]))
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43 [1, 2, 3, 4]
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44 >>> print list(distinct('foobar'))
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45 ['f', 'o', 'b', 'a', 'r']
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46
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47 :param iterable: the iterable collection providing the data
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48 :return: the distinct items in the collection
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49 :rtype: ``iterator``
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50 """
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51 seen = set()
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52 for item in iter(iterable):
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53 if item not in seen:
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54 yield item
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55 seen.add(item)
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56
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57 # Regexp to match python magic encoding line
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58 PYTHON_MAGIC_COMMENT_re = re.compile(
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59 r'[ \t\f]* \# .* coding[=:][ \t]*([-\w.]+)', re.VERBOSE)
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60 def parse_encoding(fp):
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61 """Deduce the encoding of a source file from magic comment.
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62
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63 It does this in the same way as the `Python interpreter`__
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64
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65 .. __: http://docs.python.org/ref/encodings.html
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66
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67 The ``fp`` argument should be a seekable file object.
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68
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69 (From Jeff Dairiki)
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70 """
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71 pos = fp.tell()
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72 fp.seek(0)
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73 try:
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74 line1 = fp.readline()
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75 has_bom = line1.startswith(codecs.BOM_UTF8)
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76 if has_bom:
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77 line1 = line1[len(codecs.BOM_UTF8):]
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78
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79 m = PYTHON_MAGIC_COMMENT_re.match(line1)
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80 if not m:
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81 try:
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82 import parser
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83 parser.suite(line1)
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84 except (ImportError, SyntaxError):
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85 # Either it's a real syntax error, in which case the source is
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86 # not valid python source, or line2 is a continuation of line1,
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87 # in which case we don't want to scan line2 for a magic
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88 # comment.
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89 pass
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90 else:
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91 line2 = fp.readline()
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92 m = PYTHON_MAGIC_COMMENT_re.match(line2)
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93
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94 if has_bom:
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95 if m:
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96 raise SyntaxError(
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97 "python refuses to compile code with both a UTF8 "
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98 "byte-order-mark and a magic encoding comment")
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99 return 'utf_8'
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100 elif m:
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101 return m.group(1)
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102 else:
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103 return None
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104 finally:
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105 fp.seek(pos)
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106
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107 def pathmatch(pattern, filename):
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108 """Extended pathname pattern matching.
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109
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110 This function is similar to what is provided by the ``fnmatch`` module in
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111 the Python standard library, but:
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112
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113 * can match complete (relative or absolute) path names, and not just file
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114 names, and
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115 * also supports a convenience pattern ("**") to match files at any
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116 directory level.
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117
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118 Examples:
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119
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120 >>> pathmatch('**.py', 'bar.py')
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121 True
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122 >>> pathmatch('**.py', 'foo/bar/baz.py')
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123 True
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124 >>> pathmatch('**.py', 'templates/index.html')
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125 False
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126
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127 >>> pathmatch('**/templates/*.html', 'templates/index.html')
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128 True
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129 >>> pathmatch('**/templates/*.html', 'templates/foo/bar.html')
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130 False
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131
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132 :param pattern: the glob pattern
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133 :param filename: the path name of the file to match against
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134 :return: `True` if the path name matches the pattern, `False` otherwise
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135 :rtype: `bool`
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136 """
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137 symbols = {
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138 '?': '[^/]',
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139 '?/': '[^/]/',
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140 '*': '[^/]+',
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141 '*/': '[^/]+/',
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142 '**/': '(?:.+/)*?',
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143 '**': '(?:.+/)*?[^/]+',
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144 }
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145 buf = []
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146 for idx, part in enumerate(re.split('([?*]+/?)', pattern)):
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147 if idx % 2:
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148 buf.append(symbols[part])
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149 elif part:
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150 buf.append(re.escape(part))
136
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151 match = re.match(''.join(buf) + '$', filename.replace(os.sep, '/'))
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152 return match is not None
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153
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154
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155 class TextWrapper(textwrap.TextWrapper):
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156 wordsep_re = re.compile(
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157 r'(\s+|' # any whitespace
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158 r'(?<=[\w\!\"\'\&\.\,\?])-{2,}(?=\w))' # em-dash
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159 )
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160
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161
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162 def wraptext(text, width=70, initial_indent='', subsequent_indent=''):
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163 """Simple wrapper around the ``textwrap.wrap`` function in the standard
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164 library. This version does not wrap lines on hyphens in words.
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165
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166 :param text: the text to wrap
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167 :param width: the maximum line width
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168 :param initial_indent: string that will be prepended to the first line of
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169 wrapped output
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170 :param subsequent_indent: string that will be prepended to all lines save
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171 the first of wrapped output
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172 :return: a list of lines
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173 :rtype: `list`
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174 """
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175 wrapper = TextWrapper(width=width, initial_indent=initial_indent,
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176 subsequent_indent=subsequent_indent,
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177 break_long_words=False)
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178 return wrapper.wrap(text)
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179
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180
58
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181 class odict(dict):
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182 """Ordered dict implementation.
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183
229
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184 :see: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/107747
58
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185 """
64
7eb6fea17864 The order of extraction methods is now preserved (see #10).
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186 def __init__(self, data=None):
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187 dict.__init__(self, data or {})
165
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188 self._keys = dict.keys(self)
58
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189
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190 def __delitem__(self, key):
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191 dict.__delitem__(self, key)
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192 self._keys.remove(key)
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193
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194 def __setitem__(self, key, item):
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195 dict.__setitem__(self, key, item)
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196 if key not in self._keys:
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197 self._keys.append(key)
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198
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199 def __iter__(self):
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200 return iter(self._keys)
339
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201 iterkeys = __iter__
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202
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203 def clear(self):
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204 dict.clear(self)
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205 self._keys = []
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206
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207 def copy(self):
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208 d = odict()
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209 d.update(self)
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210 return d
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211
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212 def items(self):
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213 return zip(self._keys, self.values())
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214
339
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215 def iteritems(self):
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216 return izip(self._keys, self.itervalues())
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217
58
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218 def keys(self):
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219 return self._keys[:]
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220
339
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221 def pop(self, key, default=missing):
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222 if default is missing:
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223 return dict.pop(self, key)
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224 elif key not in self:
167
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225 return default
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226 self._keys.remove(key)
339
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227 return dict.pop(self, key, default)
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228
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229 def popitem(self, key):
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230 self._keys.remove(key)
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231 return dict.popitem(key)
167
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232
58
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233 def setdefault(self, key, failobj = None):
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234 dict.setdefault(self, key, failobj)
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235 if key not in self._keys:
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236 self._keys.append(key)
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237
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238 def update(self, dict):
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239 for (key, val) in dict.items():
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240 self[key] = val
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241
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242 def values(self):
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243 return map(self.get, self._keys)
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244
339
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245 def itervalues(self):
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246 return imap(self.get, self._keys)
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247
58
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248
3
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249 try:
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250 relpath = os.path.relpath
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251 except AttributeError:
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252 def relpath(path, start='.'):
31
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253 """Compute the relative path to one path from another.
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254
132
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255 >>> relpath('foo/bar.txt', '').replace(os.sep, '/')
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256 'foo/bar.txt'
132
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257 >>> relpath('foo/bar.txt', 'foo').replace(os.sep, '/')
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258 'bar.txt'
132
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259 >>> relpath('foo/bar.txt', 'baz').replace(os.sep, '/')
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260 '../foo/bar.txt'
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261
31
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262 :return: the relative path
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263 :rtype: `basestring`
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264 """
3
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265 start_list = os.path.abspath(start).split(os.sep)
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266 path_list = os.path.abspath(path).split(os.sep)
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267
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268 # Work out how much of the filepath is shared by start and path.
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269 i = len(os.path.commonprefix([start_list, path_list]))
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270
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271 rel_list = [os.path.pardir] * (len(start_list) - i) + path_list[i:]
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272 return os.path.join(*rel_list)
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273
108
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274 ZERO = timedelta(0)
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275
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276
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277 class FixedOffsetTimezone(tzinfo):
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278 """Fixed offset in minutes east from UTC."""
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279
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280 def __init__(self, offset, name=None):
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281 self._offset = timedelta(minutes=offset)
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282 if name is None:
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283 name = 'Etc/GMT+%d' % offset
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284 self.zone = name
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285
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286 def __str__(self):
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287 return self.zone
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288
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289 def __repr__(self):
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290 return '<FixedOffset "%s" %s>' % (self.zone, self._offset)
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291
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292 def utcoffset(self, dt):
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293 return self._offset
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294
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295 def tzname(self, dt):
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296 return self.zone
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297
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298 def dst(self, dt):
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299 return ZERO
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300
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301
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302 try:
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303 from pytz import UTC
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304 except ImportError:
108
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305 UTC = FixedOffsetTimezone(0, 'UTC')
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306 """`tzinfo` object for UTC (Universal Time).
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307
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308 :type: `tzinfo`
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309 """
97
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310
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311 STDOFFSET = timedelta(seconds = -time.timezone)
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312 if time.daylight:
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313 DSTOFFSET = timedelta(seconds = -time.altzone)
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314 else:
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315 DSTOFFSET = STDOFFSET
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316
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317 DSTDIFF = DSTOFFSET - STDOFFSET
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318
108
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319
97
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320 class LocalTimezone(tzinfo):
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321
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322 def utcoffset(self, dt):
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323 if self._isdst(dt):
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324 return DSTOFFSET
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325 else:
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326 return STDOFFSET
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327
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328 def dst(self, dt):
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329 if self._isdst(dt):
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330 return DSTDIFF
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331 else:
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332 return ZERO
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333
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334 def tzname(self, dt):
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335 return time.tzname[self._isdst(dt)]
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336
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337 def _isdst(self, dt):
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338 tt = (dt.year, dt.month, dt.day,
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339 dt.hour, dt.minute, dt.second,
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340 dt.weekday(), 0, -1)
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341 stamp = time.mktime(tt)
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342 tt = time.localtime(stamp)
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343 return tt.tm_isdst > 0
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344
108
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345
99
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346 LOCALTZ = LocalTimezone()
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347 """`tzinfo` object for local time-zone.
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348
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349 :type: `tzinfo`
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350 """
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