Mercurial > cpython-lru_cache-weakref

annotate Lib/_weakrefset.py @ 60008:0dfd62076ded

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Blocked revisions 79402,79406 via svnmerge ........ r79402 | benjamin.peterson | 2010-03-24 20:03:51 -0500 (Wed, 24 Mar 2010) | 1 line set bsddb eol style ........ r79406 | benjamin.peterson | 2010-03-24 20:05:57 -0500 (Wed, 24 Mar 2010) | 1 line fix eol properties on capsule files ........
author Benjamin Peterson <benjamin@python.org>
date Thu, 25 Mar 2010 01:11:10 +0000
parents 84caac71d79b
children 76854e45c465
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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e6069b24031e Moved WeakSet into a bootstap module use by abc.py.
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1 # Access WeakSet through the weakref module.
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2 # This code is separated-out because it is needed
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3 # by abc.py to load everything else at startup.
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4
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5 from _weakref import ref
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6
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7 __all__ = ['WeakSet']
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8
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9
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10 class _IterationGuard:
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11 # This context manager registers itself in the current iterators of the
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12 # weak container, such as to delay all removals until the context manager
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13 # exits.
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14 # This technique should be relatively thread-safe (since sets are).
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15
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16 def __init__(self, weakcontainer):
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17 # Don't create cycles
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18 self.weakcontainer = ref(weakcontainer)
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19
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20 def __enter__(self):
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21 w = self.weakcontainer()
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22 if w is not None:
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23 w._iterating.add(self)
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24 return self
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25
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26 def __exit__(self, e, t, b):
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27 w = self.weakcontainer()
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28 if w is not None:
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29 s = w._iterating
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30 s.remove(self)
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31 if not s:
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32 w._commit_removals()
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33
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34
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35 class WeakSet:
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36 def __init__(self, data=None):
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37 self.data = set()
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38 def _remove(item, selfref=ref(self)):
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39 self = selfref()
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40 if self is not None:
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41 if self._iterating:
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42 self._pending_removals.append(item)
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43 else:
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44 self.data.discard(item)
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45 self._remove = _remove
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46 # A list of keys to be removed
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47 self._pending_removals = []
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48 self._iterating = set()
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49 if data is not None:
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50 self.update(data)
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51
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52 def _commit_removals(self):
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53 l = self._pending_removals
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54 discard = self.data.discard
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55 while l:
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56 discard(l.pop())
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57
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58 def __iter__(self):
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59 with _IterationGuard(self):
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60 for itemref in self.data:
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61 item = itemref()
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62 if item is not None:
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63 yield item
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64
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65 def __len__(self):
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66 return sum(x() is not None for x in self.data)
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67
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68 def __contains__(self, item):
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69 return ref(item) in self.data
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70
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71 def __reduce__(self):
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72 return (self.__class__, (list(self),),
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73 getattr(self, '__dict__', None))
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74
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75 def add(self, item):
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76 if self._pending_removals:
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77 self._commit_removals()
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78 self.data.add(ref(item, self._remove))
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79
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80 def clear(self):
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81 if self._pending_removals:
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82 self._commit_removals()
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83 self.data.clear()
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84
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85 def copy(self):
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86 return self.__class__(self)
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87
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88 def pop(self):
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89 if self._pending_removals:
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90 self._commit_removals()
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91 while True:
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92 try:
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93 itemref = self.data.pop()
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94 except KeyError:
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95 raise KeyError('pop from empty WeakSet')
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96 item = itemref()
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97 if item is not None:
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98 return item
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99
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100 def remove(self, item):
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101 if self._pending_removals:
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102 self._commit_removals()
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103 self.data.remove(ref(item))
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104
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105 def discard(self, item):
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106 if self._pending_removals:
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107 self._commit_removals()
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108 self.data.discard(ref(item))
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109
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110 def update(self, other):
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111 if self._pending_removals:
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112 self._commit_removals()
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113 if isinstance(other, self.__class__):
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114 self.data.update(other.data)
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115 else:
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116 for element in other:
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117 self.add(element)
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118
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119 def __ior__(self, other):
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120 self.update(other)
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121 return self
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122
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123 # Helper functions for simple delegating methods.
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124 def _apply(self, other, method):
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125 if not isinstance(other, self.__class__):
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126 other = self.__class__(other)
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127 newdata = method(other.data)
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128 newset = self.__class__()
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129 newset.data = newdata
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130 return newset
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131
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132 def difference(self, other):
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133 return self._apply(other, self.data.difference)
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134 __sub__ = difference
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135
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136 def difference_update(self, other):
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137 if self._pending_removals:
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138 self._commit_removals()
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139 if self is other:
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140 self.data.clear()
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141 else:
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142 self.data.difference_update(ref(item) for item in other)
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143 def __isub__(self, other):
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144 if self._pending_removals:
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145 self._commit_removals()
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146 if self is other:
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147 self.data.clear()
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148 else:
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149 self.data.difference_update(ref(item) for item in other)
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150 return self
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151
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152 def intersection(self, other):
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153 return self._apply(other, self.data.intersection)
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154 __and__ = intersection
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155
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156 def intersection_update(self, other):
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157 if self._pending_removals:
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158 self._commit_removals()
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159 self.data.intersection_update(ref(item) for item in other)
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160 def __iand__(self, other):
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161 if self._pending_removals:
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162 self._commit_removals()
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163 self.data.intersection_update(ref(item) for item in other)
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164 return self
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165
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166 def issubset(self, other):
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167 return self.data.issubset(ref(item) for item in other)
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168 __lt__ = issubset
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169
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170 def __le__(self, other):
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171 return self.data <= set(ref(item) for item in other)
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172
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173 def issuperset(self, other):
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174 return self.data.issuperset(ref(item) for item in other)
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175 __gt__ = issuperset
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176
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177 def __ge__(self, other):
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178 return self.data >= set(ref(item) for item in other)
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179
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180 def __eq__(self, other):
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181 if not isinstance(other, self.__class__):
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182 return NotImplemented
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183 return self.data == set(ref(item) for item in other)
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184
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185 def symmetric_difference(self, other):
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186 return self._apply(other, self.data.symmetric_difference)
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187 __xor__ = symmetric_difference
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188
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189 def symmetric_difference_update(self, other):
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190 if self._pending_removals:
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191 self._commit_removals()
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192 if self is other:
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193 self.data.clear()
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194 else:
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195 self.data.symmetric_difference_update(ref(item) for item in other)
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196 def __ixor__(self, other):
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197 if self._pending_removals:
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198 self._commit_removals()
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199 if self is other:
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200 self.data.clear()
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201 else:
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202 self.data.symmetric_difference_update(ref(item) for item in other)
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203 return self
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204
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205 def union(self, other):
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206 return self._apply(other, self.data.union)
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207 __or__ = union
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208
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209 def isdisjoint(self, other):
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210 return len(self.intersection(other)) == 0