Mercurial > repos > yating-l > jbrowsearchivecreator

annotate test/lib/python2.7/_weakrefset.py @ 3:7d1a9a91b989 draft

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planemo upload for repository https://github.com/Yating-L/jbrowse-archive-creator.git commit d583ac16a6c6942730ea536eb59cc37941816030-dirty
author yating-l
date Thu, 18 May 2017 18:37:28 -0400
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3
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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(object):
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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(object):
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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 # Caveat: the iterator will keep a strong reference to
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64 # `item` until it is resumed or closed.
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65 yield item
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66
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67 def __len__(self):
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68 return len(self.data) - len(self._pending_removals)
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69
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70 def __contains__(self, item):
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71 try:
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72 wr = ref(item)
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73 except TypeError:
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74 return False
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75 return wr in self.data
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76
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77 def __reduce__(self):
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78 return (self.__class__, (list(self),),
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79 getattr(self, '__dict__', None))
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80
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81 __hash__ = None
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82
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83 def add(self, item):
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84 if self._pending_removals:
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85 self._commit_removals()
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86 self.data.add(ref(item, self._remove))
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87
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88 def clear(self):
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89 if self._pending_removals:
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90 self._commit_removals()
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91 self.data.clear()
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92
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93 def copy(self):
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94 return self.__class__(self)
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95
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96 def pop(self):
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97 if self._pending_removals:
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98 self._commit_removals()
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99 while True:
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diff changeset
100 try:
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101 itemref = self.data.pop()
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102 except KeyError:
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103 raise KeyError('pop from empty WeakSet')
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104 item = itemref()
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105 if item is not None:
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106 return item
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107
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108 def remove(self, item):
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109 if self._pending_removals:
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110 self._commit_removals()
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111 self.data.remove(ref(item))
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112
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113 def discard(self, item):
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114 if self._pending_removals:
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115 self._commit_removals()
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116 self.data.discard(ref(item))
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117
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118 def update(self, other):
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119 if self._pending_removals:
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120 self._commit_removals()
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121 for element in other:
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122 self.add(element)
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123
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124 def __ior__(self, other):
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125 self.update(other)
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126 return self
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127
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128 def difference(self, other):
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129 newset = self.copy()
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130 newset.difference_update(other)
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131 return newset
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132 __sub__ = difference
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133
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134 def difference_update(self, other):
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135 self.__isub__(other)
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diff changeset
136 def __isub__(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 return self
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144
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145 def intersection(self, other):
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146 return self.__class__(item for item in other if item in self)
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147 __and__ = intersection
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148
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149 def intersection_update(self, other):
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diff changeset
150 self.__iand__(other)
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151 def __iand__(self, other):
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152 if self._pending_removals:
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153 self._commit_removals()
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154 self.data.intersection_update(ref(item) for item in other)
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155 return self
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diff changeset
156
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157 def issubset(self, other):
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158 return self.data.issubset(ref(item) for item in other)
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159 __le__ = issubset
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160
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161 def __lt__(self, other):
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162 return self.data < set(ref(item) for item in other)
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163
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164 def issuperset(self, other):
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165 return self.data.issuperset(ref(item) for item in other)
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166 __ge__ = issuperset
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167
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168 def __gt__(self, other):
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169 return self.data > set(ref(item) for item in other)
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170
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171 def __eq__(self, other):
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172 if not isinstance(other, self.__class__):
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173 return NotImplemented
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174 return self.data == set(ref(item) for item in other)
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175
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176 def __ne__(self, other):
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177 opposite = self.__eq__(other)
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178 if opposite is NotImplemented:
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179 return NotImplemented
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180 return not opposite
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181
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182 def symmetric_difference(self, other):
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183 newset = self.copy()
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184 newset.symmetric_difference_update(other)
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185 return newset
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186 __xor__ = symmetric_difference
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187
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188 def symmetric_difference_update(self, other):
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189 self.__ixor__(other)
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190 def __ixor__(self, other):
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191 if self._pending_removals:
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192 self._commit_removals()
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193 if self is other:
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194 self.data.clear()
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195 else:
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196 self.data.symmetric_difference_update(ref(item, self._remove) for item in other)
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197 return self
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198
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199 def union(self, other):
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200 return self.__class__(e for s in (self, other) for e in s)
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201 __or__ = union
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202
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203 def isdisjoint(self, other):
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204 return len(self.intersection(other)) == 0