Mercurial > cpython-lru_cache-weakref

annotate Lib/_weakrefset.py @ 49961:e793fc3c8abe

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More 3.0 -> 3.1 transistion in the Windows and OS/2 build files
author Christian Heimes <christian@cheimes.de>
date Thu, 04 Dec 2008 14:27:25 +0000
parents 37499287f758
children a7ad1696866b
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 class WeakSet:
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10 def __init__(self, data=None):
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11 self.data = set()
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12 def _remove(item, selfref=ref(self)):
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13 self = selfref()
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14 if self is not None:
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15 self.data.discard(item)
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16 self._remove = _remove
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17 if data is not None:
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18 self.update(data)
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19
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20 def __iter__(self):
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21 for itemref in self.data:
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22 item = itemref()
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23 if item is not None:
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24 yield item
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25
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26 def __len__(self):
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27 return sum(x() is not None for x in self.data)
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28
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29 def __contains__(self, item):
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30 return ref(item) in self.data
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31
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32 def __reduce__(self):
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33 return (self.__class__, (list(self),),
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34 getattr(self, '__dict__', None))
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35
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36 def add(self, item):
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37 self.data.add(ref(item, self._remove))
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38
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39 def clear(self):
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40 self.data.clear()
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41
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42 def copy(self):
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43 return self.__class__(self)
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44
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45 def pop(self):
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46 while True:
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47 try:
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48 itemref = self.data.pop()
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49 except KeyError:
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50 raise KeyError('pop from empty WeakSet')
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51 item = itemref()
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52 if item is not None:
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53 return item
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54
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55 def remove(self, item):
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56 self.data.remove(ref(item))
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57
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58 def discard(self, item):
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59 self.data.discard(ref(item))
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60
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61 def update(self, other):
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62 if isinstance(other, self.__class__):
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63 self.data.update(other.data)
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64 else:
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65 for element in other:
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66 self.add(element)
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67 def __ior__(self, other):
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68 self.update(other)
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69 return self
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70
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71 # Helper functions for simple delegating methods.
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72 def _apply(self, other, method):
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73 if not isinstance(other, self.__class__):
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74 other = self.__class__(other)
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75 newdata = method(other.data)
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76 newset = self.__class__()
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77 newset.data = newdata
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78 return newset
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79
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80 def difference(self, other):
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81 return self._apply(other, self.data.difference)
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82 __sub__ = difference
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83
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84 def difference_update(self, other):
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85 if self is other:
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86 self.data.clear()
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87 else:
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88 self.data.difference_update(ref(item) for item in other)
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89 def __isub__(self, other):
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90 if self is other:
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91 self.data.clear()
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92 else:
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93 self.data.difference_update(ref(item) for item in other)
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94 return self
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95
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96 def intersection(self, other):
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97 return self._apply(other, self.data.intersection)
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98 __and__ = intersection
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99
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100 def intersection_update(self, other):
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101 self.data.intersection_update(ref(item) for item in other)
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102 def __iand__(self, other):
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103 self.data.intersection_update(ref(item) for item in other)
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104 return self
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105
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106 def issubset(self, other):
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107 return self.data.issubset(ref(item) for item in other)
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108 __lt__ = issubset
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109
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110 def __le__(self, other):
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111 return self.data <= set(ref(item) for item in other)
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112
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113 def issuperset(self, other):
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114 return self.data.issuperset(ref(item) for item in other)
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115 __gt__ = issuperset
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116
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117 def __ge__(self, other):
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118 return self.data >= set(ref(item) for item in other)
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119
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120 def __eq__(self, other):
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121 return self.data == set(ref(item) for item in other)
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122
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123 def symmetric_difference(self, other):
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124 return self._apply(other, self.data.symmetric_difference)
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125 __xor__ = symmetric_difference
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126
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127 def symmetric_difference_update(self, other):
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128 if self is other:
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129 self.data.clear()
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130 else:
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131 self.data.symmetric_difference_update(ref(item) for item in other)
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132 def __ixor__(self, other):
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133 if self is other:
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134 self.data.clear()
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135 else:
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136 self.data.symmetric_difference_update(ref(item) for item in other)
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137 return self
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138
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139 def union(self, other):
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140 return self._apply(other, self.data.union)
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141 __or__ = union
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142
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143 def isdisjoint(self, other):
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144 return len(self.intersection(other)) == 0