Backport of weakref.WeakSet and tests from Python 3.
This commit is contained in:
Michael Foord
parent
b8d688cd7c
commit
e6410c536c
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@ -209,6 +209,14 @@ methods of :class:`WeakKeyDictionary` objects.
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.. versionadded:: 2.5
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.. class:: WeakSet([elements])
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Set class that keeps weak references to its elements. An element will be
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discarded when no strong reference to it exists any more.
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.. versionadded:: 2.7
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.. data:: ReferenceType
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The type object for weak references objects.
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@ -0,0 +1,212 @@
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# Access WeakSet through the weakref module.
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# This code is separated-out because it is needed
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# by abc.py to load everything else at startup.
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from _weakref import ref
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__all__ = ['WeakSet']
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class _IterationGuard(object):
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# This context manager registers itself in the current iterators of the
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# weak container, such as to delay all removals until the context manager
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# exits.
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# This technique should be relatively thread-safe (since sets are).
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def __init__(self, weakcontainer):
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# Don't create cycles
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self.weakcontainer = ref(weakcontainer)
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def __enter__(self):
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w = self.weakcontainer()
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if w is not None:
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w._iterating.add(self)
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return self
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def __exit__(self, e, t, b):
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w = self.weakcontainer()
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if w is not None:
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s = w._iterating
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s.remove(self)
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if not s:
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w._commit_removals()
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class WeakSet(object):
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def __init__(self, data=None):
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self.data = set()
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def _remove(item, selfref=ref(self)):
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self = selfref()
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if self is not None:
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if self._iterating:
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self._pending_removals.append(item)
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else:
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self.data.discard(item)
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self._remove = _remove
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# A list of keys to be removed
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self._pending_removals = []
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self._iterating = set()
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if data is not None:
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self.update(data)
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def _commit_removals(self):
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l = self._pending_removals
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discard = self.data.discard
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while l:
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discard(l.pop())
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def __iter__(self):
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with _IterationGuard(self):
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for itemref in self.data:
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item = itemref()
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if item is not None:
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yield item
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def __len__(self):
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return sum(x() is not None for x in self.data)
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def __contains__(self, item):
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return ref(item) in self.data
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def __reduce__(self):
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return (self.__class__, (list(self),),
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getattr(self, '__dict__', None))
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__hash__ = None
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def add(self, item):
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if self._pending_removals:
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self._commit_removals()
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self.data.add(ref(item, self._remove))
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def clear(self):
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if self._pending_removals:
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self._commit_removals()
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self.data.clear()
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def copy(self):
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return self.__class__(self)
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def pop(self):
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if self._pending_removals:
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self._commit_removals()
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while True:
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try:
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itemref = self.data.pop()
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except KeyError:
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raise KeyError('pop from empty WeakSet')
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item = itemref()
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if item is not None:
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return item
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def remove(self, item):
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if self._pending_removals:
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self._commit_removals()
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self.data.remove(ref(item))
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def discard(self, item):
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if self._pending_removals:
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self._commit_removals()
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self.data.discard(ref(item))
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def update(self, other):
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if self._pending_removals:
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self._commit_removals()
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if isinstance(other, self.__class__):
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self.data.update(other.data)
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else:
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for element in other:
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self.add(element)
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def __ior__(self, other):
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self.update(other)
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return self
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# Helper functions for simple delegating methods.
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def _apply(self, other, method):
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if not isinstance(other, self.__class__):
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other = self.__class__(other)
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newdata = method(other.data)
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newset = self.__class__()
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newset.data = newdata
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return newset
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def difference(self, other):
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return self._apply(other, self.data.difference)
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__sub__ = difference
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def difference_update(self, other):
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if self._pending_removals:
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self._commit_removals()
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if self is other:
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self.data.clear()
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else:
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self.data.difference_update(ref(item) for item in other)
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def __isub__(self, other):
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if self._pending_removals:
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self._commit_removals()
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if self is other:
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self.data.clear()
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else:
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self.data.difference_update(ref(item) for item in other)
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return self
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def intersection(self, other):
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return self._apply(other, self.data.intersection)
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__and__ = intersection
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def intersection_update(self, other):
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if self._pending_removals:
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self._commit_removals()
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self.data.intersection_update(ref(item) for item in other)
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def __iand__(self, other):
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if self._pending_removals:
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self._commit_removals()
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self.data.intersection_update(ref(item) for item in other)
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return self
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def issubset(self, other):
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return self.data.issubset(ref(item) for item in other)
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__lt__ = issubset
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def __le__(self, other):
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return self.data <= set(ref(item) for item in other)
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def issuperset(self, other):
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return self.data.issuperset(ref(item) for item in other)
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__gt__ = issuperset
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def __ge__(self, other):
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return self.data >= set(ref(item) for item in other)
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def __eq__(self, other):
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if not isinstance(other, self.__class__):
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return NotImplemented
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return self.data == set(ref(item) for item in other)
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def symmetric_difference(self, other):
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return self._apply(other, self.data.symmetric_difference)
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__xor__ = symmetric_difference
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def symmetric_difference_update(self, other):
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if self._pending_removals:
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self._commit_removals()
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if self is other:
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self.data.clear()
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else:
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self.data.symmetric_difference_update(ref(item) for item in other)
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def __ixor__(self, other):
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if self._pending_removals:
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self._commit_removals()
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if self is other:
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self.data.clear()
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else:
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self.data.symmetric_difference_update(ref(item) for item in other)
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return self
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def union(self, other):
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return self._apply(other, self.data.union)
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__or__ = union
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def isdisjoint(self, other):
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return len(self.intersection(other)) == 0
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@ -0,0 +1,376 @@
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import unittest
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from test import test_support
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from weakref import proxy, ref, WeakSet
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import operator
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import copy
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import string
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import os
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from random import randrange, shuffle
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import sys
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import warnings
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import collections
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import gc
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import contextlib
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class Foo:
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pass
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class SomeClass(object):
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def __init__(self, value):
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self.value = value
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def __eq__(self, other):
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if type(other) != type(self):
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return False
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return other.value == self.value
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def __ne__(self, other):
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return not self.__eq__(other)
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def __hash__(self):
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return hash((SomeClass, self.value))
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class TestWeakSet(unittest.TestCase):
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def setUp(self):
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# need to keep references to them
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self.items = [SomeClass(c) for c in ('a', 'b', 'c')]
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self.items2 = [SomeClass(c) for c in ('x', 'y', 'z')]
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self.letters = [SomeClass(c) for c in string.ascii_letters]
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self.s = WeakSet(self.items)
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self.d = dict.fromkeys(self.items)
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self.obj = SomeClass('F')
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self.fs = WeakSet([self.obj])
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def test_methods(self):
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weaksetmethods = dir(WeakSet)
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for method in dir(set):
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if method == 'test_c_api' or method.startswith('_'):
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continue
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self.assertIn(method, weaksetmethods,
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"WeakSet missing method " + method)
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def test_new_or_init(self):
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self.assertRaises(TypeError, WeakSet, [], 2)
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def test_len(self):
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self.assertEqual(len(self.s), len(self.d))
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self.assertEqual(len(self.fs), 1)
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del self.obj
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self.assertEqual(len(self.fs), 0)
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def test_contains(self):
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for c in self.letters:
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self.assertEqual(c in self.s, c in self.d)
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self.assertRaises(TypeError, self.s.__contains__, [[]])
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self.assertIn(self.obj, self.fs)
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del self.obj
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self.assertNotIn(SomeClass('F'), self.fs)
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def test_union(self):
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u = self.s.union(self.items2)
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for c in self.letters:
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self.assertEqual(c in u, c in self.d or c in self.items2)
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self.assertEqual(self.s, WeakSet(self.items))
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self.assertEqual(type(u), WeakSet)
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self.assertRaises(TypeError, self.s.union, [[]])
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for C in set, frozenset, dict.fromkeys, list, tuple:
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x = WeakSet(self.items + self.items2)
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c = C(self.items2)
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self.assertEqual(self.s.union(c), x)
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def test_or(self):
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i = self.s.union(self.items2)
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self.assertEqual(self.s | set(self.items2), i)
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self.assertEqual(self.s | frozenset(self.items2), i)
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def test_intersection(self):
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i = self.s.intersection(self.items2)
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for c in self.letters:
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self.assertEqual(c in i, c in self.d and c in self.items2)
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self.assertEqual(self.s, WeakSet(self.items))
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self.assertEqual(type(i), WeakSet)
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for C in set, frozenset, dict.fromkeys, list, tuple:
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x = WeakSet([])
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self.assertEqual(self.s.intersection(C(self.items2)), x)
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def test_isdisjoint(self):
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self.assertTrue(self.s.isdisjoint(WeakSet(self.items2)))
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self.assertTrue(not self.s.isdisjoint(WeakSet(self.letters)))
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def test_and(self):
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i = self.s.intersection(self.items2)
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self.assertEqual(self.s & set(self.items2), i)
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self.assertEqual(self.s & frozenset(self.items2), i)
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def test_difference(self):
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i = self.s.difference(self.items2)
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for c in self.letters:
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self.assertEqual(c in i, c in self.d and c not in self.items2)
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self.assertEqual(self.s, WeakSet(self.items))
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self.assertEqual(type(i), WeakSet)
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self.assertRaises(TypeError, self.s.difference, [[]])
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def test_sub(self):
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i = self.s.difference(self.items2)
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self.assertEqual(self.s - set(self.items2), i)
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self.assertEqual(self.s - frozenset(self.items2), i)
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def test_symmetric_difference(self):
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i = self.s.symmetric_difference(self.items2)
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for c in self.letters:
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self.assertEqual(c in i, (c in self.d) ^ (c in self.items2))
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self.assertEqual(self.s, WeakSet(self.items))
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self.assertEqual(type(i), WeakSet)
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self.assertRaises(TypeError, self.s.symmetric_difference, [[]])
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def test_xor(self):
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i = self.s.symmetric_difference(self.items2)
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self.assertEqual(self.s ^ set(self.items2), i)
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self.assertEqual(self.s ^ frozenset(self.items2), i)
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def test_sub_and_super(self):
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pl, ql, rl = map(lambda s: [SomeClass(c) for c in s], ['ab', 'abcde', 'def'])
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p, q, r = map(WeakSet, (pl, ql, rl))
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self.assertTrue(p < q)
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self.assertTrue(p <= q)
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self.assertTrue(q <= q)
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self.assertTrue(q > p)
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self.assertTrue(q >= p)
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self.assertFalse(q < r)
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self.assertFalse(q <= r)
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self.assertFalse(q > r)
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self.assertFalse(q >= r)
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self.assertTrue(set('a').issubset('abc'))
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self.assertTrue(set('abc').issuperset('a'))
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self.assertFalse(set('a').issubset('cbs'))
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self.assertFalse(set('cbs').issuperset('a'))
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def test_gc(self):
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# Create a nest of cycles to exercise overall ref count check
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s = WeakSet(Foo() for i in range(1000))
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for elem in s:
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elem.cycle = s
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elem.sub = elem
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elem.set = WeakSet([elem])
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def test_subclass_with_custom_hash(self):
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# Bug #1257731
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class H(WeakSet):
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def __hash__(self):
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return int(id(self) & 0x7fffffff)
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s=H()
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f=set()
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f.add(s)
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self.assertIn(s, f)
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f.remove(s)
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f.add(s)
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f.discard(s)
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def test_init(self):
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s = WeakSet()
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s.__init__(self.items)
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self.assertEqual(s, self.s)
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s.__init__(self.items2)
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self.assertEqual(s, WeakSet(self.items2))
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self.assertRaises(TypeError, s.__init__, s, 2);
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self.assertRaises(TypeError, s.__init__, 1);
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def test_constructor_identity(self):
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s = WeakSet(self.items)
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t = WeakSet(s)
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self.assertNotEqual(id(s), id(t))
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def test_hash(self):
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self.assertRaises(TypeError, hash, self.s)
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def test_clear(self):
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self.s.clear()
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self.assertEqual(self.s, WeakSet([]))
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self.assertEqual(len(self.s), 0)
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def test_copy(self):
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dup = self.s.copy()
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self.assertEqual(self.s, dup)
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self.assertNotEqual(id(self.s), id(dup))
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def test_add(self):
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x = SomeClass('Q')
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self.s.add(x)
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self.assertIn(x, self.s)
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dup = self.s.copy()
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self.s.add(x)
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self.assertEqual(self.s, dup)
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self.assertRaises(TypeError, self.s.add, [])
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self.fs.add(Foo())
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self.assertTrue(len(self.fs) == 1)
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self.fs.add(self.obj)
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self.assertTrue(len(self.fs) == 1)
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def test_remove(self):
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x = SomeClass('a')
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self.s.remove(x)
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self.assertNotIn(x, self.s)
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self.assertRaises(KeyError, self.s.remove, x)
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self.assertRaises(TypeError, self.s.remove, [])
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def test_discard(self):
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a, q = SomeClass('a'), SomeClass('Q')
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self.s.discard(a)
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self.assertNotIn(a, self.s)
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self.s.discard(q)
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self.assertRaises(TypeError, self.s.discard, [])
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def test_pop(self):
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for i in range(len(self.s)):
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elem = self.s.pop()
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self.assertNotIn(elem, self.s)
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self.assertRaises(KeyError, self.s.pop)
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def test_update(self):
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retval = self.s.update(self.items2)
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self.assertEqual(retval, None)
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for c in (self.items + self.items2):
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self.assertIn(c, self.s)
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self.assertRaises(TypeError, self.s.update, [[]])
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def test_update_set(self):
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self.s.update(set(self.items2))
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for c in (self.items + self.items2):
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self.assertIn(c, self.s)
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def test_ior(self):
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self.s |= set(self.items2)
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for c in (self.items + self.items2):
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self.assertIn(c, self.s)
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def test_intersection_update(self):
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retval = self.s.intersection_update(self.items2)
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self.assertEqual(retval, None)
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for c in (self.items + self.items2):
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if c in self.items2 and c in self.items:
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self.assertIn(c, self.s)
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else:
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self.assertNotIn(c, self.s)
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self.assertRaises(TypeError, self.s.intersection_update, [[]])
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||||
|
||||
def test_iand(self):
|
||||
self.s &= set(self.items2)
|
||||
for c in (self.items + self.items2):
|
||||
if c in self.items2 and c in self.items:
|
||||
self.assertIn(c, self.s)
|
||||
else:
|
||||
self.assertNotIn(c, self.s)
|
||||
|
||||
def test_difference_update(self):
|
||||
retval = self.s.difference_update(self.items2)
|
||||
self.assertEqual(retval, None)
|
||||
for c in (self.items + self.items2):
|
||||
if c in self.items and c not in self.items2:
|
||||
self.assertIn(c, self.s)
|
||||
else:
|
||||
self.assertNotIn(c, self.s)
|
||||
self.assertRaises(TypeError, self.s.difference_update, [[]])
|
||||
self.assertRaises(TypeError, self.s.symmetric_difference_update, [[]])
|
||||
|
||||
def test_isub(self):
|
||||
self.s -= set(self.items2)
|
||||
for c in (self.items + self.items2):
|
||||
if c in self.items and c not in self.items2:
|
||||
self.assertIn(c, self.s)
|
||||
else:
|
||||
self.assertNotIn(c, self.s)
|
||||
|
||||
def test_symmetric_difference_update(self):
|
||||
retval = self.s.symmetric_difference_update(self.items2)
|
||||
self.assertEqual(retval, None)
|
||||
for c in (self.items + self.items2):
|
||||
if (c in self.items) ^ (c in self.items2):
|
||||
self.assertIn(c, self.s)
|
||||
else:
|
||||
self.assertNotIn(c, self.s)
|
||||
self.assertRaises(TypeError, self.s.symmetric_difference_update, [[]])
|
||||
|
||||
def test_ixor(self):
|
||||
self.s ^= set(self.items2)
|
||||
for c in (self.items + self.items2):
|
||||
if (c in self.items) ^ (c in self.items2):
|
||||
self.assertIn(c, self.s)
|
||||
else:
|
||||
self.assertNotIn(c, self.s)
|
||||
|
||||
def test_inplace_on_self(self):
|
||||
t = self.s.copy()
|
||||
t |= t
|
||||
self.assertEqual(t, self.s)
|
||||
t &= t
|
||||
self.assertEqual(t, self.s)
|
||||
t -= t
|
||||
self.assertEqual(t, WeakSet())
|
||||
t = self.s.copy()
|
||||
t ^= t
|
||||
self.assertEqual(t, WeakSet())
|
||||
|
||||
def test_eq(self):
|
||||
# issue 5964
|
||||
self.assertTrue(self.s == self.s)
|
||||
self.assertTrue(self.s == WeakSet(self.items))
|
||||
self.assertFalse(self.s == set(self.items))
|
||||
self.assertFalse(self.s == list(self.items))
|
||||
self.assertFalse(self.s == tuple(self.items))
|
||||
self.assertFalse(self.s == 1)
|
||||
|
||||
def test_weak_destroy_while_iterating(self):
|
||||
# Issue #7105: iterators shouldn't crash when a key is implicitly removed
|
||||
# Create new items to be sure no-one else holds a reference
|
||||
items = [SomeClass(c) for c in ('a', 'b', 'c')]
|
||||
s = WeakSet(items)
|
||||
it = iter(s)
|
||||
next(it) # Trigger internal iteration
|
||||
# Destroy an item
|
||||
del items[-1]
|
||||
gc.collect() # just in case
|
||||
# We have removed either the first consumed items, or another one
|
||||
self.assertIn(len(list(it)), [len(items), len(items) - 1])
|
||||
del it
|
||||
# The removal has been committed
|
||||
self.assertEqual(len(s), len(items))
|
||||
|
||||
def test_weak_destroy_and_mutate_while_iterating(self):
|
||||
# Issue #7105: iterators shouldn't crash when a key is implicitly removed
|
||||
items = [SomeClass(c) for c in string.ascii_letters]
|
||||
s = WeakSet(items)
|
||||
@contextlib.contextmanager
|
||||
def testcontext():
|
||||
try:
|
||||
it = iter(s)
|
||||
next(it)
|
||||
# Schedule an item for removal and recreate it
|
||||
u = SomeClass(str(items.pop()))
|
||||
gc.collect() # just in case
|
||||
yield u
|
||||
finally:
|
||||
it = None # should commit all removals
|
||||
|
||||
with testcontext() as u:
|
||||
self.assertNotIn(u, s)
|
||||
with testcontext() as u:
|
||||
self.assertRaises(KeyError, s.remove, u)
|
||||
self.assertNotIn(u, s)
|
||||
with testcontext() as u:
|
||||
s.add(u)
|
||||
self.assertIn(u, s)
|
||||
t = s.copy()
|
||||
with testcontext() as u:
|
||||
s.update(t)
|
||||
self.assertEqual(len(s), len(t))
|
||||
with testcontext() as u:
|
||||
s.clear()
|
||||
self.assertEqual(len(s), 0)
|
||||
|
||||
|
||||
def test_main(verbose=None):
|
||||
test_support.run_unittest(TestWeakSet)
|
||||
|
||||
if __name__ == "__main__":
|
||||
test_main(verbose=True)
|
||||
|
|
@ -24,6 +24,7 @@ class Test_TestResult(unittest.TestCase):
|
|||
self.assertEqual(result.testsRun, 0)
|
||||
self.assertEqual(result.shouldStop, False)
|
||||
|
||||
|
||||
# "This method can be called to signal that the set of tests being
|
||||
# run should be aborted by setting the TestResult's shouldStop
|
||||
# attribute to True."
|
||||
|
|
|
|||
|
|
@ -20,6 +20,8 @@ from _weakref import (
|
|||
ProxyType,
|
||||
ReferenceType)
|
||||
|
||||
from _weakrefset import WeakSet
|
||||
|
||||
from exceptions import ReferenceError
|
||||
|
||||
|
||||
|
|
@ -27,7 +29,7 @@ ProxyTypes = (ProxyType, CallableProxyType)
|
|||
|
||||
__all__ = ["ref", "proxy", "getweakrefcount", "getweakrefs",
|
||||
"WeakKeyDictionary", "ReferenceError", "ReferenceType", "ProxyType",
|
||||
"CallableProxyType", "ProxyTypes", "WeakValueDictionary"]
|
||||
"CallableProxyType", "ProxyTypes", "WeakValueDictionary", 'WeakSet']
|
||||
|
||||
|
||||
class WeakValueDictionary(UserDict.UserDict):
|
||||
|
|
|
|||
|
|
@ -37,6 +37,8 @@ Library
|
|||
True/False. This makes Fraction <=> complex comparisons consistent with
|
||||
int <=> complex, float <=> complex, and complex <=> complex comparisons.
|
||||
|
||||
- Addition of ``WeakSet`` to the ``weakref`` module.
|
||||
|
||||
- logging: Added LOG_FTP to SysLogHandler and updated documentation.
|
||||
|
||||
- Issue #8205: Remove the "Modules" directory from sys.path when Python is
|
||||
|
|
|
|||
Loading…
Reference in New Issue