[issue16453] Inconsistent dead weakref equality

[Jesús Cea Avión]

Changes by Jesús Cea Avión :


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nosy: +jcea

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[issue16453] Inconsistent dead weakref equality

[Antoine Pitrou]

Antoine Pitrou added the comment:

Now fixed.

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resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed

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[issue16453] Inconsistent dead weakref equality

[Roundup Robot]

Roundup Robot added the comment:

New changeset 13b74c0b040c by Antoine Pitrou in branch '2.7':
Issue #16453: Fix equality testing of dead weakref objects.
http://hg.python.org/cpython/rev/13b74c0b040c

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[issue16453] Inconsistent dead weakref equality

[Roundup Robot]

Roundup Robot added the comment:

New changeset 590f1b55abea by Antoine Pitrou in branch '3.2':
Issue #16453: Fix equality testing of dead weakref objects.
http://hg.python.org/cpython/rev/590f1b55abea

New changeset c00e2c1cb3a7 by Antoine Pitrou in branch '3.3':
Issue #16453: Fix equality testing of dead weakref objects.
http://hg.python.org/cpython/rev/c00e2c1cb3a7

New changeset 9e80ea48ff39 by Antoine Pitrou in branch 'default':
Issue #16453: Fix equality testing of dead weakref objects.
http://hg.python.org/cpython/rev/9e80ea48ff39

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nosy: +python-dev

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[issue16453] Inconsistent dead weakref equality

[Antoine Pitrou]

Antoine Pitrou added the comment:

Aha, it is even worse:

>>> o = O()
>>> q = weakref.ref(o)
>>> r = weakref.ref(o)
>>> del o
>>> q() is None
True
>>> q == r
True
>>> q != r
True

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[issue16453] Inconsistent dead weakref equality

[Antoine Pitrou]

New submission from Antoine Pitrou:

Dead weakrefs to a given object happen to be equal if they don't have a 
callback, but unequal if they do. However, they are always equal when alive:

>>> class O: pass
... 
>>> o = O()
>>> def cb(_): pass
... 
>>> q = weakref.ref(o)
>>> r = weakref.ref(o)
>>> s = weakref.ref(o, cb)
>>> t = weakref.ref(o, cb)
>>> q == r
True
>>> s == t
True
>>> del o
>>> q() is None
True
>>> q == r
True
>>> s == t
False

This may be related to the following optimization (?):

>>> q is r
True
>>> s is t
False

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components: Library (Lib)
messages: 175378
nosy: fdrake, pitrou, tim_one
priority: normal
severity: normal
status: open
title: Inconsistent dead weakref equality
type: behavior
versions: Python 2.7, Python 3.2, Python 3.3, Python 3.4

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