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Issue #17643: Add __callback__ attribute to weakref.ref.

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Mark Dickinson 2013-04-13 15:45:44 +01:00
parent 548677bb8c
commit 556e94b8fe
4 changed files with 44 additions and 3 deletions
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14
Doc/library/weakref.rst
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@ -111,6 +111,15 @@ Extension types can easily be made to support weak references; see
This is a subclassable type rather than a factory function.
.. attribute:: __callback__
This read-only attribute returns the callback currently associated to the
weakref. If there is no callback or if the referent of the weakref is
no longer alive then this attribute will have value ``None``.
.. versionadded:: 3.4
Added the :attr:`__callback__` attribute.
.. function:: proxy(object[, callback])
@ -261,8 +270,9 @@ These method have the same issues as the and :meth:`keyrefs` method of
Weak Reference Objects
----------------------
Weak reference objects have no attributes or methods, but do allow the referent
to be obtained, if it still exists, by calling it:
Weak reference objects have no methods and no attributes besides
:attr:`ref.__callback__`. A weak reference object allows the referent to be
obtained, if it still exists, by calling it:
>>> import weakref
>>> class Object: