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gh-150553: Document object.__weakref__ #151581

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13 changes: 13 additions & 0 deletions Doc/reference/datamodel.rst
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Expand Up @@ -2646,6 +2646,19 @@ Attribute lookup speed can be significantly improved as well.
and *__weakref__* for each instance.


.. attribute:: object.__weakref__

A descriptor added by the implementation to some classes whose instances
support weak references.

This attribute is either ``None`` or a weak reference or proxy object
associated with the instance. Use :func:`weakref.getweakrefs` to retrieve
all weak references and proxy objects that refer to an object.
.. impl-detail::

This attribute may not exist in all Python implementations.


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.. _datamodel-note-slots:

Notes on using *__slots__*:
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