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gh-150553: Document object.__weakref__ #151581

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12 changes: 12 additions & 0 deletions Doc/reference/datamodel.rst
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Expand Up @@ -2646,6 +2646,18 @@ Attribute lookup speed can be significantly improved as well.
and *__weakref__* for each instance.


.. attribute:: object.__weakref__

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

When accessed on an instance, this attribute is either ``None`` or a
weak reference or weak proxy object associated with the instance. It is
not a complete list of all weak references to the instance. Use
:func:`weakref.getweakrefs` to retrieve all weak references and proxy
objects that refer to an object.


.. _datamodel-note-slots:

Notes on using *__slots__*:
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