8000 [3.7] Update weakref.rst (GH-14098) by miss-islington · Pull Request #14106 · python/cpython · GitHub
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[3.7] Update weakref.rst (GH-14098) #14106

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Jun 15, 2019
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[3.7] Update weakref.rst (GH-14098) #14106

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11 changes: 6 additions & 5 deletions Doc/library/weakref.rst
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Expand Up @@ -65,8 +65,8 @@ exposed by the :mod:`weakref` module for the benefit of advanced uses.

Not all objects can be weakly referenced; those objects which can include class
instances, functions written in Python (but not in C), instance methods, sets,
frozensets, some :term:`file objects <file object>`, :term:`generator`\s, type
objects, sockets, arrays, deques, regular expression pattern objects, and code
frozensets, some :term:`file objects <file object>`, :term:`generators <generator>`,
type objects, sockets, arrays, deques, regular expression pattern objects, and code
objects.

.. versionchanged:: 3.2
Expand All @@ -80,9 +80,10 @@ support weak references but can add support through subclassing::

obj = Dict(red=1, green=2, blue=3) # this object is weak referenceable

Other built-in types such as :class:`tuple` and :class:`int` do not support weak
references even when subclassed (This is an implementation detail and may be
different across various Python implementations.).
.. impl-detail::

Other built-in types such as :class:`tuple` and :class:`int` do not support weak
references even when subclassed.

Extension types can easily be made to support weak references; see
:ref:`weakref-support`.
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