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Update weakref.rst (GH-14098) 

(cherry picked from commit f475729a71)

Co-authored-by: Géry Ogam <gery.ogam@gmail.com>
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Miss Islington (bot) 2019-06-15 04:49:43 -07:00 committed by GitHub
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Doc/library/weakref.rst
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@ -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
@ -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`.