bpo-40895: Update weakref documentation to remove old warnings by asqui · Pull Request #20687 · python/cpython

Expand Up @@ -163,14 +163,6 @@ Extension types can easily be made to support weak references; see application without adding attributes to those objects. This can be especially useful with objects that override attribute accesses.
.. note::
Caution: Because a :class:`WeakKeyDictionary` is built on top of a Python dictionary, it must not change size when iterating over it. This can be difficult to ensure for a :class:`WeakKeyDictionary` because actions performed by the program during iteration may cause items in the dictionary to vanish "by magic" (as a side effect of garbage collection).
.. versionchanged:: 3.9 Added support for ``|`` and ``|=`` operators, specified in :pep:`584`.
Expand All @@ -192,14 +184,6 @@ than needed. Mapping class that references values weakly. Entries in the dictionary will be discarded when no strong reference to the value exists any more.
.. note::
Caution: Because a :class:`WeakValueDictionary` is built on top of a Python dictionary, it must not change size when iterating over it. This can be difficult to ensure for a :class:`WeakValueDictionary` because actions performed by the program during iteration may cause items in the dictionary to vanish "by magic" (as a side effect of garbage collection).
.. versionchanged:: 3.9 Added support for ``|`` and ``|=`` operators, as specified in :pep:`584`.
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