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gh-91081: Add note on WeakKeyDictionary behavior when deleting a replaced entry #91499

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Merged
merged 9 commits into from
Dec 21, 2022
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gh-91081: Add note on WeakKeyDictionary behavior when deleting a replaced entry #91499

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ea0f7ba
Add note about new key not replacing existing key for weakref
slateny Apr 13, 2022
5961498
Add extra sentence to correct misunderstanding of issue
slateny Apr 13, 2022
4ccddc5
Add missing "the"
slateny Apr 13, 2022
3c1413d
Add specific example
slateny Apr 27, 2022
c2f649f
Make example runnable
slateny Apr 27, 2022
c4ac22d
Add weakref. for dict example
slateny Apr 27, 2022
69b3231
Remove one newline
slateny Dec 10, 2022
9f22bd7
Add workaround example
slateny Dec 10, 2022
e17e69f
Use del over pop()
slateny Dec 21, 2022
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Make example runnable
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@slateny
slateny committed Apr 27, 2022
commit c2f649f45b5bff66044f34245c468952789885ff
17 changes: 9 additions & 8 deletions Doc/library/weakref.rst
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Expand Up @@ -172,14 +172,15 @@ See :ref:`__slots__ documentation <slots>` for details.
existing key. Due to this, when the reference to the original key is deleted, it
also deletes the entry in the dictionary::

class T(str):
pass
k1 = T('hello')
k2 = T('hello')
d = WeakKeyDictionary()
d[k1] = 1 # d = {k1: 1}
d[k2] = 2 # d = {k1: 2}
del k1 # d = {}
>>> class T(str):
... pass
...
>>> k1, k2 = T(), T()
>>> d = WeakKeyDictionary()
>>> d[k1] = 1 # d = {k1: 1}
>>> d[k2] = 2 # d = {k1: 2}
>>> del k1 # d = {}


.. versionchanged:: 3.9
Added support for ``|`` and ``|=`` operators, specified in :pep:`584`.
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