[issue41517] Able to subclass enum with members by using multiple inheritance

[Ethan Furman]

Change by Ethan Furman :


--
assignee:  -> ethan.furman
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue41517] Able to subclass enum with members by using multiple inheritance

[miss-islington]

miss-islington  added the comment:


New changeset 48f99250ff319e36b15b555128cd62e408d8165f by Miss Islington (bot) 
in branch '3.9':
bpo-41517: do not allow Enums to be extended (GH-22271)
https://github.com/python/cpython/commit/48f99250ff319e36b15b555128cd62e408d8165f


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[issue41517] Able to subclass enum with members by using multiple inheritance

[miss-islington]

miss-islington  added the comment:


New changeset 3f4012117bf80aa7c005f8fa6fb8e1f8b1aef5d5 by Miss Islington (bot) 
in branch '3.8':
bpo-41517: do not allow Enums to be extended (GH-22271)
https://github.com/python/cpython/commit/3f4012117bf80aa7c005f8fa6fb8e1f8b1aef5d5


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[issue41517] Able to subclass enum with members by using multiple inheritance

[miss-islington]

Change by miss-islington :


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pull_requests: +21332
pull_request: https://github.com/python/cpython/pull/22279

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[issue41517] Able to subclass enum with members by using multiple inheritance

[Ethan Furman]

Ethan Furman  added the comment:


New changeset 3064dbf5df1021e85b507366a7ea448c8895efe7 by Ethan Furman in 
branch 'master':
bpo-41517: do not allow Enums to be extended (#22271)
https://github.com/python/cpython/commit/3064dbf5df1021e85b507366a7ea448c8895efe7


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[issue41517] Able to subclass enum with members by using multiple inheritance

[miss-islington]

Change by miss-islington :


--
nosy: +miss-islington
nosy_count: 7.0 -> 8.0
pull_requests: +21331
pull_request: https://github.com/python/cpython/pull/22278

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[issue41517] Able to subclass enum with members by using multiple inheritance

[Ethan Furman]

Change by Ethan Furman :


--
versions: +Python 3.10, Python 3.8, Python 3.9 -Python 3.7

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[issue41517] Able to subclass enum with members by using multiple inheritance

[Ethan Furman]

Change by Ethan Furman :


--
keywords: +patch
pull_requests: +21326
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22271

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[issue41517] Able to subclass enum with members by using multiple inheritance

[Ethan Furman]

Ethan Furman  added the comment:

To answer the invariant question, see this post by Guido:

  https://mail.python.org/pipermail/python-dev/2013-April/125716.html

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[issue41517] Able to subclass enum with members by using multiple inheritance

[Steven D'Aprano]

Steven D'Aprano  added the comment:

The documentation says:

"Allowing subclassing of enums that define members would lead to a violation of 
some important invariants of types and instances."

but it isn't clear what those invariants are, or why it is more of a problem 
for enums than any other subclassing situation. Could the docs be updated to 
explain why it is prohibited?

--
nosy: +steven.daprano
title: Enum multiple inheritance loophole -> Able to subclass enum with members 
by using multiple inheritance

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