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bpo-43977: Properly update the tp_flags of existing subclasses when their parents are register'd #26864

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merged 5 commits into from
Jun 25, 2021
Merged

bpo-43977: Properly update the tp_flags of existing subclasses when their parents are register'd #26864

merged 5 commits into from
Jun 25, 2021

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brandtbucher
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@brandtbucher brandtbucher commented Jun 22, 2021 •
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Currently, the Py_TPFLAGS_MAPPING and Py_TPFLAGS_SEQUENCE flags aren't set correctly on child classes created before their parent is registered as aMapping or Sequence.

When setting these flags, recurse through the tree of existing subclasses and set their flags too.

https://bugs.python.org/issue43977

@brandtbucher brandtbucher added type-bug An unexpected behavior, bug, or error docs Documentation in the Doc dir needs backport to 3.10 only security fixes labels Jun 22, 2021
@markshannon
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This could represent a change to PEP 634, depending on how you read it.
Could you add a clarification to PEP 634 as well, stating that the order of registering and subclassing is unimportant.

@brandtbucher brandtbucher mentioned this pull request Jun 24, 2021
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@brandtbucher brandtbucher merged commit ca2009d into python:main Jun 25, 2021
@miss-islington
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Thanks @brandtbucher for the PR 🌮🎉.. I'm working now to backport this PR to: 3.10.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Jun 25, 2021
@brandtbucher @miss-islington
bpo-43977: Properly update the tp_flags of existing subclasses when t…
d23bd87 
…heir parents are registered (pythonGH-26864)

(cherry picked from commit ca2009d)

Co-authored-by: Brandt Bucher <brandt@python.org>
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GH-26908 is a backport of this pull request to the 3.10 branch.

@bedevere-bot bedevere-bot removed the needs backport to 3.10 only security fixes label Jun 25, 2021
miss-islington added a commit that referenced this pull request Jun 25, 2021
@miss-islington @brandtbucher
bpo-43977: Properly update the tp_flags of existing subclasses when t…
8897012 
…heir parents are registered (GH-26864)

(cherry picked from commit ca2009d)

Co-authored-by: Brandt Bucher <brandt@python.org>
@pablogsal pablogsal mentioned this pull request Jul 18, 2021
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@brandtbucher brandtbucher deleted the late-registration branch July 21, 2022 20:19
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