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[3.13] gh-83731: Test that isinstance() ignores tuple subclass methods (GH-158000) - #159565

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[3.13] gh-83731: Test that isinstance() ignores tuple subclass methods (GH-158000)#159565
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@vasiliyk vasiliyk commented Oct 16, 2026 •
edited by bedevere-app Bot
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Manual backport of #158000 to 3.13.

The conflict was only in the surrounding context of Lib/test/test_isinstance.py.
cc @methane

@vasiliyk
pythongh-83731: Test that isinstance() ignores tuple subclass methods (…
12409e9 
…python#158000)

Add a regression test to make sure isinstance() reads the items of a
tuple subclass directly, without calling its __iter__(), __getitem__()
or __len__().

(cherry picked from commit 21a36aa)
@bedevere-app bedevere-app Bot added awaiting review tests Tests in the Lib/test dir labels Oct 16, 2026
This was referenced Oct 16, 2026
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