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3.11 unexpected multiple inheritance method lookup difference? #94601

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3.11 unexpected multiple inheritance method lookup difference?#94601
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ethanfurman
Labels
3.11only security fixes3.12only security fixesstdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

Description

@justvanrossum
justvanrossum
opened on Jul 6, 2022

Bug report

The following snippet has a different output on Python 3.11.0b3 than on <= 3.10:

import enum

class StrMixin:
    def __str__(self):
        return f"__str__ from {self.__class__.__name__} {self.value}"

class MyEnumTuple(tuple, StrMixin, enum.Enum):
	FIELD = (1, 0)

x = MyEnumTuple((1, 0))
print(x)

On 3.10 and earlier it outputs:

__str__ from EnumMixin (1, 0)

On 3.11.0b3 it outputs this:

MyEnumTuple.FIELD

My environment

  • CPython versions tested on: 3.11.0b3, 3.10.1, 3.9.7
  • Operating system and architecture: macOS 10.15.7, x86_64

Activity

  1. justvanrossum
    added
    type-bugAn unexpected behavior, bug, or error
    on Jul 6, 2022
  2. justvanrossum
    added a commit that references this issue on Jul 6, 2022

    fix UFOFormatVersion tuple's __str__ in python 3.11

    5ca5791
  3. AlexWaygood
    assigned
    ethanfurman
    on Jul 6, 2022
  4. AlexWaygood
    added
    stdlibStandard Library Python modules in the Lib/ directory
    3.11only security fixes
    3.12only security fixes
    on Jul 6, 2022
  5. ethanfurman
    added a commit that references this issue on Jul 18, 2022

    gh-94601: [Enum] fix inheritance for __str__ and friends (GH-94942)

    c961d14
  6. miss-islington
    added 2 commits that reference this issue on Jul 18, 2022

    pythongh-94601: [Enum] fix inheritance for __str__ and friends (pytho…

    b4cd59f

    gh-94601: [Enum] fix inheritance for __str__ and friends (GH-94942)

    e747562

  7. hauntsaninja commented on Oct 12, 2022

    @hauntsaninja
    hauntsaninja
    on Oct 12, 2022
    Contributor

    Thanks for reporting this! Looks like it's been fixed

  8. hauntsaninja
    closed this as completedon Oct 12, 2022
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3.11only security fixes3.12only security fixesstdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

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