[issue39587] Mixin repr overrides Enum repr in some cases

[Ethan Furman]

Change by Ethan Furman :


--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue39587] Mixin repr overrides Enum repr in some cases

[Ethan Furman]

Ethan Furman  added the comment:


New changeset 95b81e2f8c955823dbf5632a817902b8a4916eaa by Miss Islington (bot) 
in branch '3.9':
bpo-39587: Enum - use correct mixed-in data type (GH-22263) (GH-22266)
https://github.com/python/cpython/commit/95b81e2f8c955823dbf5632a817902b8a4916eaa


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[issue39587] Mixin repr overrides Enum repr in some cases

[miss-islington]

miss-islington  added the comment:


New changeset 8f8ebcca95d3b6ed0a522a9736ab53d6d4f0208c by Miss Islington (bot) 
in branch '3.8':
bpo-39587: Enum - use correct mixed-in data type (GH-22263)
https://github.com/python/cpython/commit/8f8ebcca95d3b6ed0a522a9736ab53d6d4f0208c


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[issue39587] Mixin repr overrides Enum repr in some cases

[miss-islington]

Change by miss-islington :


--
nosy: +miss-islington
nosy_count: 5.0 -> 6.0
pull_requests: +21321
pull_request: https://github.com/python/cpython/pull/22265

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[issue39587] Mixin repr overrides Enum repr in some cases

[miss-islington]

Change by miss-islington :


--
pull_requests: +21322
pull_request: https://github.com/python/cpython/pull/22266

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[issue39587] Mixin repr overrides Enum repr in some cases

[Ethan Furman]

Ethan Furman  added the comment:


New changeset bff01f3a3aac0c15fe8fbe8b2f561f7927d117a1 by Ethan Furman in 
branch 'master':
bpo-39587: Enum - use correct mixed-in data type (GH-22263)
https://github.com/python/cpython/commit/bff01f3a3aac0c15fe8fbe8b2f561f7927d117a1


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[issue39587] Mixin repr overrides Enum repr in some cases

[Ethan Furman]

Ethan Furman  added the comment:

Yes, the change only considered types with their own copy of `__new__` to be 
actual data types, so in 3.6 `HexInt` was the recognized data type, but in 3.7+ 
it was `int` -- which also meant that HexEnum was considered a simple mix-in 
and its `__repr__` was used instead of `Enum.__repr__`.

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[issue39587] Mixin repr overrides Enum repr in some cases

[Ethan Furman]

Change by Ethan Furman :


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

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[issue39587] Mixin repr overrides Enum repr in some cases

[Ethan Furman]

Change by Ethan Furman :


--
keywords: +patch
pull_requests: +21319
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22263

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[issue39587] Mixin repr overrides Enum repr in some cases

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

Bisecting points to issue29577 that introduced this change.

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nosy: +xtreak

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[issue39587] Mixin repr overrides Enum repr in some cases

[Raymond Hettinger]

Change by Raymond Hettinger :


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assignee:  -> ethan.furman

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[issue39587] Mixin repr overrides Enum repr in some cases

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


--
nosy: +barry, eli.bendersky, ethan.furman

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[issue39587] Mixin repr overrides Enum repr in some cases

[Ryan McCampbell]

New submission from Ryan McCampbell :

In Python 3.6 the following works:

class HexInt(int):
def __repr__(self):
return hex(self)

class MyEnum(HexInt, enum.Enum):
A = 1
B = 2
C = 3

>>> MyEnum.A


However in Python 3.7/8 it instead prints
>>> MyEnum.A
0x1

It uses HexInt's repr instead of Enum's. Looking at the enum.py module it seems 
that this occurs for mixin classes that don't define __new__ due to a change in 
the _get_mixins_ method. If I define a __new__ method on the HexInt class then 
the expected behavior occurs.

--
components: Library (Lib)
messages: 361635
nosy: rmccampbell7
priority: normal
severity: normal
status: open
title: Mixin repr overrides Enum repr in some cases
type: behavior
versions: Python 3.7, Python 3.8

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