Enum repr() incorrect when mixed with non-__new__ data types

@ericvsmith

BPO	46108
Nosy	@ericvsmith, @ethanfurman
Superseder	bpo-40066: Enum: modify repr, str; update docs

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/ethanfurman'
closed_at = <Date 2022-01-17.16:59:39.171>
created_at = <Date 2021-12-17.01:13:16.460>
labels = ['type-bug', '3.8', '3.9', '3.10', '3.11']
title = 'Enum repr() incorrect when mixed with non-__new__ data types'
updated_at = <Date 2022-01-17.16:59:39.170>
user = 'https://github.com/ethanfurman'

bugs.python.org fields:

activity = <Date 2022-01-17.16:59:39.170>
actor = 'ethan.furman'
assignee = 'ethan.furman'
closed = True
closed_date = <Date 2022-01-17.16:59:39.171>
closer = 'ethan.furman'
components = []
creation = <Date 2021-12-17.01:13:16.460>
creator = 'ethan.furman'
dependencies = []
files = []
hgrepos = []
issue_num = 46108
keywords = []
message_count = 4.0
messages = ['408748', '408756', '408775', '410806']
nosy_count = 2.0
nosy_names = ['eric.smith', 'ethan.furman']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = '40066'
type = 'behavior'
url = 'https://bugs.python.org/issue46108'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10', 'Python 3.11']

from dataclasses import dataclass
from enum import Enum

@dataclass
class Foo:
    a: int = 0

class Entries(Foo, Enum):
    ENTRY1 = Foo(1)

repr(Entries.ENTRY1) != '<Entries.ENTRY1: Foo(a=1)>'

I know you know this, but here's a version without dataclasses, in case you want to add a test for this, too.

from enum import Enum

class Foo:
    def __init__(self, a):
        self.a = a
    def __repr__(self):
        return f'Foo(a={self.a!r})'

class Entries(Foo, Enum):
    ENTRY1 = Foo(1)

repr(Entries.ENTRY1) != '<Entries.ENTRY1: Foo(a=1)>'

Thanks, test added. I also updated the title.

Code updated to treat any __repr__s as affecting the display of the member value instead of the member itself (i.e. the "<...: %r>" portion). if a user actually wants to change the member repr they can assign it when creating the Enum:

    class Entries(Foo, Enum):
        ENTRY = 1
        __repr__ = Foo.__repr__

assert repr(Entries.ENTRY1) == 'Entries(a=1)'

Fixed in 3.11.

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Enum repr() incorrect when mixed with non-new data types #90266

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Enum repr() incorrect when mixed with non-__new__ data types #90266

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ethanfurman commented on Dec 17, 2021

ericvsmith commented on Dec 17, 2021

ethanfurman commented on Dec 17, 2021

ethanfurman commented on Jan 17, 2022

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Enum repr() incorrect when mixed with non-new data types #90266