dataclasses: generated method's using the wrong qualname

[isidentical]

BPO	41747
Nosy	@ericvsmith, @isidentical
PRs	bpo-41747: Ensure all dataclass methods uses their parents' qualname #22155

^{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/ericvsmith'
closed_at = <Date 2020-10-21.13:50:18.058>
created_at = <Date 2020-09-08.20:38:57.596>
labels = ['type-bug', 'library', '3.10']
title = "dataclasses: generated method's using the wrong qualname"
updated_at = <Date 2020-10-21.13:50:18.057>
user = 'https://github.com/isidentical'

bugs.python.org fields:

activity = <Date 2020-10-21.13:50:18.057>
actor = 'eric.smith'
assignee = 'eric.smith'
closed = True
closed_date = <Date 2020-10-21.13:50:18.058>
closer = 'eric.smith'
components = ['Library (Lib)']
creation = <Date 2020-09-08.20:38:57.596>
creator = 'BTaskaya'
dependencies = []
files = []
hgrepos = []
issue_num = 41747
keywords = ['patch']
message_count = 3.0
messages = ['376594', '379208', '379209']
nosy_count = 2.0
nosy_names = ['eric.smith', 'BTaskaya']
pr_nums = ['22155']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41747'
versions = ['Python 3.10']

[isidentical]

$ cat t.py
from dataclasses import dataclass

@dataclass
class Foo:
    bar: int

Foo()
$ python t.py
Traceback (most recent call last):
  File "/home/isidentical/cpython/cpython/t.py", line 7, in <module>
    Foo()
TypeError: __create_fn__.<locals>.__init__() missing 1 required positional argument: 'bar'

[ericvsmith]

New changeset c7437e2 by Batuhan Taskaya in branch 'master':
bpo-41747: Ensure all dataclass methods uses their parents' qualname (GH-22155)
c7437e2

[ericvsmith]

Thanks for the PR!

[USSX-Hares]

Will this be ported to other versions of Python? I have this issue reproduced on Python 3.7.13 and Python 3.9.12.

[ericvsmith]

No, it won't be backported. Both 3.7 and 3.9 are only accepting security related patches.

You could fix it in a custom distribution, but that's about your only option.