New submission from Guido Imperiale <crusade...@gmail.com>:
Related to #46382
A class decorated with dataclass(slots=True) can't pass any parameters to the
__init_subclass__ method of its parent class.
from dataclasses import dataclass
class A:
__slots__ = ()
def __init_subclass__(cls, msg):
print(msg)
@dataclass(slots=True)
class B(A, msg="Hello world!"):
pass
File "lib/python3.10/dataclasses.py", line 1145, in _add_slots
cls = type(cls)(cls.__name__, cls.__bases__, cls_dict)
TypeError: A.__init_subclass__() missing 1 required positional argument: 'msg'
----------
components: Library (Lib)
messages: 414822
nosy: crusaderky
priority: normal
severity: normal
status: open
title: dataclass(slots=True) incompatible with __init_subclass__
versions: Python 3.10
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46970>
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