Josh Rosenberg <shadowranger+pyt...@gmail.com> added the comment:
When I define this with the new-in-3.10 slots=True argument to dataclass rather
than manually defining __slots__ it works just fine. Looks like the pickle
format changes rather dramatically to accommodate it.
>>> @dataclass(frozen=True, slots=True)
... class FrozenData:
... my_string: str
...
>>> deepcopy(FrozenData('initial'))
FrozenData(my_string='initial')
Is there a strong motivation to support manually defined __slots__ on top of
slots=True that warrants fixing it for 3.10 onward?
----------
nosy: +josh.r
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45520>
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