[issue36424] Pickle fails on frozen dataclass that has slots

David Hagen added the comment: Because the implementation in GH-25786 relies on the new `dataclass(slots=True)` feature (i.e. it does not work if the slots are specified with `__slots__`), I don't think this can be trivially backported to versions before 3.10. --

[issue36424] Pickle fails on frozen dataclass that has slots

Andrei Kulakov added the comment: This actually can't be closed yet as the fix was not backported to 3.9 -- ___ Python tracker ___

[issue36424] Pickle fails on frozen dataclass that has slots

Andrei Kulakov added the comment: This was fixed in https://github.com/python/cpython/pull/25786 , and so can be closed. -- nosy: +andrei.avk ___ Python tracker ___

[issue36424] Pickle fails on frozen dataclass that has slots

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[issue36424] Pickle fails on frozen dataclass that has slots

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[issue36424] Pickle fails on frozen dataclass that has slots

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[issue36424] Pickle fails on frozen dataclass that has slots

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[issue36424] Pickle fails on frozen dataclass that has slots

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[issue36424] Pickle fails on frozen dataclass that has slots

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[issue36424] Pickle fails on frozen dataclass that has slots

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[issue36424] Pickle fails on frozen dataclass that has slots

New submission from David Hagen : If a dataclass is `frozen` and has `__slots__`, then unpickling an instance of it fails because the default behavior is to use `setattr` which `frozen` does not allow. ``` import pickle from dataclasses import dataclass @dataclass(frozen=True) class A: