This issue tracker has been migrated to GitHub, and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

Author josh.r
Recipients eric.smith, jfuruness, josh.r
Date 2021-10-19.01:25:42
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <>
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'))

Is there a strong motivation to support manually defined __slots__ on top of slots=True that warrants fixing it for 3.10 onward?
Date User Action Args
2021-10-19 01:25:42josh.rsetrecipients: + josh.r, eric.smith, jfuruness
2021-10-19 01:25:42josh.rsetmessageid: <>
2021-10-19 01:25:42josh.rlinkissue45520 messages
2021-10-19 01:25:42josh.rcreate