bpo-36424: Add support for pickling frozen dataclasses with __slots__ by ZackerySpytz · Pull Request #22459 · python/cpython
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Allow to pickle and unpickle frozen dataclasses that have __slots__. Co-Authored-By: Claudiu Popa <pcmanticore@gmail.com>
Some of the added code does not adhere to PEP 8 w.r.t. line length -- that is for symmetry with the adjacent _create_fn() calls (which themselves don't follow PEP 8).
What's the status of this PR? We want to send frozen dataclasses to multiple processes in Keras multi-GPU training and the inability to (un)pickle them severely limits this use case.
@Kobzol this was fixed (see issue) but hasn't been backported to 3.9; so one option is to wait for 3.10 release.
Thanks, this was fixed in #25786
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