GeezerVison is showing github.com — `typing._UnionGenericAlias` is unhashable in 3.14 · Issue #133925 · python/cpython
typing._UnionGenericAlias is unhashable in 3.14 #133925
DescriptionBug report
Bug description:
typing._UnionGenericAlias) became unshable somewhere between 3.13 and 3.14.0b1 (most likely in gh-105511)
import typing
hash(typing._UnionGenericAlias) Traceback (most recent call last):
File "<python-input-0>", line 2, in <module>
hash(typing._UnionGenericAlias)
~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: unhashable type: '_UnionGenericAliasMeta'This was hit in a doctest from astropy: xref astropy/astropy#18126
To be clear, the test in question doesn't necessarily correspond to a real-life application; we're testing that our itersubclasses utility function works in a very broad case where we try to retrieve all defined subclasses of object, and do a bit of internal book-keeping using a set of already-visited classes. This used to work in Python 3.13 (and seems to have worked with no interruption for 10+ years), so it still seemed worth a shot to see if that would be considered a bug here. Otherwise, it should be possible to fix the function on our side to either special case this exact class, ignore any unhashable class, or avoid reequiring hashability altogether.
CPython versions tested on:
3.14
Operating systems tested on:
Linux
Linked PRs
Activityhugovk commented on May 12, 2025 Reacted by Clément Robert JelleZijlstra commented on May 12, 2025 It's because I added __eq__ but not __hash__ to the metaclass. Fix in #133929. Reacted by Hugo van Kemenade neutrinoceros commented on May 12, 2025 ContributorAuthor More actions Is there a reason to keep this open after the fox was merged ? AlexWaygood commented on May 12, 2025 no, this is done now that the 🦊 is merged Reacted by Clément Robert and Raphael Gaschignard neutrinoceros commented on May 12, 2025 ContributorAuthor More actions
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