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https://issues.apache.org/jira/browse/BEAM-3730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546802#comment-17546802
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Kenneth Knowles commented on BEAM-3730:
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This issue has been migrated to https://github.com/apache/beam/issues/18633
> typehints.TypeVariable issues with __hash__
> -------------------------------------------
>
> Key: BEAM-3730
> URL: https://issues.apache.org/jira/browse/BEAM-3730
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Luke Zhu
> Priority: P3
>
> This class currently does not define a __hash__ function. This defies the
> assumption made by sets and dicts which contain TypeConstraint objects.
> In Python 3, classes which define ___eq___ also need to explicitly define
> ___hash___ to be hashable. However, this causes
> _combiners_test.CombineTest.test_to_list_and_to_dict_ to throw an error in
> slow_stream.py (adding NoneType and long).
> There are multiple TypeVariable instances with name 'K' or 'V' throughout the
> codebase. The equality of these instances may possibly cause issues.
>
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