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https://issues.apache.org/jira/browse/BEAM-12465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kenneth Knowles updated BEAM-12465:
-----------------------------------
Status: Open (was: Triage Needed)
> Fix handling of nested typing.Generic type hints in Py3.7+
> ----------------------------------------------------------
>
> Key: BEAM-12465
> URL: https://issues.apache.org/jira/browse/BEAM-12465
> Project: Beam
> Issue Type: Improvement
> Components: sdk-py-core
> Reporter: Udi Meiri
> Assignee: Udi Meiri
> Priority: P2
>
> When Beam attempts to convert a type hint like
> `typing.Tuple[PCollection[int], PCollection[int]]` it will fail in Python
> 3.7+ with something like:
> {code}
> TypeError: Parameter to List hint must be a non-sequence, a type, or a
> TypeConstraint. PCollection[int] is an instance of _GenericAlias.
> {code}
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