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https://issues.apache.org/jira/browse/BEAM-12465?focusedWorklogId=609378&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-609378
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ASF GitHub Bot logged work on BEAM-12465:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 09/Jun/21 20:32
Start Date: 09/Jun/21 20:32
Worklog Time Spent: 10m
Work Description: gpshead commented on pull request #14975:
URL: https://github.com/apache/beam/pull/14975#issuecomment-858080836
I believe the change comes from the
https://docs.python.org/3/whatsnew/3.7.html#pep-560-core-support-for-typing-module-and-generic-types
PEP-560 refactoring work. The internals of the `typing` module evolved _a
lot_ between 3.6 and 3.7.
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Issue Time Tracking
-------------------
Worklog Id: (was: 609378)
Time Spent: 2h 40m (was: 2.5h)
> 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
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> 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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