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https://issues.apache.org/jira/browse/BEAM-10690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17548773#comment-17548773
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Danny McCormick commented on BEAM-10690:
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This issue has been migrated to https://github.com/apache/beam/issues/20388
> Python type hints: support constrained TypeVars
> -----------------------------------------------
>
> Key: BEAM-10690
> URL: https://issues.apache.org/jira/browse/BEAM-10690
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Udi Meiri
> Priority: P3
> Labels: types
>
> Support the following syntax when converting to internal Beam types,
> and raise a TypeCheckError when trying to bind anything that isn't Any, one
> of the listed types, or a subtype of the listed types.
> {code}
> AnyStr = TypeVar('AnyStr', Text, bytes)
> {code}
> See: https://www.python.org/dev/peps/pep-0484/#generics (lots of cases to
> check)
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