Udi Meiri created BEAM-10690:
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Summary: Python type hints: suport 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
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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