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Reuse stdlib PEP 593 implementation in typing_extensions if present #699

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Feb 11, 2020
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Reuse stdlib PEP 593 implementation in typing_extensions if present #699

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9 changes: 8 additions & 1 deletion typing_extensions/src_py3/typing_extensions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1707,7 +1707,14 @@ class Point2D(TypedDict):
"""


if PEP_560:
# Python 3.9+ has PEP 593 (Annotated and modified get_type_hints)
if hasattr(typing, 'Annotated'):
Annotated = typing.Annotated
get_type_hints = typing.get_type_hints
# Not exported and not a public API, but needed for get_origin() and get_args()
# to work.
_AnnotatedAlias = typing._AnnotatedAlias
elif PEP_560:
class _AnnotatedAlias(typing._GenericAlias, _root=True):
"""Runtime representation of an annotated type.

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