8000 gh-124120: Document `Annotated.__origin__` by sobolevn · Pull Request #124125 · python/cpython · GitHub
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merged 6 commits into from
Sep 24, 2024
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gh-124120: Document Annotated.__origin__ #124125

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748a3c7
gh-124120: Document use of `get_origin` to access `Annotated` origin
sobolevn Sep 16, 2024
e82bb85
Also mention Annotated in get_origin docs
sobolevn Sep 16, 2024
2750cf8
Fix test
sobolevn Sep 16, 2024
a9a3f74
Update Doc/library/typing.rst
sobolevn Sep 16, 2024
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Apply suggestions from code review
sobolevn Sep 16, 2024
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Fix tests
sobolevn Sep 16, 2024
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18 changes: 18 additions & 0 deletions Doc/library/typing.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1458,6 +1458,23 @@ These can be used as types in annotations. They all support subscription using
>>> X.__metadata__
('very', 'important', 'metadata')

* At runtime, if you want to retrieve the original
type wrapped by ``Annotated``, use the :attr:`!__origin__` attribute:

.. doctest::

>>> from typing import Annotated, get_origin
>>> Password = Annotated[str, "secret"]
>>> Password.__origin__
<class 'str'>

Note that using :func:`get_origin` will return ``Annotated`` itself:

.. doctest::

>>> get_origin(Password)
typing.Annotated

.. seealso::

:pep:`593` - Flexible function and variable annotations
Expand Down Expand Up @@ -3298,6 +3315,7 @@ Introspection helpers
assert get_origin(str) is None
assert get_origin(Dict[str, int]) is dict
assert get_origin(Union[int, str]) is Union
assert get_origin(Annotated[str, "metadata"]) is Annotated
P = ParamSpec('P')
assert get_origin(P.args) is P
assert get_origin(P.kwargs) is P
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