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[3.9] bpo-42317: Improve docs of typing.get_args concerning Union (GH-23254) by miss-islington · Pull Request #23307 · python/cpython · GitHub

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[3.9] bpo-42317: Improve docs of typing.get_args concerning Union (GH-23254) #23307

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Nov 16, 2020
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[3.9] bpo-42317: Improve docs of typing.get_args concerning Union (GH-23254) #23307

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3 changes: 3 additions & 0 deletions Doc/library/typing.rst
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Expand Up @@ -1687,6 +1687,9 @@ Introspection helpers
For a typing object of the form ``X[Y, Z, ...]`` these functions return
``X`` and ``(Y, Z, ...)``. If ``X`` is a generic alias for a builtin or
:mod:`collections` class, it gets normalized to the original class.
If ``X`` is a :class:`Union` contained in another generic type,
the order of ``(Y, Z, ...)`` may be different from the order of
the original arguments ``[Y, Z, ...]`` due to type caching.
For unsupported objects return ``None`` and ``()`` correspondingly.
Examples::

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