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| author | Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> | 2020-11-16 01:52:22 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-11-16 01:52:22 (GMT) |
| commit | 2369759a47c5292bacf2eef17b4e2388b7d36675 (patch) | |
| tree | 49312df4c0c2d82a0cf8121ae65063b881dc27ec | |
| parent | 2837241f22be33a5597707b2aa723cb2cf6f3967 (diff) | |
| download | cpython-2369759a47c5292bacf2eef17b4e2388b7d36675.zip cpython-2369759a47c5292bacf2eef17b4e2388b7d36675.tar.gz cpython-2369759a47c5292bacf2eef17b4e2388b7d36675.tar.bz2 | |
bpo-42317: Improve docs of typing.get_args concerning Union (GH-23254)
(cherry picked from commit c3b9592244a9112d8af9610ff1c4e1e4cd4bfaca)
Co-authored-by: Dominik1123 <15989985+Dominik1123@users.noreply.github.com>
| -rw-r--r-- | Doc/library/typing.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst index a5f8b04..324abde 100644 --- a/Doc/library/typing.rst +++ b/Doc/library/typing.rst @@ -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:: |