From 1781525422c7162a0aec2fda1dc95e45123b419a Mon Sep 17 00:00:00 2001 From: "Miss Islington (bot)" <31488909+miss-islington@users.noreply.github.com> Date: Fri, 27 Dec 2024 02:25:56 +0100 Subject: [PATCH] [3.13] gh-127537: Add __class_getitem__ to the python implementation of functools.partial (GH-127537) (#128281) gh-127537: Add __class_getitem__ to the python implementation of functools.partial (GH-127537) (cherry picked from commit 401bba6b58497ce59e7b45ad33e43ae8c67abcb9) Co-authored-by: CF Bolz-Tereick --- Lib/functools.py | 3 +++ Lib/test/test_functools.py | 6 ++++++ .../Library/2024-12-04-10-39-29.gh-issue-83662.CG1s3m.rst | 5 +++++ 3 files changed, 14 insertions(+) create mode 100644 Misc/NEWS.d/next/Library/2024-12-04-10-39-29.gh-issue-83662.CG1s3m.rst diff --git a/Lib/functools.py b/Lib/functools.py index e0140e84842a..2bc5053bd1b5 100644 --- a/Lib/functools.py +++ b/Lib/functools.py @@ -351,6 +351,9 @@ class partial: self.args = args self.keywords = kwds + __class_getitem__ = classmethod(GenericAlias) + + try: from _functools import partial except ImportError: diff --git a/Lib/test/test_functools.py b/Lib/test/test_functools.py index 1ce0f4d0aea6..894adb699c87 100644 --- a/Lib/test/test_functools.py +++ b/Lib/test/test_functools.py @@ -411,6 +411,12 @@ class TestPartial: self.assertEqual(a.cmeth(3, b=4), ((1, A, 3), {'a': 2, 'b': 4})) self.assertEqual(a.smeth(3, b=4), ((1, 3), {'a': 2, 'b': 4})) + def test_partial_genericalias(self): + alias = self.partial[int] + self.assertIs(alias.__origin__, self.partial) + self.assertEqual(alias.__args__, (int,)) + self.assertEqual(alias.__parameters__, ()) + @unittest.skipUnless(c_functools, 'requires the C _functools module') class TestPartialC(TestPartial, unittest.TestCase): diff --git a/Misc/NEWS.d/next/Library/2024-12-04-10-39-29.gh-issue-83662.CG1s3m.rst b/Misc/NEWS.d/next/Library/2024-12-04-10-39-29.gh-issue-83662.CG1s3m.rst new file mode 100644 index 000000000000..5e3993304799 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2024-12-04-10-39-29.gh-issue-83662.CG1s3m.rst @@ -0,0 +1,5 @@ +Add missing ``__class_getitem__`` method to the Python implementation of +:func:`functools.partial`, to make it compatible with the C version. This is +mainly relevant for alternative Python implementations like PyPy and +GraalPy, because CPython will usually use the C-implementation of that +function. -- 2.47.3