diff options
| -rw-r--r-- | Lib/functools.py | 3 | ||||
| -rw-r--r-- | Lib/test/test_functools.py | 6 | ||||
| -rw-r--r-- | Misc/NEWS.d/next/Library/2024-12-04-10-39-29.gh-issue-83662.CG1s3m.rst | 5 |
3 files changed, 14 insertions, 0 deletions
diff --git a/Lib/functools.py b/Lib/functools.py index eff6540..786b8ae 100644 --- a/Lib/functools.py +++ b/Lib/functools.py @@ -433,6 +433,9 @@ class partial: self._phcount = phcount self._merger = merger + __class_getitem__ = classmethod(GenericAlias) + + try: from _functools import partial, Placeholder, _PlaceholderType except ImportError: diff --git a/Lib/test/test_functools.py b/Lib/test/test_functools.py index ffd2adb..4a0252c 100644 --- a/Lib/test/test_functools.py +++ b/Lib/test/test_functools.py @@ -473,6 +473,12 @@ 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 0000000..5e39933 --- /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. |