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| author | Gregory Beauregard <greg@greg.red> | 2022-02-07 16:21:56 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-02-07 16:21:56 (GMT) |
| commit | e2eeffefed32bb8c47c09bdd94e27a4e949894ef (patch) | |
| tree | 8ba59ca23812faddd3097782ac10e42a1b3ecc12 | |
| parent | c1ff4cb98b11c00aee765019364544c71e7dd2df (diff) | |
| download | cpython-e2eeffefed32bb8c47c09bdd94e27a4e949894ef.zip cpython-e2eeffefed32bb8c47c09bdd94e27a4e949894ef.tar.gz cpython-e2eeffefed32bb8c47c09bdd94e27a4e949894ef.tar.bz2 | |
[3.10] bpo-46655: allow stringized TypeAlias with get_type_hints (GH-31156). (#31175)
(cherry picked from commit 77b025be4a4cd5a3bfc1b1af560cc57e8e956c98)
Co-authored-by: Gregory Beauregard <greg@greg.red>
| -rw-r--r-- | Lib/test/test_typing.py | 5 | ||||
| -rw-r--r-- | Lib/typing.py | 2 | ||||
| -rw-r--r-- | Misc/NEWS.d/next/Library/2022-02-06-08-54-03.bpo-46655.DiLzYv.rst | 1 |
3 files changed, 7 insertions, 1 deletions
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py index f13541e..341be1d 100644 --- a/Lib/test/test_typing.py +++ b/Lib/test/test_typing.py @@ -4768,6 +4768,11 @@ class TypeAliasTests(BaseTestCase): with self.assertRaises(TypeError): isinstance(42, TypeAlias) + def test_stringized_usage(self): + class A: + a: "TypeAlias" + self.assertEqual(get_type_hints(A), {'a': TypeAlias}) + def test_no_issubclass(self): with self.assertRaises(TypeError): issubclass(Employee, TypeAlias) diff --git a/Lib/typing.py b/Lib/typing.py index abd5899..7743c7f 100644 --- a/Lib/typing.py +++ b/Lib/typing.py @@ -165,7 +165,7 @@ def _type_check(arg, msg, is_argument=True, module=None, *, allow_special_forms= if (isinstance(arg, _GenericAlias) and arg.__origin__ in invalid_generic_forms): raise TypeError(f"{arg} is not valid as type argument") - if arg in (Any, NoReturn, Final): + if arg in (Any, NoReturn, Final, TypeAlias): return arg if isinstance(arg, _SpecialForm) or arg in (Generic, Protocol): raise TypeError(f"Plain {arg} is not valid as type argument") diff --git a/Misc/NEWS.d/next/Library/2022-02-06-08-54-03.bpo-46655.DiLzYv.rst b/Misc/NEWS.d/next/Library/2022-02-06-08-54-03.bpo-46655.DiLzYv.rst new file mode 100644 index 0000000..4f0de95 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2022-02-06-08-54-03.bpo-46655.DiLzYv.rst @@ -0,0 +1 @@ +In :func:`typing.get_type_hints`, support evaluating bare stringified ``TypeAlias`` annotations. Patch by Gregory Beauregard.
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