https://github.com/python/cpython/commit/f86e295a40a1601505d7d7a52c8caf15d9f8cd1b commit: f86e295a40a1601505d7d7a52c8caf15d9f8cd1b branch: 3.14 author: Miss Islington (bot) <[email protected]> committer: sobolevn <[email protected]> date: 2026-07-02T13:16:30Z summary:
[3.14] gh-150069: Test frozen dataclass and properties interaction (GH-150070) (#152883) gh-150069: Test frozen dataclass and properties interaction (GH-150070) (cherry picked from commit 753f82db2fed38bf725ded2b333ea3749c81fe82) Co-authored-by: sobolevn <[email protected]> files: M Lib/test/test_dataclasses/__init__.py diff --git a/Lib/test/test_dataclasses/__init__.py b/Lib/test/test_dataclasses/__init__.py index 39e3e1ce3f7e12c..acbbf60ef3745b5 100644 --- a/Lib/test/test_dataclasses/__init__.py +++ b/Lib/test/test_dataclasses/__init__.py @@ -3339,6 +3339,47 @@ def test_non_frozen_normal_derived(self): class D: x: int y: int = 10 + z: int = 1 + + @property + def readonly(self) -> int: + return self.x + + @property + def prop(self) -> int: + return self.z + + @prop.setter + def prop(self, val: int) -> None: + object.__setattr__(self, 'z', val) + + @prop.deleter + def prop(self) -> None: + object.__setattr__(self, 'z', 0) + + d = D(5) + self.assertEqual(d.x, 5) + self.assertEqual(d.y, 10) + self.assertEqual(d.z, 1) + self.assertEqual(d.readonly, 5) + self.assertEqual(d.prop, 1) + + with self.assertRaises(FrozenInstanceError): + d.x = 5 + with self.assertRaises(FrozenInstanceError): + d.readonly = 5 + with self.assertRaises(FrozenInstanceError): + d.z = 5 + with self.assertRaises(FrozenInstanceError): + d.prop = 5 + with self.assertRaises(FrozenInstanceError): + del d.prop + + self.assertEqual(d.x, 5) + self.assertEqual(d.y, 10) + self.assertEqual(d.z, 1) + self.assertEqual(d.readonly, 5) + self.assertEqual(d.prop, 1) class S(D): pass @@ -3346,16 +3387,40 @@ class S(D): s = S(3) self.assertEqual(s.x, 3) self.assertEqual(s.y, 10) + self.assertEqual(s.z, 1) + self.assertEqual(s.readonly, 3) + self.assertEqual(s.prop, 1) + # Can set new attrs: s.cached = True + self.assertTrue(s.cached) + # Can mutate them: + s.cached = False + self.assertFalse(s.cached) + + # Can also change writable properties: + with self.assertRaisesRegex( + AttributeError, + 'object has no setter', + ) as cm: + s.readonly = 5 + self.assertNotIsInstance(cm.exception, FrozenInstanceError) + s.prop = 2 + self.assertEqual(s.x, 3) + self.assertEqual(s.readonly, 3) + self.assertEqual(s.prop, 2) + self.assertEqual(s.z, 2) # But can't change the frozen attributes. with self.assertRaises(FrozenInstanceError): s.x = 5 with self.assertRaises(FrozenInstanceError): s.y = 5 + with self.assertRaises(FrozenInstanceError): + s.z = 5 self.assertEqual(s.x, 3) self.assertEqual(s.y, 10) - self.assertEqual(s.cached, True) + self.assertEqual(s.z, 2) + self.assertIs(s.cached, False) with self.assertRaises(FrozenInstanceError): del s.x @@ -3363,11 +3428,26 @@ class S(D): with self.assertRaises(FrozenInstanceError): del s.y self.assertEqual(s.y, 10) + with self.assertRaisesRegex( + AttributeError, + 'object has no deleter', + ) as cm: + del s.readonly + self.assertNotIsInstance(cm.exception, FrozenInstanceError) + self.assertEqual(s.x, 3) + self.assertEqual(s.readonly, 3) del s.cached self.assertNotHasAttr(s, 'cached') - with self.assertRaises(AttributeError) as cm: + with self.assertRaisesRegex( + AttributeError, + "object has no attribute 'cached'", + ) as cm: del s.cached self.assertNotIsInstance(cm.exception, FrozenInstanceError) + del s.prop + self.assertEqual(s.z, 0) + self.assertEqual(s.prop, 0) + del s.prop def test_non_frozen_normal_derived_from_empty_frozen(self): @dataclass(frozen=True) _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3//lists/python-checkins.python.org Member address: [email protected]
