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If using a frozen class with slots, add __getstate__ and __setstate__ to set the instance values. (GH-25786)

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Eric V. Smith 2021-05-01 13:27:30 -04:00 • committed by GitHub
parent f82fd77717
commit 823fbf4e0e
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2 changed files with 34 additions and 2 deletions
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13
Lib/test/test_dataclasses.py
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@ -2833,6 +2833,19 @@ class TestSlots(unittest.TestCase):
self.assertFalse(hasattr(A, "__slots__"))
self.assertTrue(hasattr(B, "__slots__"))
# Can't be local to test_frozen_pickle.
@dataclass(frozen=True, slots=True)
class FrozenSlotsClass:
foo: str
bar: int
def test_frozen_pickle(self):
# bpo-43999
assert self.FrozenSlotsClass.__slots__ == ("foo", "bar")
p = pickle.dumps(self.FrozenSlotsClass("a", 1))
assert pickle.loads(p) == self.FrozenSlotsClass("a", 1)
class TestDescriptors(unittest.TestCase):
def test_set_name(self):