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bpo-39942:Fix failure in TypeVar when missing __name__ (GH-19616)

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https://bugs.python.org/issue39942
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HongWeipeng 2020-04-21 04:01:53 +08:00 • committed by GitHub
parent eba9f6155d
commit a25a04fea5
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3 changed files with 13 additions and 1 deletions
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7
Lib/test/test_typing.py
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@ -221,6 +221,13 @@ class TypeVarTests(BaseTestCase):
with self.assertRaises(TypeError):
TypeVar('X', str, float, bound=Employee)
def test_missing__name__(self):
# See bpo-39942
code = ("import typing\n"
"T = typing.TypeVar('T')\n"
)
exec(code, {})
def test_no_bivariant(self):
with self.assertRaises(ValueError):
TypeVar('T', covariant=True, contravariant=True)