bpo-32892: Support subclasses of base types in isinstance checks for AST constants. (GH-9934)
Some projects (e.g. Chameleon) create ast.Str containing an instance of the str subclass.
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@ -346,7 +346,7 @@ class _ABC(type):
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except AttributeError:
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return False
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else:
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return type(value) in _const_types[cls]
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return isinstance(value, _const_types[cls])
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return type.__instancecheck__(cls, inst)
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def _new(cls, *args, **kwargs):
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@ -399,6 +399,10 @@ class AST_Tests(unittest.TestCase):
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self.assertFalse(isinstance(ast.Constant(), ast.NameConstant))
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self.assertFalse(isinstance(ast.Constant(), ast.Ellipsis))
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class S(str): pass
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self.assertTrue(isinstance(ast.Constant(S('42')), ast.Str))
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self.assertFalse(isinstance(ast.Constant(S('42')), ast.Num))
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def test_subclasses(self):
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class N(ast.Num):
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def __init__(self, *args, **kwargs):
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