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tests/basics: Add test for containment of a subclass of a native type.
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‎tests/basics/subclass_native_containment.py‎

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# test containment operator on subclass of a native type
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class mylist(list):
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pass
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class mydict(dict):
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pass
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class mybytes(bytes):
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pass
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l = mylist([1, 2, 3])
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print(0 in l)
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print(1 in l)
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d = mydict({1:1, 2:2})
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print(0 in l)
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print(1 in l)
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b = mybytes(b'1234')
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print(0 in b)
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print(b'1' in b)

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