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1ded8a2977
Per https://docs.python.org/3/reference/expressions.html#membership-test-operations For user-defined classes which define the contains() method, x in y returns True if y.contains(x) returns a true value, and False otherwise. Fixes issue #7884.
48 lines
788 B
Python
48 lines
788 B
Python
# A contains everything
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class A:
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def __contains__(self, key):
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return True
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a = A()
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print(True in a)
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print(1 in a)
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print(() in a)
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# B contains given things
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class B:
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def __init__(self, items):
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self.items = items
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def __contains__(self, key):
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return key in self.items
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b = B([])
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print(1 in b)
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b = B([1, 2])
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print(1 in b)
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print(2 in b)
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print(3 in b)
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class C:
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def __contains__(self, arg):
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return arg
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print(C().__contains__(0))
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print(C().__contains__(1))
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print(C().__contains__(''))
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print(C().__contains__('foo'))
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print(C().__contains__(None))
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print(0 in C())
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print(1 in C())
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print('' in C())
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print('foo' in C())
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print(None in C())
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print(0 not in C())
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print(1 not in C())
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print('' not in C())
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print('foo' not in C())
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print(None not in C())
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