21 lines
448 B
Python
21 lines
448 B
Python
class NotAdder:
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def __init__(self):
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self.i = 0
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def __add__(self, other):
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return NotImplemented
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class Adder:
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def __init__(self):
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self.i = 1
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def __add__(self, other: NotAdder):
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return self.i + other.i
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def __radd__(self, other: NotAdder):
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return self.i + other.i
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if __name__ == '__main__':
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na = NotAdder()
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a = Adder()
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na + a
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# if a + na => NotImplemented then
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# na.__radd__(a) |