鸭子类型

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class Duck: 
@classmethod
def fly(cls):
print("Duck flying")


class Airplane:
@staticmethod
def fly():
print("Airplane flying")

class Bird:
def fly(self):
print('Bird is flying')


def lift_off(entity):
entity.fly()

if __name__ == "__main__":
lift_off(Duck)
lift_off(Airplane)
bird = Bird()
lift_off(bird)