老生常谈python之鸭子类和多态

<1>通过继承实现多态（子类可以作为父类来使用）<2>子类通过重载父类的方法实现多态class Animal:  def move(self):    print('animal is moving....')class Dog(Animal):  passdef move(obj):  obj.move()>>>move(Animal())>>>animal is moving....>>>move(Dog())>>>animal is moving....class Fish(Animal):  def move(self):    print('fish is moving....')>>>move(Fish())>>>fish is moving....

class P:  def __init__(self, x, y):    self.x = x    self.y = y  def __add__(self, oth):    return P(self.x+oth.x, self.y+oth.y)  def info(self):    print(self.x, self.y)class D(P):  def __init__(self, x, y, z):    super.__init__(x, y)    self.z = z  def __add__(self, oth):    return D(self.x+oth.x, self.y+oth.y, self.z+oth.z)  def info(self):    print(self.x, self.y, self.z)class F:  def __init__(self, x, y, z):    self.x = x    self.y = y    self.z = z  def __add__(self, oth):    return D(self.x+oth.x, self.y+oth.y, self.z+oth.z)    def info(self):    print(self.x, self.y, self.z)  def add(a, b):  return a + bif __name__ == '__main__':  add(p(1, 2), p(3, 4).info())  add(D(1, 2, 3), D(1, 2, 3).info())  add(F(2, 3, 4), D(2, 3, 4).info())