总感觉搜到的不对劲，和题目有点不一样

class Animal:
    def __init__(self, clr='gray'):
        self.color = clr

    def call(self):
        print("color: ", self.color)
        print("Animal call")

class Fish(Animal):
    def __init__(self, clr="green"):
        Animal.__init__(self, clr) 
        self.tail = 'tail'

    def call(self):
        print("color: ", self.color)
        print("Fish call")


if __name__=='__main__':
    a = Animal()
    a.call()
    fish = Fish()
    fish.call()