类的组合用法

类的组合用法

class Turtle:
    def __init__(self, x):
        self.num = x


class Fish:
    def __init__(self, y):
        self.num = y


class Pool:
    def __init__(self, x, y):
        # 通过调用Turtle类、Fish类来形成组合
        self.turtle = Turtle(x)
        self.fish = Fish(y)

    def printnum(self):
        print('水池里共有%d只乌龟，%d条鱼' % (self.turtle.num, self.fish.num))


p = Pool(6, 8)
p.printnum()