14 组合

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1. 组合：在python中其实很简单，直接把需要的类放进去实例化就可
2. 案例

class Turtle:
    def __init__(self, x):
        self.num = x
class Fish:
    def __init__(self, x):
        self.num = x
class Pool:
    def __init__(self, x, y):
        self.turtle = Turtle(x)
        self.fish = Fish(y)

    def print_num(self):
        print("水池里总过有乌龟%d只，小鱼%d条T_T" % (self.turtle.num, self.fish.num))
pool = Pool(1, 10)
pool.print_num()
#水池里总过有乌龟1只，小鱼10条T_T