组合

#组合：用来做类与类之间的关联
例如以下实例：
class Play_football:
    print('正在打篮球')
class Play_baskerball:
    print('正在踢足球')
class Play_volleyball:
    print('正在打排球')

class Person_Play:
    def __init__(self,name):
        self.name = name
        self.Play_football = Play_football()
        self.Play_baskerball = Play_baskerball()
        self.Play_vollerball = Play_volleyball ()
        print('这是%s的游戏'%self.name)
p1 = Person_Play('小明')