类中的组合：大类中包含着小类,作用：类与类之间做关联

class Hand:    passclass Foot:    passclass Head:    passclass Person:    def __init__(self,name):        self.name=name        self.hand=Hand()#实例化        self.foot=Foot()#实例化        self.head=Head()#实例化p1=Person('sxj')print(p1.__dict__)

 

class School:    def __init__(self,name,addr):        self.name=name        self.addr=addr    def zhao_sheng(self):        print('%s在招生'%self.name)class Course:    def __init__(self,name,price,time,school):        self.name=name        self.price=price        self.time=time        self.school=schools1=School('oldboy','sh')s2=School('oldboy','bj')s3=School('oldboy','dj')c1=Course('linux',10,'1h',s1)#上海校区linux课程menu={    '1':s1,    '2':s2,    '3':s3,}msg='' \    '1 oldboy  sh  \n' \    '2 oldboy  bj   \n' \    '3 oldboy  dj   \n'while True:    print(msg) #输入提示信息    choice=input('请输入：')    school_obj=menu[choice]    name=input('课程名字>>>>')    price=input('money>>>>')    time=input('课程时间>>>>')    new_course=Course(name,price,time,school_obj)    print(new_course.__dict__)    print('课程名字［%s］属于［%s］学校'%(new_course.name,new_course.school.name))

》》》》》》

1 oldboy sh

2 oldboy bj

3 oldboy dj

请输入：3

课程名字>>>>python

money>>>>5yuan

课程时间>>>>1h

{'name': 'python', 'price': '5yuan', 'time': '1h', 'school': <__main__.School object at 0x102198f98>}

课程名字［python］属于［oldboy］学校