# 组合： 组合就是把类和类链接起来，#实例操作;学校 老师 课程建立关系class School: def __init__(self,name,addr): self.name=name, self.addr=addrclass Teach: def __init__(self,name,zhiji): self.ID=name , self.zhiji=zhijiclass Kecheng: def __init__(self,name,keshi,jiage,school,teach): self.keshi=keshi, self.neirong=jiage, self.name=name, self.school=school, self.teach=teachs1= School("清华","北京")s2= School("清华","北京1")s3= School("清华","北京3")msg="""1 清华 北京校区2 清华 北京1校区3 清华 北京2校区"""menu={ "1":s1, "2":s2, "3":s3}choice=input("选择学校>>>>:")school=menu[choice]#实例化学校name=input("课程名>>>>:")keshi=input("课时>>>>:")jiage=input("价格>>>>:")t1= Teach("张三","40000")t2= Teach("李四","7000")t3= Teach("李四","7000")laoshi={ "1":t1, "2":t2, "3":t3}choice1=input("选择老师>>>>:")teach=menu[choice1]#实例化老师#课程和学校关系new_kecheng=Kecheng(name,keshi,jiage,school,teach)print("课程【%s】属于【%s】学校"%(new_kecheng.name,new_kecheng.school.name))#老师关联学校 课时new_kecheng1=Kecheng(name,keshi,jiage,school,teach)print("【%s】老师在【%s】学校上【%s】课程"%(new_kecheng1.teach.ID,new_kecheng1.school.name,new_kecheng1.name))
来源：https://www.cnblogs.com/jianchixuexu/p/11664304.html