面向对象-对象的组合

#组合
#一个类的实例可以当做参数传给另一个类的实例
# class School:
#     def __init__(self,name,address):
#         self.name=name
#         self.address=address
# class Course:
#     def __init__(self,name,price,outline,school):
#         self.name=name
#         self.price=price
#         self.outline=outline
#         self.school=school
# cour=Course('lxx',1000,'6mons',School('老男孩','北京'))
# print(cour.name,cour.school.name,cour.school.address)

#一个类的对象，可以当做另一个类的属性，放入__init__方法中
# class School:
#     def inform(self):
#         print('校运动会。。。')
# class Course:
#     def __init__(self,name,price,outline):
#         self.name=name
#         self.price=price
#         self.outline=outline
#         self.school=School()#给班级绑定一个学校
# cour=Course('lxx',1000,'6mons')
# cour.school.inform()#school的技能，cour可以直接调用

#求环的面积周长，用到园的面积周长
class Circle:
    def __init__(self,r):
        self.r=r
    def area(self):
        return 3.14*self.r**2
    def perimeter(self):
        return 2*3.14*self.r
class Ring:
    def __init__(self,out_r,in_r):
        self.out_circle=Circle(out_r)
        self.in_circle=Circle(in_r)
    def area(self):
        return(self.out_circle.area()-self.in_circle.area())
    def perimeter(self):
        return(self.out_circle.perimeter()+self.in_circle.perimeter())
print(Ring(3,2).area(),Ring(5,2).perimeter())

#人狗大战完整代码
class Person:
    def __init__(self,name,life_value,aggressivity,money):
        self.name=name
        self.aggressivity=aggressivity
        self.life_value=life_value
        self.money=money
    def attack(self,dog):
        dog.life_value-=self.aggressivity
class Dog:
    def __init__(self,name,breed,life_value,aggressivity):
        self.name=name
        self.breed=breed
        self.aggressivity=aggressivity
        self.life_value=life_value
    def bite(self,person):
        person.life_value-=self.aggressivity
class Weapon:
    def __init__(self,name,life_value,aggrev,price):
        self.name=name
        self.price=price
        self.aggrev=aggrev
        self.life_value=life_value
    def update(self,person):
        person.aggressivity+=self.aggrev
        person.life_value+=self.life_value
        person.money-=self.price
    def prick(self,dog):
        dog.life_value-=self.aggrev
lance=Weapon('肉包子',222,333,400)
alex=Person('alex',500,200,300)
ha2=Dog('二哈','哈士奇',500,1000)

alex.attack(ha2)
print(alex.life_value,ha2.life_value)

lance.update(alex)
print(alex.life_value,alex.aggressivity,alex.money)

lance.prick(ha2)
print(ha2.life_value)