python练习题-day23

　　1、人狗大战（组合）

class Person:
    def __init__(self,name,hp,aggr,sex,money):
        self.name=name
        self.hp=hp
        self.aggr=aggr
        self.sex=sex
        self.money=money
    def atta(self,dog):
        dog.hp-=self.aggr
    def get_weapon(self,weapon):
        if self.money>=weapon.price:
            self.money-=weapon.price
            self.weapon=weapon
            print("购买成功")
            self.aggr+=weapon.aggr
        else:
            print("金币不足，无法购买")
class Dog:
    def __init__(self,name,hp,aggr,kind):
        self.name=name
        self.hp=hp
        self.aggr=aggr
        self.kind=kind
    def bite(self,person):
        person.hp-=self.aggr
class Weapon:
    def __init__(self,name,aggr,price,count):
        self.name=name
        self.aggr=aggr
        self.price=price
        self.count=count
    def dazhao(self,dog):
        if self.count>0:
            dog.hp-=self.aggr*2
            self.count-=1
        else:
            print("大招使用次数已达上限")
pis=Person("pis",100,10,"male",10000)
naix=Dog("naix",600,100,"ghost")
sj=Weapon("圣剑",300,6200,1)
pis.get_weapon(sj)
print(pis.aggr)
pis.atta(naix)
print(naix.hp)
pis.weapon.dazhao(naix)
print(naix.hp)
pis.weapon.dazhao(naix)

 2、计算环的面积和周长（组合）

#面向对象编程
import math
class Circle:
    def __init__(self,r):
        self.radius=r
    def area(self):
        return math.pi*(self.radius**2)
    def perimeter(self):
        return math.pi*(2*self.radius)
class Ring:
    def __init__(self,r1,r2):
        self.outside=Circle(r1)
        self.inside=Circle(r2)
    def area(self):
         return self.outside.area()-self.inside.area()
    def perimeter(self):
         return self.outside.perimeter()+self.inside.perimeter()
ring=Ring(20,10)
print(ring.area())
print(ring.perimeter())