寫一個小練習，定義好一個類，每初始化一次，計數器+1，統計最後次數.

class OldboyStudent:
    school = ‘oldboy‘
    count=0
    def __init__(self,name,age,sex):
        self.name=name
        self.age=age
        self.sex=sex
        OldboyStudent.count+=1
    def learn(self):
        print(‘%s is learning‘  %self.name)

    def eat(self):
        print(
 
‘is eating‘)

obj1=OldboyStudent(‘李大炮‘,18,‘女‘)
obj2=OldboyStudent(‘張全蛋‘,28,‘男‘)
obj3=OldboyStudent(‘牛榴彈‘,18,‘女‘)
print(OldboyStudent.count)

寫一個小程序，能夠實現類之間的類的交互：

eg：例如LOL的英雄，互相攻擊，交互剩余血量的問題

 1 class Garen:
 2     camp=‘Demacia‘
 3     def __init__(self,nickname,life_value=100,aggresivity=80):
 4         self.nickname=nickname
 5         self.life_value=life_value
 6         self.aggresivity=aggresivity
 7     def attack(self,enemy):
 8         enemy.life_value-=self.aggresivity　　#敵人的血等於敵人的生命值減去我的攻擊力
 9 
10 class Riven:
11     camp = ‘Noxus‘
12     def __init__(self, nickname, life_value=80, aggresivity=100):
13         self.nickname = nickname
14         self.life_value = life_value
15         self.aggresivity = aggresivity
16 
17     def attack(self, enemy):
18         enemy.life_value -= self.aggresivity
19 
20 
21 g1=Garen(‘草叢猥瑣男‘)
22 r1=Riven(‘兔女郎‘)
23 
24 print(r1.life_value)
25 g1.attack(r1)
26 print(r1.life_value)
 

Day7 小練習（統計初始化數據的次數和對象之間的交互）