在子类中重用父类的属性

Posted 2020-10-27 Mr。yang

在子类中派生出新的方法重用父类的方法，有两种实现方式

方式一：指名道姓(不依赖继承)

 

class Hero:
    def __init__(self,name,damage,zing):
        self.name = name
        self.damage = damage
        self.zing = zing

    def attack(self,enemy):
        enemy.zing -= self.damage

class Yang(Hero):
    def attack(self,enemy):
        Hero.attack(self,enemy) #指名道姓的重用方法，可以在非继承的情况下使用
        print("from Yang Class")
    pass

class Lin(Hero):
    pass

g1 = Yang(‘杨学伟‘,100,100)
r1 = Lin(‘林书行‘,100,200)

print(r1.zing)
g1.attack(r1)
print(r1.zing)

函数属性的重用

 

__init__方法的重用

方式二：super(依赖继承)

 

class Hero:
    def __init__(self,name,damage,zing):
        self.name = name
        self.damage = damage
        self.zing = zing

    def attack(self,enemy):
        enemy.zing -= self.damage

class Yang(Hero):
    def attack(self,enemy):
        super(Yang,self).attack(enemy) #super(Yang,self)是一个对象 ，依赖于继承
        print("from Yang Class")
    pass

class Lin(Hero):
    pass

g1 = Yang(‘杨学伟‘,100,100)
r1 = Lin(‘林书行‘,100,200)

print(r1.zing)
g1.attack(r1)
print(r1.zing)

函数属性的重用

 

class Hero:
    def __init__(self,name,damage,zing):
        self.name = name
        self.damage = damage
        self.zing = zing
    def attack(self,enemy):
        enemy.zing -= self.damage

class Yang(Hero):
    def __init__(self,name,damage,zing,weapon):
        # self.name = name
        # self.damage = damage
        # self.zing = zing
        # Hero.__init__(self,name,damage,zing)
        super(Yang,self).__init__(name,damage,zing) #super是一个对象，所以再绑定方法的时候不用加第一个参数
        self.weapon = weapon

    def attack(self,enemy):
        Hero.attack(self,enemy) #指名道姓的重用方法，可以在非继承的情况下使用
        print("from Yang Class")
    pass

g1 = Yang(‘杨学伟‘,100,100,‘圣剑‘)
print(g1.__dict__)

__init__方法的重用

super练习

#super
class A:
    def f1(self):
        print("from A")
        super(A,self).f1() #super是基于C类的mro往后面寻找,而不A类的mro，所以可以去绑定B类的f1方法

class B:
    def f1(self):
        print("from B")

class C(A,B):
    pass

c = C()
c.f1()
# print(C.mro())