Python----面向对象--派生

派生是指子类可以有自己的特有属性，示例代码如下：

class Hero:
    def __init__(self, nick_name, life_value, aggresivity):
        self.nick_name = nick_name
        self.life_value = life_value
        self .aggresivity = aggresivity

    def attack(self, enemy):
        enemy.life_value -= self.aggresivity


class Garen(Hero):
    camp = 'Demacia'


class Riven(Hero):
    camp = 'Noxus'


g1 = Garen('草丛伦', 100, 30)
print(g1.camp)

结果为：

Demacia

从结果可以看出，能够访问g1的特有属性camp

派生属性并不影响正常代码执行：

class Hero:
    def __init__(self, nick_name, life_value, aggresivity):
        self.nick_name = nick_name
        self.life_value = life_value
        self .aggresivity = aggresivity

    def attack(self, enemy):
        enemy.life_value -= self.aggresivity


class Garen(Hero):
    camp = 'Demacia'


class Riven(Hero):
    camp = 'Noxus'


g1 = Garen('草丛伦', 100, 30)
r1 = Riven('锐雯雯', 80, 50)
g1.attack(r1)
print(r1.life_value)

结果为：
50

在Garen类中添加一个attack函数，会发生什么变化

class Hero:
    def __init__(self, nick_name, life_value, aggresivity):
        self.nick_name = nick_name
        self.life_value = life_value
        self .aggresivity = aggresivity

    def attack(self, enemy):
        enemy.life_value -= self.aggresivity


class Garen(Hero):
    camp = 'Demacia'

    def attack(self, enemy):
        print('from Garen class')


class Riven(Hero):
    camp = 'Noxus'


g1 = Garen('草丛伦', 100, 30)
r1 = Riven('锐雯雯', 80, 50)
g1.attack(r1)
# print(r1.life_value)

结果为：
from Garen class

以上结果说明，属性的查找顺序为对象自身，所属类中依次去查找