Python---多态

多态:多种状态,即完成某个行为时,使用不同的对象会得到不同的状态 (以父类做定义声明,以子类做实际工作)

抽象类(接口):含有抽象方法称为抽象类
抽象方法:方法体是空实现的(pass)称为抽象方法

# Animal为抽象类
class Animal:
    def speak(self):
        pass
 
 
class Dog:
    def speak(self):
        print("汪汪汪")
 
 
class Cat:
    def speak(self):
        print("喵喵喵")
 
 
def make_noise(animal: Animal):
    animal.speak()
 
 
dog = Dog()
cat = Cat()
 
make_noise(dog)
make_noise(cat)
 
 
 
# AC 为抽象类
class AC:
    def cool_wind(sel):
        pass
 
    def hot_wind(sel):
        pass
 
    def swing_l_r(sel):
        pass
 
 
class Midea_AC(AC):
    def cool_wind(sel):
        print("美的制冷")
 
    def hot_wind(sel):
        print("美的制热")
 
    def swing_l_r(sel):
        print("美的左右摆动")
 
 
class GREE_AC(AC):
    def cool_wind(sel):
        print("格力制冷")
 
    def hot_wind(sel):
        print("格力制热")
 
    def swing_l_r(sel):
        print("格力左右摆动")
 
 
def make_cool(ac: AC):
    ac.cool_wind()
 
 
midea_ac = Midea_AC()
gree_ac = GREE_AC()
 
make_cool(midea_ac)
make_cool(gree_ac)