1.类的定义

class Car(object):
    name = 'BMW'
    def __init__(self, name):
        self.name = name
    @classmethod
    def run(cls,speed):
        print(cls.name,speed,'行驶')
# 访问方式1
c = Car("宝马")
c.run("100km/h")
# 访问方式2
Car.run("100km/h")

2.类的继承

class Car(object):
    name = 'BMW'

    def __init__(self, name):
        self.name = name

    def run(self, speed):
        print(self.name, speed, '行驶')


# 子类
class BMWCar(Car):
    conf = "经济适用型"
    pass


# 调用父类 Car 中 run 方法
bc = BMWCar("BMW经济适用型轿车")
bc.run("100km/h")

3.类的多态

# 父类
class Car(object):
    name = 'BMW'
    def __init__(self, name):
        self.name = name
    def run(self,speed):
        print('Car-->',self.name,speed,'行驶')

# 子类1
class BMWCar(Car):
    def run(self,speed):
        print('BMWCar-->',self.name,speed,'行驶')

# 子类2
class SVWCar(Car):
    def run(self,speed):
        print('SVWCar-->',self.name,speed,'行驶')

# 调用 run 方法
c = Car("Car")
c.run("120km/h")

bc = BMWCar("宝马")
bc.run("100km/h")

sc = SVWCar("大众")
sc.run("80km/h")

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