class Vehicle:     Country='China'     def __init__(self,name,speed,load,power):         self.name=name         self.speed=speed         self.load=load         self.power=power     def run(self):         print('开动啦')         print('开动啦') class Subway(Vehicle):         def __init__(self,name,speed,load,power,line):            Vehicle.__init__(self,name,speed,load,power)#相当于把父类初始化函数全部复制过来            self.line=line         def show_info(self):#派生的             print(self.name,self.speed,self.load,self.power,self.line)         def run(self):             Vehicle.run(self)             print('%s %s 线，开动啦' %(self.name,self.line)) line13=Subway('北京地铁','10km/s',1000000000,'电',13) # line13.show_info() line13.run()

北京地铁 10km/s 1000000000 电 13

开动啦

开动啦

北京地铁 13 线，开动啦