python之子类调用父类方法

class Vehicle:
    def __init__(self,name,speed,load):
        self.Name=name
        self.Speed=speed
        self.Load=load
    def  running(self):
         print('%s时速为%s'%(self.Name,self.Speed))
class Subway(Vehicle):
    def __init__(self, name, speed, load,line):
        super().__init__(name,speed,load)
        self.Line=line
    def show_info(self):
        super().running(self)
        print(self.Name,'是',self.Line)
line1=Subway('北京地铁','100km/h',1000,'2号线')
line1.show_info()

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北京地铁时速为100km/h
北京地铁 是 2号线