python面向对象 格式很重要

class Vehicle:
    def __int__(self,speed):
        self.speed=speed

        def drive(self,distance):
            print 'need %f hour(s)'%(distance/self.speed)

class Bike(Vehicle):
    pass
class Car(Vehicle):
    def __init__(self,speed,fuel):
        Vehicle.__int__(self,speed)
        self.fuel=fuel

    def drive(self,distance):
        Vehicle.drive(self,distance)
        print 'need %f fules'%(distance*self.fuel)


        b=Bike(15.0)
        c=Car(80.0,0.012)
        b.drive(100.0)
        c.drive(100.0)

　　

class Vehicle:
        def __init__(self,sudu):
            self.sudu =sudu

        def drive(self,distance):
            print 'need %f hour(s)'%(distance/self.sudu)

class Bike(Vehicle):
    pass
class Car(Vehicle):
    def __init__(self, speed, fuel):
        Vehicle.__init__(self, speed)
        self.fuel = fuel

    def drive(self, distance):
        Vehicle.drive(self, distance)
        print 'need %f fuels' % (distance * self.fuel)
b=Bike(10.0)
b.drive(100.0)
c=Car(80.0,0.012)
c.drive(100.0)

　　不是格式问题 上面代码 init 写成了int 写代码一定要细心