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)