【Python 第50课】 面向对象（4）

l0ve1o24

class Car(Vehicle):
    def __init__(self, speed, fuel):
        Vehicle.__init__(self, speed)
        self.fuel = fuel
老师，这段里Vehicle.__init__(self, speed) 改成self.speed = speed
好像更好理解

1. class Vehicle:
   
2.     def __init__(self, speed):
   
3.         self.speed = speed
   
4. 
   
5.     def drive(self, distance):
   
6.         print 'need %f hour(s)' % (distance / self.speed)
   
7. 
   
8. class Bike(Vehicle):
   
9.     pass
   
10. 
    
11. class Car(Vehicle):
    
12.     def __init__(self, speed, fuel):
    
13.         self.speed = speed
    
14.         self.fuel = fuel
    
15. 
    
16.     def drive(self, distance):
    
17.         Vehicle.drive(self, distance)
    
18.         print 'need %f fuels' % (distance * self.fuel)
    
19. 
    
20. b = Bike(15.0)
    
21. c = Car(80.0, 0.012)
    
22. b.drive(100.0)
    
23. c.drive(100.0)
    

复制代码

l0ve1o24

crossin先生 发表于 2017-1-12 17:45
效果一样，但你这个就没有调用父类方法了。等于完全抛弃了原有的代码

恩，谢谢老师