Python多态

 1 # -*- coding: utf-8 -*-
 2 """
 3 Created on Thu Nov 15 10:34:25 2018
 4 
 5 @author: zhen
 6 """
 7 
 8 class Aricraft:
 9     mileages = 0.0 # 类变量，在该类及其子类的实例中共享
10     def __init__(self, engine, speed):
11         self.engine = engine
12         self.speed = speed
13     def fly(self):
14         Aricraft.mileages += float(self.speed)
15         print("the aircrift has", Aricraft.mileages, "miles")
16         
17 class Fighter(Aricraft): # 继承
18     def __missile(self): # 私有方法，只能类内访问
19         print("emission missile !")
20         
21     def fly(self):
22         Aricraft.mileages += float(self.speed)
23         print("the fighter has", Aricraft.mileages, "miles")
24         Fighter.__missile(self)
25         
26 def indication(obj): # 多态，动态执行
27     obj.fly()
28    
29 aricraft = Aricraft("涡扇10", "800")
30 fighter = Fighter("涡扇15", "1200")
31 
32 indication(aricraft)
33 indication(fighter)
结果：