Python类继承，方法重写及私有方法

 1 # -*- coding: utf-8 -*-
 2 """
 3 Created on Mon Nov 12 15:05:20 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, miles):
14         Aricraft.mileages += miles
15         print("the aircrift has", Aricraft.mileages, "miles")
16         
17 aricraft = Aricraft("涡扇9", "800km/h")
18 aricraft.fly(1000)
19 aricraft.fly(600)
20 
21 class Fighter(Aricraft): # 继承
22     def __missile(self): # 私有方法，只能类内访问
23         print("emission missile !")
24         
25     def fly(self, miles):
26         Aricraft.mileages += miles
27         print("the fighter has", Aricraft.mileages, "miles")
28         Fighter.__missile(self)
29    
30 fighter = Fighter("涡扇15", "1200km/h")
31 fighter.fly(1800)
32 fighter.fly(1600)
33 # fighter.__missile()  AttributeError: 'Fighter' object has no attribute '__missile'
34
结果：