Python类继承，方法重写及私有方法

 # -*- coding: utf-8 -*-
 """
 Created on Mon Nov 12 15:05:20 2018

 @author: zhen
 """

 class Aricraft:
     mileages = 0.0 # 类变量，在该类及其子类的实例中共享
     def __init__(self, engine, speed):
         self.engine = engine
         self.speed = speed
     def fly(self, miles):
         Aricraft.mileages += miles
         print("the aircrift has", Aricraft.mileages, "miles")

 aricraft = Aricraft("涡扇9", "800km/h")
 aricraft.fly(1000)
 aricraft.fly(600)

 class Fighter(Aricraft): # 继承
     def __missile(self): # 私有方法，只能类内访问
         print("emission missile !")

     def fly(self, miles):
         Aricraft.mileages += miles
         print("the fighter has", Aricraft.mileages, "miles")
         Fighter.__missile(self)

 fighter = Fighter("涡扇15", "1200km/h")
 fighter.fly(1800)
 fighter.fly(1600)
 # fighter.__missile()  AttributeError: 'Fighter' object has no attribute '__missile'
     

结果：