Python多继承

 # -*- coding: utf-8 -*-
 """
 Created on Tue Nov 13 16:56:03 2018

 @author: zhen
 """
 class Machine:
     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

 class Aricraft(Machine):
     def fly(self, miles):
         Aricraft.mileages += miles
         print("the aircrift has", Aricraft.mileages, "miles")

 class Tank(Machine):
     def travel(self, miles):
         Tank.mileages += miles
         print("the tank has", Tank.mileages, "miles")

 aricraft = Aricraft("涡扇9", "800km/h")
 aricraft.fly(600)
 tank = Tank("V8缸涡轮增压", "120km/h")
 tank.travel(300)

 class Fighter(Aricraft,Tank): # 多继承，尽量避免多个父类存在相同函数的情况
     def __missile(self): # 私有方法，只能类内访问
         print("emission missile and shell !")
     def fly(self, miles):
         Aricraft.mileages += miles
         print("the fighter has fly", Aricraft.mileages, "miles")
         Fighter.__missile(self)
     def travel(self, miles):
         Tank.mileages += miles
         print("the fighter has travel", Tank.mileages, "miles")

 fighter = Fighter("涡扇15", "1200km/h")
 fighter.fly(1800)
 fighter.travel(600)
 # 查看类继承顺序
 print(Fighter.__mro__) # object是所有类的基类

结果：