Python多继承

 1 # -*- coding: utf-8 -*-
 2 """
 3 Created on Tue Nov 13 16:56:03 2018
 4 
 5 @author: zhen
 6 """
 7 class Machine:
 8     mileages = 0.0 # 类变量，在该类及其子类的实例中共享
 9     def __init__(self, engine, speed):
10         self.engine = engine
11         self.speed = speed
12         
13 class Aricraft(Machine):
14     def fly(self, miles):
15         Aricraft.mileages += miles
16         print("the aircrift has", Aricraft.mileages, "miles")
17         
18 class Tank(Machine):
19     def travel(self, miles):
20         Tank.mileages += miles
21         print("the tank has", Tank.mileages, "miles")
22         
23 aricraft = Aricraft("涡扇9", "800km/h")
24 aricraft.fly(600)
25 tank = Tank("V8缸涡轮增压", "120km/h")
26 tank.travel(300)
27 
28 class Fighter(Aricraft,Tank): # 多继承，尽量避免多个父类存在相同函数的情况
29     def __missile(self): # 私有方法，只能类内访问
30         print("emission missile and shell !")
31     def fly(self, miles):
32         Aricraft.mileages += miles
33         print("the fighter has fly", Aricraft.mileages, "miles")
34         Fighter.__missile(self)        
35     def travel(self, miles):
36         Tank.mileages += miles
37         print("the fighter has travel", Tank.mileages, "miles")
38         
39 fighter = Fighter("涡扇15", "1200km/h")
40 fighter.fly(1800)
41 fighter.travel(600)
42 # 查看类继承顺序
43 print(Fighter.__mro__) # object是所有类的基类

结果：