Python多态

# -*- coding: utf-8 -*-
"""
Created on Thu Nov 15 10:34:25 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):
        Aricraft.mileages += float(self.speed)
        print("the aircrift has", Aricraft.mileages, "miles")
        
class Fighter(Aricraft): # 继承
    def __missile(self): # 私有方法，只能类内访问
        print("emission missile !")
        
    def fly(self):
        Aricraft.mileages += float(self.speed)
        print("the fighter has", Aricraft.mileages, "miles")
        Fighter.__missile(self)
        
def indication(obj): # 多态，动态执行
    obj.fly()
   
aricraft = Aricraft("涡扇10", "800")
fighter = Fighter("涡扇15", "1200")

indication(aricraft)
indication(fighter)

结果：