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learning10.py
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#!usr/bin/env python3
#_*_ coding: utf-8 _*_
"a test class";
__author__ = "Jacky Yuan";
#多继承
#由于Python允许使用多重继承,因此,MixIn就是一种常见的设计。
#只允许单一继承的语言(如Java)不能使用MixIn的设计。
#基类
class Animal(object):
pass
#哺乳动物
class Mammal(Animal):
pass
#蛋类动物
class Bird(Animal):
pass
class Dog(Mammal):
pass
class Parrot(Bird):
pass
class Ostrich(Bird):
pass
class Runnable(object):
def run(self):
print("Running...");
class Flyable(object):
def fly(self):
print("Flying...");
#蝙蝠,哺乳动物并且会飞
class Bat(Mammal, Flyable):
pass
bat = Bat();
print(bat.fly());
#在设计类的继承关系时,通常,主线都是单一继承下来的,
#例如,Ostrich继承自Bird。但是,如果需要“混入”额外的功能,
#通过多重继承就可以实现,比如,让Ostrich除了继承自Bird外,
#再同时继承Runnable。 这种设计通常称之为MixIn。
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