"""
多继承

"""


class Animal(object):
    pass


# 大类:
class Mammal(Animal):
    pass


class Bird(Animal):
    pass


class Runnable(object):
    def run(self):
        print('Running...')


class Flyable(object):
    def fly(self):
        print('Flying...')


# 具体类
class Dog(Mammal, Runnable):
    pass


class Bat(Mammal, Flyable):
    pass
