如何使用 Mixin 类为 Python 中的多个类提供方法

Question

我正在尝试了解如何在python中使用mixins。我想让鸟、狗和蝙蝠类具有PetMixIn类中的eat方法，但也可以是自我实例。我应该怎么做？

class Pet(object):
    def __init__(self, food):
        self.food = food
    def eat(self):
        print(f'Eatting...{self.food}')
class PetMixIn(object):
    def eat(self):
        print('Eatting...')
class Animal(object):
    def __init__(self, life):
        self.liferange = life
class Bird(Animal):
    def __init__(self, life, flyable):
        super.__init__(lift)
        self.flyable = flyable
    #bird attribution ...
class Dog(Animal):
    def __init__(self, life, name):
        super.__init__(lift)
        self.name = name
    #dog attribution ...
class Bat(Animal):
    def __init__(self, life, size):
        super.__init__(lift)
        self.size = size
    #bat attribution ...
bat = Bat(40, '1')
dog = Dog(10, 'tom')
bird = Bird(3, True)

Answer 1

这里有一个小例子(python3(

class PetMixIn:
    xxx = 2
    def eat(self):
        print('Eatting...')
class Animal:
    def __init__(self, life):
        self.liferange = life
class Bat(Animal, PetMixIn):
    def __init__(self, life, size):
        super().__init__(life)
        self.size = size
    #bat attribution ...
bat = Bat(40, '1')
bat.eat()
print(bat.xxx)