python - 如何使用mixin类为python中的多个类提供方法

Question

我试图了解如何在 python 中使用 mixin。我想让 Bird、Dog 和 Bat 类拥有 PetMixIn 类中的 eat 方法，但也可以是自实例。我该怎么做？

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

这里是一个小例子(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)