from abc import ABCMeta, abstractmethod
# 鴨子類
class Dock(metaclass=ABCMeta):
    @abstractmethod
    def Swimming(self):  # 游泳方法協(xié)議（接口）
        pass
    @abstractmethod  # 走路協(xié)議（接口）
    def Walk(self):
        pass
    @classmethod
    def __subclasshook__(cls, C):
        # 判斷是否另一個(gè)比較類是否實(shí)現(xiàn)了 Swimming Walk 協(xié)議， 如果實(shí)現(xiàn)了鴨子類的這兩個(gè)協(xié)議，
        # 那么比較類的類型就是一個(gè)鴨子類型
        # 當(dāng)代碼執(zhí)行中如果執(zhí)行到對(duì)象和這個(gè)類進(jìn)行 isinstance 類型判斷時(shí)會(huì)走到這個(gè)函數(shù)進(jìn)行判斷
        for method in ('Swimming', 'Walk'):
            for B in C.__mro__:
                if method in B.__dict__:
                    if B.__dict__[method] is None:
                        return NotImplemented
                    break
            else:
                return NotImplemented
        return True
# 狗類
class Dog(object):
    # 實(shí)現(xiàn)swimming 協(xié)議
    def Swimming(self):
        print("狗會(huì)狗刨")
    # 實(shí)現(xiàn)walk 協(xié)議
    def Walk(self):
        print("狗會(huì)走路")
    def Eat(self):
        print("狗喜歡吃骨頭")
# 烏龜類
class Tortoise(object):
    # 實(shí)現(xiàn)swimming 協(xié)議
    def Swimming(self):
        print("烏龜會(huì)潛水")
    # 實(shí)現(xiàn)walk 協(xié)議
    def Walk(self):
        print("烏龜會(huì)走路")
    def Eat(self):
        print("烏龜喜歡吃魚")

dog = Dog()
tortoise = Tortoise()
print(isinstance(dog, Dock))         # True
print(isinstance(tortoise, Dock))	 # True