单例之装饰器

# __author: "ZXYang"
# date: 2020/12/13


def single(cls):
    dic = {}

    def wrapper(*args, **kwargs):
        if dic.get(cls):
            return dic[cls]
        else:
            dic[cls] = cls(*args, **kwargs)
            return dic[cls]

    return wrapper


@single
class Dog(object):
    pass


dog1 = Dog()
dog2 = Dog()
dog3 = Dog()

print(id(dog1), id(dog2), id(dog3))