python 单例模式
class Singleton(type): def init(self, *args, *kwargs): self.__instance = None super().init(args, **kwargs)
def __call__(self, *args, **kwargs):
if self.__instance is None:
self.__instance = super().__call__(*args, **kwargs)
return self.__instance
else:
return self.__instanceExample
class Spam(metaclass=Singleton): def init(self): print('Creating Spam')
举报
腾讯云开发者
