单例对象 顾名思义，只能创建一个实例对象 class Singleton(object): __instance = None def __new__(cls, XX, YY): if not cls.__instance: cls.__instance = object.__new__(cls) return cls.__instance 1234567 class Singleton(object): __instance = None def __new__(cls, XX, YY): if not cls.__instance: cls.__instance = object.__new__(cls) return cls.__instance