??? 123123123123 .....................................................................................................................................??? 123123123123 .....................................................................................................................................3 À<×eOã@sGdd„deƒZdS)c@s(eZdZdZdZdd„Zedd„ƒZdS)Ú Singletonz Singleton design pattern. NcCs|jtkrtdƒ‚dS)NzCannot instantiate directly.)Ú __class__rÚ TypeError)Úself©rú/usr/lib/python3.6/patterns.pyÚ__init__s zSingleton.__init__cCs|jdkr|ƒ|_|jS)zGet the class instance.N)Ú _instance)ÚclsrrrÚ get_instance s zSingleton.get_instance)Ú__name__Ú __module__Ú __qualname__Ú__doc__rrÚ classmethodr rrrrrsrN)ÚobjectrrrrrÚs