JFIFxxC      C  " }!1AQa"q2#BR$3br %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz w!1AQaq"2B #3RbrJFIFxxC      C  " }!1AQa"q2#BR$3br %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz w!1AQaq"2B #3Rbrclass Singleton(object): """ Singleton design pattern. """ _instance = None def __init__(self): if self.__class__ is Singleton: raise TypeError("Cannot instantiate directly.") @classmethod def get_instance(cls): """Get the class instance.""" if cls._instance is None: cls._instance = cls() return cls._instance