def signal_handler(self, *args):
        """
        Method to call in order to invoke the user callback.

        :param args: list of signal-dependent arguments
        :return:
        """
        self.user_callback(self.signal, self.user_arg, *args)
def signal_handler ( self , * args ) : self . user_callback ( self . signal , self . user_arg , * args )
Method to call in order to invoke the user callback.

        :param args: list of signal-dependent arguments
        :return: