<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def register_actionhandler(self, action_handler: type) -> None: """ register class as action handler """

        for k in action_handler.__dict__:
            if k.startswith('_'):
                continue
            app = action_handler_adapter(action_handler, k)
            self.register_app(k, app)