Return a Route object for route `rt` using API instance `api`.

def get(_class, api, rt):
        """
        Return a Route object for route `rt` using API instance `api`.
        """
             
        if not _class.all_routes:
            _class.all_routes = _class.update_list(api, api.routes()['route'])

        return _class.all_routes[str(rt)]