@defer.inlineCallbacks
    def on_GET(self, request, user_id, room_id):
        requester = yield self.auth.get_user_by_req(request)
        if user_id not in requester.user.to_string():
            raise AuthError(403, "Cannot get tags for other users.")

        tags = yield self.store.get_tags_for_room(user_id, room_id)

        defer.returnValue((200, {"tags": tags}))
dataset/ETHPy150Open matrix-org/synapse/synapse/rest/client/v2_alpha/tags.py/TagListServlet.on_GET/operator `!=` -> `not in`