def exec(self, args):
        """todo: Docstring for exec

        :param args: arg description
        :type args: type description
        :return:
        :rtype:
        """

        logger.debug("query %s", args.query)

        pl = Repo.installed_list()
        if not pl:
            print("No packages installed, use 'upkg install'")

        idx = 1
        for p in pl:
            print("[%s] %s" % (idx, p))
            idx += 1