How to use the shortuuid.random function in shortuuid

package = await PackageParse.parse(file_path)
        if not package:
            os.remove(file_path)
            raise BadRequest('the file is not support')

        app_query = session.query(AppModel).filter_by(package_name=package.package_name, type=package.app_type)

        if app_query.count():  # 已存在
            exists = True
            app = app_query.one()
        else:  # 不存在
            exists = False
            # 生成短链
            while 1:
                short_chain = random(8)
                if not session.query(AppModel).filter_by(short_chain_uri_=short_chain).count():
                    break

            app_uuid = uuid('+_{}-{}_+'.format(package.app_type, package.package_name), 16)
            icon_name = '{}.{}'.format(app_uuid, package.icon_path[package.icon_path.rfind('.') + 1:])
            app = AppModel(type=package.app_type, short_chain_uri_=short_chain, detail='', name=package.app_name,
                           package_name=package.package_name, icon_='{}/{}'.format(Config.icon_dir, icon_name),
                           icon_uri_='{}/{}'.format(Config.static_icon, icon_name))
            session.add(app)
            session.commit()
            app.version_code = package.version_code
            app.version_name = package.version_name

        # 保存图标
        await package.save_icon(app.icon_)

def generate_pairing_code():
    shortuuid.set_alphabet("0123456789ABCDEF")
    return shortuuid.random(length=6)