appengine_xblock_runtime 能在 XBlock 环境运行的开发包，尤其适用于在访问 Google App Engine 数据库时。在 Google App Engine 应用程序的时候需注意以下几点： Create a lib/ folder in your application. Download the XBlock repo from GitHub into your lib/ folder. In the lib/XBlock folder, execute: python setup.py egg_info Download this runtime pack