Question

在本章我们将讨论一下话题：

• 阅读 Django 代码
• 探索相关文档
• 增量变更还是完全重写
• 改变代码之前编写测试
• 旧版本数据库的集成

It sounds exciting when you are asked to join a project. Powerful new tools and cutting-edge technologies might await you. However, quite often, you are asked to work with an existing, possibly ancient, codebase.

加入项目时你可能很感兴趣。

To be fair, Django has not been around for that long. However, projects written for older versions of Django are sufficiently different to cause concern.