Django is committed to API stability and forwards-compatibility. In a nutshell, this means that code you develop against a version of Django will continue to work with future releases. You may need to make minor changes when upgrading the version of Django your project uses: see the "Backwards incompatible changes" section of the release note for the version or versions to which you are upgrading.
At the same time as making API stability a very high priority, Django is also committed to continual improvement, along with aiming for "one way to do it" (eventually) in the APIs we provide. This means that when we discover clearly superior ways to do things, we will deprecate and eventually remove the old ways. Our aim is to provide a modern, dependable web framework of the highest quality that encourages best practices in all projects that use it. By using incremental improvements, we try to avoid both stagnation and large breaking upgrades.
所有发布的 API （在文档中的一切 API ）在不提供向后兼容的别名的情况下，都不会被移除或者重命名。
如果文档中的 API 添加了新特性（这是极有可能的），新特性不会导致现有方法罢工或者修改方法的含义。也就是说，“稳定性”并不意味着“不变性”。
假如因为某些原因，一个“稳定的” API 必须被移除或者被代替，它将会被弃用但仍然会被保留直到至少有两个新特性发布。当调用即将被弃用的方法时，会产生警告。
有关 Django 是如何编写版本号以及一些功能是如何被弃用的详细信息，请看： Official releases。
We'll only break backwards compatibility of these APIs without a deprecation process if a bug or security hole makes it completely unavoidable.