Link: http://broadcast.oreilly.com/2008/11/spring-python-and-amara.html

For now, we are using Amara 1.2 because we need stable support. We definitely hope to migrate to 2.x someday, and we will have to deal with that python2.5+ requirement. This may require two versions of Spring Python. Supporting Python 2.4, 2.5, 2.6, 3+ all have impact on what we will support. There is always the pressure to upgrade, update, and get to the latest. But community support for older versions, especially big enterprises, has always been a strong point of Spring, so we won’t jump as quickly as some may want us to. Community needs will play a key role in this decision, and how many versions we support.