Sikuli all versions: works with python 3.1 ?? --- No --- Jython 2.5.1 means Python language level 2.5

It is not really Python, that you are using. It is the Python language, that is run through the interpreter Jython 2.5.1 (but Jython 2.5.2 rc3 might be used also).

So it depends on what features of Python language level 3.x are already supported by Jython 2.5.1 / 2,5,2.

Answers can be found on the Jython homepage:
http://www.jython.org/index.html

Seems, that even not yet full compatibility to Python 2.6 is reached now (planned for Jython 2.6)

Thanks a lot Raiman~