Over the weekend I put together an a new build tool written in Python and based on Ant. This new tool is called Pyb. Documentation and download is available at http://pyb.sf.net .
Pyb, although written in Python, already has tasks for building Java projects (such as javac, java, javadoc, jar and war) in addition to tasks specific to Python (setup, epydocs, and python execution). There are also some common tasks for zip, gzip, tar, bz2, copy and delete). Build scripts are written in Python rather than XML or some other format. This gives you access to the full power of Python if necessary.
Questions and comments can be directed to the the pyb developer mailing list which can be found on the Pyb SourceForge site at http://www.sf.net/projects/pyb .
Sincerely, Anthony Eden