User blog comment:RansomTime/An introduction to Pywikipediabot/@comment-265082-20120722182721/@comment-265082-20120722183843

Actually back in March I was using 2.7.2 and the upload scripts would fail, even contact wikia and finally figured out they only worked with 2.6.5.

If you have 2.7.3 installed do a test to see if upload.py works.