Many of you will be aware that Python 2.6 was released a month ago (October 1st, 2008). This supports a lot of new syntax and functionality, but also deprecates some old modules (e.g. the sets module). While Biopython 1.48 does mostly work with Python 2.6, we’ve been testing with Python 2.6 and have fixed a number of deprecations or breakages in our CVS repository.