Thanks for noticing this Alex.  Perhaps the attached patch would work
better? This allows us to work properly with older python versions as
well.  The hashlib module was added in python-2.5¹.

¹ Or so says http://docs.python.org/library/hashlib.html


Ah yes, that's an excellent point.

Best,
Alex



--
Alex Ghitza -- Lecturer in Mathematics -- The University of Melbourne -- Australia -- http://www.ms.unimelb.edu.au/~aghitza/