Interesting, I haven't tried Volatility with
Python 2.6 yet. Looking
 at the module in question, I don't actually see anywhere that sha is
 used. I'll make a note to look whether we can just remove that. 
One of my students noticed this as well. I had asked her to send me
the error message, but I guess she forgot...  After she commented out
that line it worked fine.
All the best,
-Jamie