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What version of Spambayes are you using?

Is there a Spambayes test suite I can run with a given
Python, without screwing with my own Spambayes installation?
 I don't know anything about Spambayes development.

Is this running on Mac OS X of some flavor?  (Guessing from
the weird /Users directory.)

mwh's comment is right on target; something fishy is going
on here.  It looks like you're getting the CVS version of
weakref.py, but you _weakref.so is out of date.