sagemath/sagenb — pull request #41 by kini (2012-02-24 14:43:44+00:00)
Title: Reimplement patch from trac #10998

Basically [this](http://trac.sagemath.org/sage_trac/attachment/ticket/10998/trac_10998-categories-posets-sagenb-nt.patch), except obeying PEP-8