sympy/sympy — pull request #730 by Habel (2011-11-22 00:42:20+00:00)
Title: Fixed up some errors that were reported by pyflakes

This is a submission for the google code-in. The task url is http://www.google-melange.com/gci/task/view/google/gci2011/7116301.

To expand on what I changed:

I used pyflakes to make sure that a few modules in the code had no errors. The modules I worked on were core, assumptions, concrete, combinatorics, integrals, logic,
matrices, series and printing, and functions. I also just made sure all tests were up to date by deleting any unused imports in core.