sympy/sympy — pull request #1472 by scolobb (2012-08-08 16:16:20+00:00)
Title: [WIP] Fix the DiagramGrid import failure in categories.rst.

This is an attempt to fix https://github.com/sympy/sympy/pull/1429#issuecomment-7570113 .

I can't reproduce it on my computer, so this pull request does not contain the actual solution as of yet.