sympy/sympy — pull request #1443 by smichr (2012-07-28 10:50:11+00:00)
Title: edit expand docstring: don't mix quotes in docstrings

Mixing single and double quotes causes doc-building problems, I think, so I corrected that and made some tiny edits.

Also, there is a suggestion in issue 1844, http://code.google.com/p/sympy/issues/detail?id=1844#c22, that might be considered and could be added to this PR.