sympy/sympy — pull request #1184 by goodok (2012-03-28 20:01:06+00:00)
Title: mathml: standardize the output of mathml printer  for new and old releases of python.

Short description:

`toprettyxml` adds extra white space when printing the contents of text nodes.

For the new releases of python it was fixed, but this leads to the doctest failure
(sympy.printing.mathml.py)

Details:

Date: 2011-11-18
Description: http://ronrothman.com/public/leftbraned/xml-dom-minidom-\
toprettyxml-and-silly-whitespace/#best-solution
Issue: http://bugs.python.org/issue4147
Patch: http://hg.python.org/cpython/rev/7262f8f276ff/

So this commie applying the patch for "xml.dom.minidom" bug.