sympy/sympy — pull request #1881 by smichr (2013-03-10 23:41:15+00:00)
Title: 3068_3052: partial resolution of sign/Abs issues

sign will return a number (and abs a non-Abs expression) more often.

There are still evalf problems, but this is some improvement over the current situation.

https://code.google.com/p/sympy/issues/detail?id=3068
https://code.google.com/p/sympy/issues/detail?id=3052