sympy/sympy — pull request #7935 by cbm755 (2014-08-29 09:39:21+00:00)
Title: Printing: print x**-1.0 differently from 1/x

`x**-1.0` and `x**-1` should print differently. Fixed this and added
tests. Pretty printing seemed to work already but tests added.
Issue 2860 is related and seems fixed; added tests.