sympy/sympy — pull request #2273 by mattpap (2013-07-11 15:24:49+00:00)
Title: Remove Python 2.5 stuff (#3930)

This removes all compatibility stuff with Python 2.5. Minimum Python version is now 2.6. Also, use `@public` as a class decorator in `sympy.polys` (previously was used only as function decorator).