sympy/sympy — pull request #2434 by larsmans (2013-09-03 22:09:03+00:00)
Title: missing __init__.py and __future__ imports

I got some warnings from `pip install sympy`. This fixes 3 out of 4; I'm not sure what to do with

File "/usr/local/lib/python2.7/dist-packages/sympy/mpmath/libmp/exec_py3.py", line 1
exec_ = exec
^
SyntaxError: invalid syntax

but I guess it's harmless.