sympy/sympy — pull request #2645 by rathmann (2013-12-02 18:00:15+00:00)
Title: A simpler, more limited fix to issue 4111.

Just change a few stray invocations of iteritems() to items(), in
order to be compatible with Python3 and consistent with previous
changes for supporting a Python2/3 unified source.

modified: sympy/core/compatibility.py
modified: sympy/core/tests/test_compatibility.py
modified: sympy/functions/elementary/trigonometric.py
modified: sympy/polys/polycontext.py