John,

Thanks for testing the test case in python2. I didn't think of it. To
help me write the test case I came up with this matrix for the names in
the expression:

Name   	       Python3 w/o fix 	 Python2   Fix
context		     Y 	      	    Y  	    Y
x                                           Y
user_realnames	      		    Y 	    Y
assignedto	     Y		    Y
realname	     		    Y

If you look at the expression you will realize that only context and
user_realnames are external variables, and so are required. It doesn't
matter if x is there or not since it is local and initialized, and
assignedto and realname are members of context and x, respectively.

I updated and ran the test case with these results:

~/src/tracker-new/roundup-code$ python2 run_tests.py test/test_pythonexpr.py
====================================== test session starts
=======================================
platform linux2 -- Python 2.7.12, pytest-2.9.2, py-1.4.31, pluggy-0.3.1
rootdir: /home/tekberg/src/tracker-new/roundup-code, inifile:
collected 1 items

test/test_pythonexpr.py .

==================================== 1 passed in 0.02 seconds
====================================
~/src/tracker-new/roundup-code$ python run_tests.py test/test_pythonexpr.py
====================================== test session starts
=======================================
platform linux -- Python 3.5.2, pytest-2.9.2, py-1.4.31, pluggy-0.3.1
rootdir: /home/tekberg/src/tracker-new/roundup-code, inifile:
collected 1 items

test/test_pythonexpr.py .

==================================== 1 passed in 0.04 seconds
====================================