Modifications for Python 3.
Running futurize and modifying _coerce() function in myopt.py. The latter was required for incompatible way the exec() statement/function behaves in Python 2 vs. Python 3.
Running futurize and modifying _coerce() function in myopt.py. The latter was required for incompatible way the exec() statement/function behaves in Python 2 vs. Python 3.