forth: fixes for Flake8 compliance in Python 2.7
forth: fixes for Flake8 compliance in Python 2.7

behrtam/xpython,jmluy/xpython,exercism/python,jmluy/xpython,pheanex/xpython,smalley/python,exercism/xpython,N-Parsons/exercism-python,mweb/python,behrtam/xpython,mweb/python,smalley/python,exercism/xpython,pheanex/xpython,N-Parsons/exercism-python,exercism/python