Notes: 
On Macintosh, installing Python 3.6.x from python.org installs in /Library/Frameworks/Python.framework.
On Macintosh, you must have only a single version of Python installed in /Library/Frameworks/Python.framework/Versions/. If there is anything other than a single directory in the Versions folder, the Python script will not run.

Help created on 10/11/2018