I have 2 python versions installed under my mac osx sierra: python 3.5 python 2.7
I installed pyinstaller under python3.5 with this command:
python3
Right now the only way I found to make it works is to: navigate to:
/Library/Frameworks/Python.framework/Versions/3.5/bin
run pyinstaller mypython35script.py
cheers d.
ps I still don't know why is not working in the way I described in my first post.