redis & macOS & python
how to install python 3 on mac os x?
https://docs.python.org/3/using/mac.html
# python 3
https://docs.python-guide.org/starting/install3/osx/
https://github.com/realpython/python-guide/
http://osxdaily.com/2018/06/13/how-install-update-python-3x-mac/