This is how to use the Black Python code formatter in VS Code.
Make a Python 3.6 virtualenv for running Black
Black itself requires Python 3.6 to run, but few of our projects are on that version. The VS Code plugin conveniently lets you run black from its own virtualenv.
I had to give a specific version of black this morning. I didn't yesterday. Don't specify the version unless it makes you (and if you do, give the current version, not the one from this doc).
$ cd ~/Envs