Knowledge Base: How to apply `black` formatting

[jeremyfowers]

We require that all python files in this repo adhere to black formatting. This is enforced with a black check in some CI workflows.

Here's an example of code that is not properly formatted (left) vs. formatted (right):

The easiest way to get past this is to enable black formatter in your vscode to format-on-save.

To enable black in your own editor:

1. Install the extension
   
2. Set black as the default formatter
   
3. Make sure format-on-save is enabled