Jupyter notebooks are great for many purposes. They have, however, two really tragic shortcomings: 1. They are stored by default in stupid json files instead

Jupyter notebooks are great for many purposes. They have, however, two really tragic shortcomings: 1. They are stored by default in stupid json files instead of plain source code with comments. 2. The text editing interface inside the browser is horrific and very difficult to normalize (e.g., disable "smart" closing of parentheses, disable the capture of classic unix copy-pasting, etc).