Or even better: as plain python files, whose comment paragraphs are interpreted as markdown cells. Thus you have just one file notebook.py that you can run dir

Or even better: as plain python files, whose comment paragraphs are interpreted as markdown cells. Thus you have just one file notebook.py that you can run directly with the python interpreter, open it with a text editor, or open it with the browser and edit/run it like a notebook. Jupytext is fantastic! Why this is not core functionality of jupyter is beyond me.