I haven't really followed Jupyter's development lately, so maybe this is already happening, but I think what you really need is some concept of a workspace, rat

I haven't really followed Jupyter's development lately, so maybe this is already happening, but I think what you really need is some concept of a workspace, rather than a single file. The problem with notebooks is that they get unwieldy, and you want to keep a bunch of code around that's only useful in certain cases, or just starts doing "too much". Sure, you can factor this code out into a library/function, but there's nothing that makes that easy, and once you've made it into a library, there's nothing that helps you easily make changes to that library in a different notebook.