[zneveu]

I make a "scratch pad" section of my notebook and work on ideas there. Then once I've pieced together a function line by line and tested it a bit I move it up to where it should be in the chronological order of the notebook. Kind of like your two notebook system but makes copying easier in Jupyter.

[EForEndeavour]

I do the same, though it feels dangerous because both the good-copy and scratch sections share the same kernel. JupyterLab works on .ipynb files, and makes it way easier to copy (or drag and drop) cells between different notebooks. One of these days, I plan to switch to JupyterLab to get a sense of what else it offers above Jupyter Notebook.