[periheli0n]

The whole point of notebooks is to focus only on exploration of data, making some nice plots, adding some explanatory text, and NEVER think about software engineering.

A decent data scientist who also understands software engineering will sooner or later take the prototype code from the notebook and refactor it into proper modules. Either this or the notebook will become an unrunnable mess as it is developed further. Reusing code and functions in a grown notebook is just too fragile.