Not all of my colleagues know how to code, but they do know how to interpret results, plots and so on (I'm in science, by the way). In my case, I am not interested in version controlling the notebook; it's just for quick prototyping and discussing ideas. I only need to version control the Python file. Also, colleagues who don't code (or dislike coding) can easily modify parameters in the notebook and obtain different results immediately with no additional effort.