#Jupyter+#Jupytext. I just discovered Jupytext and it's completely changed my life. Suddenly my project which was to be code, documentation, and discourse trying to explain what it was all about has become just notebook chapters that are meant to be read, run, and imported as libraries. That's just terrific. Now my sub-modules are chapters, and my whole project without me realizing it has turned into a "book" in progress - which is actually the best way to present it all.