While our focus has mostly been on getting away from Python by choosing Node.js and Express over Python and Django, it's definitely workable to integrate them. We used one specific paradigm here: a React app sitting as a static built app inside a Django app. The Django application is routing HTTP requests either to the API bot app if it has /api in the URL, or to the React react-frontend app for everything else.
Incorporating Django with React isn't really the easiest thing in the world, and this is only one possible paradigm of how to couple this, in what I'd term tightly-coupled scaffolding. If we were to have our React and Django apps completely separate and only interacting via XHR calls with Ajax, that would arguably be a more true-to-life scenario. However, that would involve having separate setups for the two halves, and today what we constructed was a single server for our whole application.
In the next chapter, we'll be working with Express and React...