A lot of this came from a talk idea that Europython in Berlin in 2014 called full stack Python where I pretty much had a picture like this. The feedback from people was like, that talk would have been really hard to follow if not for the visuals. So I thought, okay, obviously these visuals are powerful and they should I should continue on with that. You can pretty much follow the steps in each chapter and you start out with the server. And if you don't have an application, like here is a full tutorial. It's the appendix C in the book where I walk through an entire open source application.