Brilliant. Every language should have a book like this. I'm already learning a lot of little details about features I've had some passing experience on. Only request I have (which I generally have for stuff like this), is for real life use cases. Example would be args and *kwargs being used in decorators. Where do you use it? What's a real life example of it being used? How does that compare to the in built decorator…
I use decorators like that in Django where I want to reuse the same code to check something on the request object but the functions I am decorating expect keyword arguments
I've been thinking of something like this for models especially. Where I have made my own models and worked with Flask, but now need to integrate the Django framework. Just a vague idea though. Haven't formed a clear picture of how I'll do it at all