https://sumit-ghosh.com/articles/demystifying-decorators-python/

Decorators are one of the most powerful tools Python has, but it may seem elusive to beginners. My first introduction to decorators was through Flask, the web framework. I didn’t really delve into it at that time, just accepted it as a part of the Flask framework that I was to use mindlessly. Maybe it was that way for you too, but you’re here—that means you want to change that. So let’s do it!