The first time I read about protocols was in the book "Fluent Python" by Luciano Ramalho. This book goes deep. Deeper than I knew Python at that time. If you hadn't heard of Protocols before, I'll give you a short introduction. Protocols have something to do with typing. With protocols,

Protocols have something to do with typing. With protocols, you can check whether an object is valid based on whether it has the right methods and attributes. The idea is to check for behaviour instead of inheritance. Protocols extend Python’s type hints by allowing to define structural types.