[MrSaints]

Awesome. I've always been curious over examples of clean architecture in Python. I had a cursory glance. As a suggestion, I think the `Room` domain model could be improved with dataclasses (https://docs.python.org/3/library/dataclasses.html).

[thedigicat]

Ah, you already know what you will find in the next releases of the book =) Thank for the suggestion, actually I was struck by dataclasses as they are exactly what I needed for a project I have, a sort of library for clean architectures. We'll see. Thanks!

[BerislavLopac]

Or even more by attrs: https://www.attrs.org/en/stable/

[_fbpt]

Try @attr.dataclass. It uses the cleaner 3.6+ dataclass syntax, but is more flexible (supports kw-only classes).

[thedigicat]

Thank you both for your suggestions, I will consider using one of these in the next versions of the book. Python is a moving target, so I will have to update the examples.

[MrSaints]

I've recently also come across https://pydantic-docs.helpmanual.io/ which appears to be useful for enforcing simple constraints on domain entities.