Architecture Patterns

This one walks you through Clean Architecture, Hexagonal Architecture, and DDD with actual code examples in Python. You get the full layer breakdowns (entities, use cases, adapters), directory structures, and working implementations showing how to separate your domain logic from framework dependencies. The examples are practical: user repositories, order services, value objects, and how to wire up ports and adapters so you can swap databases or mock things for testing. It's comprehensive enough to use as a reference when refactoring a monolith or setting up architecture standards for a team. The code samples are clear and show the dependency flow you actually need to maintain to make these patterns work.