Architecture in Python

Layers, ports and adapters, repositories, services and events: structure an application so each part can be tested alone.

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1. 1Layers and import direction
2. 2Functional core, imperative shell
3. 3Dependency inversion
4. 4Entities and value objects
5. 5A state machine for a workflow
6. 6The repository pattern
7. 7A service layer
8. 8Unit of work
9. 9Domain events and handlers
10. 10Commands and queries
11. 11Ports and adapters
12. 12Errors at layer boundaries
13. 13Caching behind an interface
14. 14Plugin registries
15. 15Configuration and wiring