结构 . ├── app ├── constants.py ├── error.py # custom errors ├── main.py ├── router # routes aka controller in mvc pattern └── service.py # logics aka model in mvc pattern ├── test ├── data # sample data to run the unit tests └── test_service.py # unit tests for the service.py module ├── .env # environment variables ├── Dockerfile ├── pyproject.toml ├── README.md