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Wiring Everything Together
Combine your first controller and service into one tidy application.
At this point, the application already has the basic Autumn rhythm: an entry point, a controller boundary, and a service layer.
A Small Final Snapshot
app/
controllers/
hello.py
services/
greeting.py
app.py
Final Result
The application now looks predictable: controllers receive requests, services execute logic, and the structure stays readable even as the project grows.
This is a simple but stable foundation. You can layer new capabilities on top of it gradually without losing control over the code or its structure.
From here, things grow naturally: routes become more complex, dependencies appear, configuration expands, and infrastructure joins in. But the principle stays the same: clear boundaries, separated responsibilities, and minimal magic.