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FastAPI

Dependency injection

Declaring what a route needs and letting the framework provide it, with caching and teardown handled.

The testing payoff is the strongest argument: dependency_overrides swaps a real database for a fake without touching application code.

Declaring a dependency as Annotated[Session, Depends(get_db)] rather than as a default value.

A function providing test dependencies, requested by naming it as a test parameter.

This term is part of the free Python Full-Stack interview preparation module - browse the full glossary for every definition.

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