Slawomir Jaranowski <******@****.***> 1755121062 +0200

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* ⬆ Bump dawidd6/action-download-artifact from 2.9.0 to 2.21.1. PR [#5130](https://github.com/tiangolo/fastapi/pull/5130) by [@dependabot[bot]](https://github.com/apps/dependabot).
* ⬆ Bump actions/setup-python from 2 to 4. PR [#5129](https://github.com/tiangolo/fastapi/pull/5129) by [@dependabot[bot]](https://github.com/apps/dependabot).

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## Second dependency, "dependable" and "dependant" { #second-dependency-dependable-and-dependant }

Then you can create another dependency function (a "dependable") that at the same time declares a dependency of its own (so it is a "dependant" too):

{* ../../docs_src/dependencies/tutorial005_an_py310.py hl[13] *}

Let's focus on the parameters declared:

Let's see a very simple example. It will be so simple that it is not very useful, for now.

But this way we can focus on how the **Dependency Injection** system works.

### Create a dependency, or "dependable" { #create-a-dependency-or-dependable }

Let's first focus on the dependency.

It is just a function that can take all the same parameters that a *path operation function* can take:

* Release Notes: Release Notes (do not translate to "Notas de la Versión")
* Semantic Versioning: Semantic Versioning (do not translate to "Versionado Semántico")
* dependable: dependable (do not translate to "confiable" or "fiable")
* list (as in Python list): list
* context manager: context manager (do not translate to "gestor de contexto" or "administrador de contexto")
* a little bit: un poquito

## A `dict` from the previous example { #a-dict-from-the-previous-example }

In the previous example, we were returning a `dict` from our dependency ("dependable"):

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[9] *}

But then we get a `dict` in the parameter `commons` of the *path operation function*.

## Впровадження залежностей

Використання `BackgroundTasks` також працює з системою впровадження залежностей. Ви можете оголосити параметр типу `BackgroundTasks` на різних рівнях: у *функції операції шляху*, у залежності (dependable), у під залежності тощо.

**FastAPI**  знає, як діяти в кожному випадку і як повторно використовувати один і той самий об'єкт, щоб усі фонові задачі були об’єднані та виконувалися у фоновому режимі після завершення основного запиту.