* Give you the received data in the parameter `item`.
    * As you declared it in the function to be of type `Item`, you will also have all the editor support (completion, etc) for all of the attributes and their types.

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

* in <a href="https://www.jetbrains.com/pycharm/" class="external-link" target="_blank">PyCharm</a>:

![editor support](https://fastapi.tiangolo.com/img/pycharm-completion.png)

 * managing build environments.</p>
 *
 * <p>Key features include:</p>
 * <ul>
 *   <li>Interactive command-line interface</li>
 *   <li>Command history and completion</li>
 *   <li>Built-in shell commands</li>
 *   <li>Project navigation and management</li>
 * </ul>
 *
 * @see org.apache.maven.api.cli.Tools#MVNSHELL_CMD
 * @see org.apache.maven.api.cli.Tools#MVNSHELL_NAME

If you install Typer CLI, you can install completion with:

<div class="termy">

```console
$ typer --install-completion

zsh completion installed in /home/user/.bashrc.
Completion will take effect once you restart the terminal.
```

</div>

### Docs Structure

![soporte del editor](https://fastapi.tiangolo.com/img/vscode-completion.png)

* en <a href="https://www.jetbrains.com/pycharm/" class="external-link" target="_blank">PyCharm</a>:

![soporte del editor](https://fastapi.tiangolo.com/img/pycharm-completion.png)

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

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

And we know that editors can't provide a lot of support (like completion) for `dict`s, because they can't know their keys and value types.

We can do better...

## What makes a dependency { #what-makes-a-dependency }

Up to now you have seen dependencies declared as functions.

    "image": {
        "url": "http://example.com/baz.jpg",
        "name": "The Foo live"
    }
}
```

Again, doing just that declaration, with **FastAPI** you get:

* Editor support (completion, etc.), even for nested models
* Data conversion
* Data validation
* Automatic documentation

## Special types and validation { #special-types-and-validation }

* **Moins de bugs** : Réduit d'environ 40 % les erreurs induites par le développeur. *
* **Intuitif** : Excellente compatibilité avec les IDE. <abbr title="également connu sous le nom d'auto-complétion, autocomplétion, IntelliSense">Complétion</abbr> complète. Moins de temps passé à déboguer.
* **Facile** : Conçu pour être facile à utiliser et à apprendre. Moins de temps passé à lire la documentation.

* **Ít lỗi hơn**: Giảm khoảng 40% những lỗi phát sinh bởi con người (nhà phát triển). *
* **Trực giác tốt hơn**: Được các trình soạn thảo hỗ tuyệt vời. <abbr title="như auto-complete, autocompletion, IntelliSense">Completion</abbr> mọi nơi. Ít thời gian gỡ lỗi.
* **Dễ dàng**: Được thiết kế để dễ dàng học và sử dụng. Ít thời gian đọc tài liệu.
* **Ngắn**: Tối thiểu code bị trùng lặp. Nhiều tính năng được tích hợp khi định nghĩa tham số. Ít lỗi hơn.

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

* у <a href="https://www.jetbrains.com/pycharm/" class="external-link" target="_blank">PyCharm</a>:

![editor support](https://fastapi.tiangolo.com/img/pycharm-completion.png)

### Короткий код