{* ../../docs_src/path_params/tutorial002_py310.py hl[7] *}

In this case, `item_id` is declared to be an `int`.

/// check

This will give you editor support inside of your function, with error checks, completion, etc.

///

## Data <dfn title="also known as: serialization, parsing, marshalling">conversion</dfn> { #data-conversion }

* `headers` - Eklenecek özel header’lar; dictionary olarak.
* `media_type` - Media type’ı veren string. Ayarlanmazsa, dosya adı veya path kullanılarak media type tahmin edilir.
* `filename` - Ayarlanırsa response içindeki `Content-Disposition`’a dahil edilir.

File response'ları uygun `Content-Length`, `Last-Modified` ve `ETag` header’larını içerir.

{* ../../docs_src/custom_response/tutorial009_py310.py hl[2,10] *}

Die gleichen Prozesse, die für Pfad-Parameter gelten, werden auch auf Query-Parameter angewendet:

* Editor Unterstützung (natürlich)
* Daten-<dfn title="Konvertieren des Strings, der von einem HTTP-Request kommt, in Python-Daten">„Parsen“</dfn>
* Datenvalidierung
* Automatische Dokumentation

## Defaultwerte { #defaults }

/// note | Nota

FastAPI sabrá que el valor de `q` no es requerido por el valor por defecto `= None`.

Tener `str | None` permitirá que tu editor te dé un mejor soporte y detecte errores.

///

## Validaciones adicionales { #additional-validation }

Vamos a hacer que, aunque `q` sea opcional, siempre que se proporcione, su longitud no exceda los 50 caracteres.

# EditorConfig helps developers define and maintain consistent
# coding styles between different editors and IDEs
# editorconfig.org

root = true

[*]

indent_style = space
indent_size = 4

end_of_line = lf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true

spelling_languages = en-US

# Markdown files sometimes need trailing whitespaces.
[*.md]
trim_trailing_whitespace = false

...de:

```Python
        ... "item_name": item.name ...
```

...para:

```Python
        ... "item_price": item.price ...
```

...e veja como seu editor irá auto-completar os atributos e saberá os tipos:

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

# Treat all files in the Go repo as binary, with no git magic updating
# line endings. This produces predictable results in different environments.
#
# Windows users contributing to Go will need to use a modern version
# of git and editors capable of LF line endings.
#
# Windows .bat files are known to have multiple bugs when run with LF
# endings, and so they are checked in with CRLF endings, with a test

{* ../../docs_src/authentication_error_status_code/tutorial001_an_py310.py hl[9:13] *}

/// tip | İpucu

Fonksiyonun exception instance'ını döndürdüğüne dikkat edin; exception'ı raise etmiyor. Raise işlemi internal kodun geri kalan kısmında yapılıyor.

```console
$ fastapi dev main.py
```

Ancak `fastapi` komutunu her çağırdığınızda doğru path'i geçmeyi hatırlamanız gerekir.

Ayrıca, [VS Code Extension](editor-support.md) veya [FastAPI Cloud](https://fastapicloud.com) gibi diğer araçlar da bunu bulamayabilir; bu yüzden `pyproject.toml` içindeki `entrypoint`'i kullanmanız önerilir.

## `fastapi dev` { #fastapi-dev }

     *
     * @return the RID
     */
    int getRid();

    /**
     * Return a String representing this SID ideal for display to
     * users. This method should return the same text that the ACL
     * editor in Windows would display.
     * <p>
     * Specifically, if the SID has
     * been resolved and it is not a domain SID or builtin account,
     * the full DOMAIN\name form of the account will be