*,
        grant_type: Annotated[
            Union[str, None],
            Form(pattern="password"),
            Doc(
                """
                The OAuth2 spec says it is required and MUST be the fixed string
                "password". Nevertheless, this dependency class is permissive and
                allows not passing it. If you want to enforce it, use instead the
                `OAuth2PasswordRequestFormStrict` dependency.

Several of these are explored in the next chapters of the tutorial.

## Order matters

When creating *path operations*, you can find situations where you have a fixed path.

Like `/users/me`, let's say that it's to get data about the current user.

And then you can also have a path `/users/{user_id}` to get data about a specific user by some user ID.

そのため、OpenAPIでは同じ目的のために<a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.3.md#fixed-fields-20" class="external-link" target="_blank">`example`</a>を独自に定義しており（`examples`ではなく`example`として）、それがdocs UI（Swagger UIを使用）で使用されています。

つまり、`example`はJSON Schemaの一部ではありませんが、OpenAPIの一部であり、それがdocs UIで使用されることになります。

## その他の情報

    ```Python hl_lines="16"
    {!> ../../../docs_src/dependencies/tutorial011.py!}
    ```

Und auf diese Weise können wir unsere Abhängigkeit „parametrisieren“, die jetzt `"bar"` enthält, als das Attribut `checker.fixed_content`.

## Die Instanz als Abhängigkeit verwenden

OpenAPI 3.0.3 основан на более старой версии JSON-схемы, которая не имела поля `examples`.

Таким образом, OpenAPI 3.0.3 определяет своё собственное поле <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.3.md#fixed-fields-20" class="external-link" target="_blank">`example`</a> для модифицированной версии **JSON Schema**, которую он использует чтобы достичь той же цели (однако это именно поле `example`, а не `examples`), и именно это используется API в UI документации...

ples`</a>, mas o OpenAPI 3.0.3 é baseado numa versão mais antiga do JSON Schema que não tinha `examples`.

Por isso, o OpenAPI 3.0.3 definiu o seu próprio <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.3.md#fixed-fields-20" class="external-link" target="_blank">`example`</a> para a versão modificada do **JSON Schema** que é usada, para o mesmo próposito (mas é apenas `example` no singular, não `examples`), e é isso que é usado pela UI da documentação da API(usando...

En héritant de `str` la documentation sera capable de savoir que les valeurs doivent être de type `string` et pourra donc afficher cette `Enum` correctement.

Créez ensuite des attributs de classe avec des valeurs fixes, qui seront les valeurs autorisées pour cette énumération.

```Python hl_lines="1  6-9"
{!../../../docs_src/path_params/tutorial005.py!}
```

!!! info

所以 OpenAPI为了相似的目的定义了自己的 <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.3.md#fixed-fields-20" class="external-link" target="_blank">`example`</a> (使用 `example`, 而不是 `examples`), 这也是文档 UI 所使用的 (使用 Swagger UI).

所以，虽然 `example` 不是JSON Schema的一部分，但它是OpenAPI的一部分，这将被文档UI使用。

## 其他信息

* The `password`.
* An optional `scope` field as a big string, composed of strings separated by spaces.
* An optional `grant_type`.

!!! tip
    The OAuth2 spec actually *requires* a field `grant_type` with a fixed value of `password`, but `OAuth2PasswordRequestForm` doesn't enforce it.

    If you need to enforce it, use `OAuth2PasswordRequestFormStrict` instead of `OAuth2PasswordRequestForm`.

, 🗄 3️⃣.0️⃣.3️⃣ 🔬 🚮 👍 <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.3.md#fixed-fields-20" class="external-link" target="_blank">`example`</a> 🔀 ⏬ **🎻 🔗** ⚫️ ⚙️, 🎏 🎯 (✋️ ⚫️ 👁 `example`, 🚫 `examples`), &amp; 👈 ⚫️❔ ⚙️ 🛠️ 🩺 🎚 (⚙️ 🦁 🎚).