app = FastAPI()


class Item(BaseModel):
    name: str
    price: float
    is_offer: Union[bool, None] = None


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}


@app.put("/items/{item_id}")
def update_item(item_id: int, item: Item):

OpenAPIスキーマを完全に無効にする場合は、`openapi_url=None` を設定できます。これにより、それを使用するドキュメントUIも無効になります。

## ドキュメントのURL

以下の2つのドキュメントUIを構築できます:

* **Swagger UI**: `/docs` で提供されます。
     * URL はパラメータ `docs_url` で設定できます。
     * `docs_url=None` を設定することで無効にできます。
* ReDoc: `/redoc` で提供されます。
     * URL はパラメータ `redoc_url` で設定できます。
     * `redoc_url=None` を設定することで無効にできます。

* `limit=10`: çünkü varsayılan değer buydu.

## İsteğe Bağlı Parametreler

Aynı şekilde, varsayılan değerlerini `None` olarak atayarak isteğe bağlı parametreler tanımlayabilirsiniz:

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

Bu durumda, `q` fonksiyon parametresi isteğe bağlı olacak ve varsayılan değer olarak `None` alacaktır.

/// check | Ek bilgi

    public void setPriority(final String priority) {
        this.priority = priority;
    }

    /**
     * Gets the list of images associated with this URL.
     * @return the list of images, or an empty list if none
     */
    public List<SitemapImage> getImages() {
        if (images == null) {
            images = new ArrayList<>();
        }
        return images;
    }

    /**

     * Gets the installation Toolchains source.
     *
     * @return the installation Toolchains source or {@code null} if none
     */
    @Nonnull
    Optional<Source> getInstallationToolchainsSource();

    /**
     * Gets the user Toolchains source.
     *
     * @return the user Toolchains source or {@code null} if none
     */
    @Nonnull
    Optional<Source> getUserToolchainsSource();

    @Nonnull

    /**
     * Locates the pom in the given directory.
     *
     * @param dir the directory to locate the pom for, never {@code null}
     * @return a {@code Source} pointing to the located pom or an empty {@code Optional} if none was found by this parser
     */
    @Nonnull
    Optional<Source> locate(@Nonnull Path dir);

    /**
     * Parse the model obtained previously by a previous call to {@link #locate(Path)}.
     *

 * </ul>
 *
 */
@CacheableTask
abstract class UserGuideTransformTask extends DefaultTask {

    @PathSensitive(PathSensitivity.NONE)
    @InputFile
    abstract RegularFileProperty getSourceFile();

    @PathSensitive(PathSensitivity.NONE)
    @InputFile
    abstract RegularFileProperty getLinksFile();

    @OutputFile
    abstract RegularFileProperty getDestFile();

    @Input

     * @param url the URL that requires authentication
     * @param sae the authentication exception that was thrown
     * @return credentials returned by prompt or null if none available
     */

    public static NtlmPasswordAuthentication requestNtlmPasswordAuthentication(final String url, final SmbAuthException sae) {
        if (auth == null) {
            return null;
        }

     * identifier for the super POM.
     *
     * @param modelId The identifier of the model whose active profiles should be retrieved, must not be {@code null}.
     * @return The active profiles of the model or an empty list if none or {@code null} if the specified model id does
     *         not refer to a known model.
     */
    List<Profile> getActivePomProfiles(String modelId);

    /**

Наприклад, ця модель вище оголошує JSON "`об'єкт`" (або Python `dict`), як:

```JSON
{
    "name": "Foo",
    "description": "An optional description",
    "price": 45.2,
    "tax": 3.5
}
```

...оскільки `description` і `tax` є необов'язковими (зі значенням за замовчуванням `None`), цей JSON "`об'єкт`" також буде дійсним:

```JSON