<img src="/img/tutorial/dependencies/image01.png">

## Einfache Verwendung { #simple-usage }

Näher betrachtet, werden *Pfadoperation-Funktionen* deklariert, um verwendet zu werden, wann immer ein *Pfad* und eine *Operation* übereinstimmen, und dann kümmert sich **FastAPI** darum, die Funktion mit den richtigen Parametern aufzurufen, die Daten aus dem Request extrahierend.

```Python
some_variable: PlaneItem | CarItem
```

하지만 이를 `response_model=PlaneItem | CarItem`과 같이 할당하면 에러가 발생합니다. 이는 Python이 이를 타입 어노테이션으로 해석하지 않고, `PlaneItem`과 `CarItem` 사이의 **잘못된 연산(invalid operation)**을 시도하기 때문입니다

## 모델 리스트

마찬가지로, 객체 리스트 형태의 응답을 선언할 수도 있습니다.

이를 위해 표준 Python의 `typing.List`를 사용하세요(또는 Python 3.9 이상에서는 단순히 `list`를 사용할 수 있습니다):

 * <p>{@link Stream} is similar to this class, but generally more powerful, and certainly more
 * standard. Key differences include:
 *
 * <ul>
 *   <li>A stream is <i>single-use</i>; it becomes invalid as soon as any "terminal operation" such
 *       as {@code findFirst()} or {@code iterator()} is invoked. (Even though {@code Stream}
 *       contains all the right method <i>signatures</i> to implement {@link Iterable}, it does not

                }
                _src = _src.deferred;
                this.e.decode(_src);

            }
        }
    }

    /**
     * DCE/RPC message for NetrDfsEnumEx operation to enumerate DFS entries
     */
    public static class NetrDfsEnumEx extends DcerpcMessage {

        @Override
        public int getOpnum() {
            return 0x15;
        }

        /**

	"github.com/minio/pkg/v3/wildcard"
	"github.com/minio/pkg/v3/workers"
)

const (
	bgHealingUUID = "0000-0000-0000-0000"
)

// NewBgHealSequence creates a background healing sequence
// operation which scans all objects and heal them.
func newBgHealSequence() *healSequence {
	reqInfo := &logger.ReqInfo{API: "BackgroundHeal"}
	ctx, cancelCtx := context.WithCancel(logger.SetReqInfo(GlobalContext, reqInfo))

- You can now have different operation names for different storage operations. This still prevents two operations on same volume from happening concurrently but if the operation changes, it resets the exponential backoff.
([#75213](https://github.com/kubernetes/kubernetes/pull/75213), [@gnufied](https://github.com/gnufied))

	startOffset, length, err := rs.GetOffsetLength(actualPartSize)
	if err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	// maximum copy size for multipart objects in a single operation
	if isMaxObjectSize(length) {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrEntityTooLarge), r.URL)
		return
	}

	if isRemoteCopyRequired(ctx, srcBucket, dstBucket, objectAPI) {

        timeoutConfig.setValue("123");
        optimizedHelper.setProperty(bean, "timeout", Long.class, timeoutConfig);
    }

    /**
     * Benchmark that tests multiple property configurations in a single operation.
     * This simulates a more realistic scenario where multiple properties are set on a bean.
     */
    @Benchmark
    public void benchmarkOriginalHelperMultipleProperties() throws Exception {

    //                                               -------
    /**
     * Displays the details of a related content item.
     *
     * @param crudMode the CRUD mode for the operation
     * @param id the ID of the related content item to display
     * @return HTML response for the details page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })

Comencemos con un ejemplo y luego veámoslo en detalle.

Creamos una función asíncrona `lifespan()` con `yield` así:

{* ../../docs_src/events/tutorial003_py39.py hl[16,19] *}