///

### `yield from` { #yield-from }

Когда вы итерируетесь по чему‑то, например, по «файлоподобному» объекту, и делаете `yield` для каждого элемента, вы можете также использовать `yield from`, чтобы отдавать каждый элемент напрямую и не писать цикл `for`.

Это не специфично для FastAPI, это просто Python, но полезный приём. 😎

        // We verify the effects of the super constructor by checking the fields of the created object.

        // Assert object_attributes fields
        assertNotNull(msrpcLsarOpenPolicy2.object_attributes);
        assertEquals(24, msrpcLsarOpenPolicy2.object_attributes.length);

        // Assert security_quality_of_service fields
        assertNotNull(msrpcLsarOpenPolicy2.object_attributes.security_quality_of_service);

///

### `yield from` { #yield-from }

Quando você está iterando sobre algo, como um objeto semelhante a arquivo, e faz `yield` para cada item, você também pode usar `yield from` para produzir cada item diretamente e pular o loop `for`.

    for line in message.splitlines():
        yield line


@app.get("/story/stream-no-async", response_class=StreamingResponse)
def stream_story_no_async() -> Iterable[str]:
    for line in message.splitlines():
        yield line


@app.get("/story/stream-no-annotation", response_class=StreamingResponse)
async def stream_story_no_annotation():
    for line in message.splitlines():
        yield line

# Additional highlighted fields for queries.
query.additional.highlighted.fields=
# Additional search fields for queries.
query.additional.search.fields=
# Additional facet fields for queries.
query.additional.facet.fields=
# Additional sort fields for queries.
query.additional.sort.fields=
# Additional analyzed fields for queries.
query.additional.analyzed.fields=
# Additional not-analyzed fields for queries.

        // Get all public static final fields of HtmlNext type
        Field[] fields = FessHtmlPath.class.getDeclaredFields();
        for (Field field : fields) {
            int modifiers = field.getModifiers();
            if (Modifier.isPublic(modifiers) && Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) {
                if (field.getType().equals(HtmlNext.class)) {

            parser.setDefaultOperator(StandardQueryConfigHandler.Operator.AND);

            // Parse with the first field if available, otherwise use "default"
            String defaultField = fields != null && fields.length > 0 ? fields[0] : "default";
            termQueryList = getTermQueryList(parser.parse(q, defaultField), fields);
        } catch (final Exception e) {
            return keywords;
        }

///

### `yield from` { #yield-from }

Lorsque vous itérez sur quelque chose, comme un objet de type fichier, et que vous faites un `yield` pour chaque élément, vous pouvez aussi utiliser `yield from` pour émettre chaque élément directement et éviter la boucle `for`.

///

### Lifespan fonksiyonu { #lifespan-function }

Dikkat edilmesi gereken ilk şey, `yield` içeren async bir fonksiyon tanımlıyor olmamız. Bu, `yield` kullanan Dependencies’e oldukça benzer.

{* ../../docs_src/events/tutorial003_py310.py hl[14:19] *}

Fonksiyonun `yield`’den önceki kısmı, uygulama başlamadan **önce** çalışır.

`yield`’den sonraki kısım ise, uygulama işini bitirdikten **sonra** çalışır.

0.121.0 버전에서 FastAPI는 `Depends(scope="function")` 지원을 추가했습니다.

`Depends(scope="function")`를 사용하면, `yield` 이후의 종료 코드는 *경로 처리 함수*가 끝난 직후(클라이언트에 응답이 반환되기 전)에 실행됩니다.

그리고 `Depends(scope="request")`(기본값)를 사용하면, `yield` 이후의 종료 코드는 응답이 전송된 후에 실행됩니다.

자세한 내용은 [`yield`가 있는 의존성 - 조기 종료와 `scope`](../tutorial/dependencies/dependencies-with-yield.md#early-exit-and-scope) 문서를 참고하세요.