from fastapi import Depends


async def dependency_a():
    dep_a = generate_dep_a()
    try:
        yield dep_a
    finally:
        dep_a.close()


async def dependency_b(dep_a=Depends(dependency_a)):
    dep_b = generate_dep_b()
    try:
        yield dep_b
    finally:
        dep_b.close(dep_a)


async def dependency_c(dep_b=Depends(dependency_b)):
    dep_c = generate_dep_c()
    try:
        yield dep_c

Por ejemplo, `dependency_c` puede tener una dependencia de `dependency_b`, y `dependency_b` de `dependency_a`:

{* ../../docs_src/dependencies/tutorial008_an_py39.py hl[6,14,22] *}

Y todas ellas pueden usar `yield`.

En este caso, `dependency_c`, para ejecutar su código de salida, necesita que el valor de `dependency_b` (aquí llamado `dep_b`) todavía esté disponible.

Например, `dependency_c` может зависеть от `dependency_b`, а `dependency_b` — от `dependency_a`:

{* ../../docs_src/dependencies/tutorial008_an_py39.py hl[6,14,22] *}

И все они могут использовать `yield`.

В этом случае `dependency_c` для выполнения своего кода выхода нуждается в том, чтобы значение из `dependency_b` (здесь `dep_b`) всё ещё было доступно.

Beispielsweise kann `dependency_c` von `dependency_b` und `dependency_b` von `dependency_a` abhängen:

{* ../../docs_src/dependencies/tutorial008_an_py39.py hl[6,14,22] *}

Und alle können `yield` verwenden.

In diesem Fall benötigt `dependency_c` zum Ausführen seines Exit-Codes, dass der Wert von `dependency_b` (hier `dep_b` genannt) verfügbar ist.

**FastAPI** will make sure that the "exit code" in each dependency with `yield` is run in the correct order.

For example, `dependency_c` can have a dependency on `dependency_b`, and `dependency_b` on `dependency_a`:

{* ../../docs_src/dependencies/tutorial008_an_py39.py hl[6,14,22] *}

And all of them can use `yield`.

In this case `dependency_c`, to execute its exit code, needs the value from `dependency_b` (here named `dep_b`) to still be available.

Por exemplo, `dependency_c` pode depender de `dependency_b`, e `dependency_b` depender de `dependency_a`:

{* ../../docs_src/dependencies/tutorial008_an_py39.py hl[6,14,22] *}

E todas elas podem utilizar `yield`.

Neste caso, `dependency_c`, para executar seu código de saída, precisa que o valor de `dependency_b` (nomeado de `dep_b` aqui) continue disponível.

**FastAPI**는 `yield`를 사용하는 각 의존성의 "종료 코드"가 올바른 순서로 실행되도록 보장합니다.

예를 들어, `dependency_c`는 `dependency_b`에 의존할 수 있고, `dependency_b`는 `dependency_a`에 의존할 수 있습니다.

{* ../../docs_src/dependencies/tutorial008_an_py39.py hl[6,14,22] *}

이들 모두는 `yield`를 사용할 수 있습니다.

이 경우 `dependency_c`는 종료 코드를 실행하기 위해, `dependency_b`의 값 (여기서는 `dep_b`로 명명)이 여전히 사용 가능해야 합니다.

그리고, `dependency_b`는 종료 코드를 위해 `dependency_a`의 값 (여기서는 `dep_a`로 명명) 이 사용 가능해야 합니다.

 *
 * @since 4.0.0
 */
@Experimental
@Immutable
public interface Dependency extends Artifact {
    /**
     * {@return the type of the dependency}.
     * A dependency can be a <abbr>JAR</abbr> file,
     * a modular-<abbr>JAR</abbr> if it is intended to be placed on the module path,
     * a <abbr>JAR</abbr> containing test classes, <i>etc.</i>

    private Project project;

    /**
     * <p>setUp.</p>
     */
    @BeforeEach
    void setUp() {
        Dependency dependency1 = new Dependency();
        dependency1.setArtifactId("dep1");
        Dependency dependency2 = new Dependency();
        dependency2.setArtifactId("dep2");

        project = new Project();
        project.setModelVersion("4.0.0");
        project.setGroupId("org.apache.maven");

        Element dependency = dependencies.child("dependency").orElse(null);
        assertNotNull(dependency, "dependency should exist");

        // Insert elements in dependency according to dependency ordering
        DomUtils.insertContentElement(dependency, "scope", "test");
        DomUtils.insertContentElement(dependency, "type", "jar");

        String xmlOutput = DomUtils.toXml(doc);