This is quite simple (not very useful), but will help us focus on how the sub-dependencies work.

## Second dependency, "dependable" and "dependant"

Then you can create another dependency function (a "dependable") that at the same time declares a dependency of its own (so it is a "dependant" too):

//// tab | Python 3.10+

```Python hl_lines="13"
{!> ../../docs_src/dependencies/tutorial005_an_py310.py!}
```

////

* Les arguments nommés à passer à la fonction de tâche (`message="some notification"`).

## Injection de dépendances

Utiliser `BackgroundTasks` fonctionne aussi avec le système d'injection de dépendances. Vous pouvez déclarer un paramètre de type `BackgroundTasks` à différents niveaux : dans une *fonction de chemin*, dans une dépendance, dans une sous-dépendance...

## Zweite Abhängigkeit, „Dependable“ und „Dependant“

Dann können Sie eine weitere Abhängigkeitsfunktion (ein „Dependable“) erstellen, die gleichzeitig eine eigene Abhängigkeit deklariert (also auch ein „Dependant“ ist):

//// tab | Python 3.10+

```Python hl_lines="13"
{!> ../../docs_src/dependencies/tutorial005_an_py310.py!}
```

////

Isso é bastante simples (e não muito útil), mas irá nos ajudar a focar em como as subdependências funcionam.

## Segunda dependência, "injetável" e "dependente"

Então, você pode criar uma outra função para uma dependência (um "injetável") que ao mesmo tempo declara sua própria dependência (o que faz dela um "dependente" também):

//// tab | Python 3.10+

```Python hl_lines="13"
{!> ../../docs_src/dependencies/tutorial005_an_py310.py!}
```

    private void blackList(String id) {
        if (!blackList.contains(id)) {
            blackList.add(id);

            List<String> dependents = sorter.getDependents(id);

            if (dependents != null && !dependents.isEmpty()) {
                for (String dependentId : dependents) {
                    if (!buildSuccessesByProject.containsKey(dependentId)

@dataclass
class Dependant:
    path_params: List[ModelField] = field(default_factory=list)
    query_params: List[ModelField] = field(default_factory=list)
    header_params: List[ModelField] = field(default_factory=list)
    cookie_params: List[ModelField] = field(default_factory=list)
    body_params: List[ModelField] = field(default_factory=list)
    dependencies: List["Dependant"] = field(default_factory=list)

     */
    @Nonnull
    Optional<Boolean> alsoMake();

    /**
     * Indicates whether Maven should also build the specified projects' dependents.
     *
     * @return an {@link Optional} containing true if dependents should also be built, false if not, or empty if not specified
     */
    @Nonnull
    Optional<Boolean> alsoMakeDependents();

    /**

			},
			namespaces: corev1.NamespaceList{
				Items: []corev1.Namespace{
					{
						ObjectMeta: metav1.ObjectMeta{
							Name:   "dependent",
							Labels: map[string]string{label.IoIstioRev.Name: "test"},
						},
					},
				},
			},
			outputMatches: []string{"test", "revision", "dependent"},
			error:         "",
		},
	}

	for _, tc := range tcs {
		t.Run(tc.name, func(t *testing.T) {

    /**
     * Expands a version range to a list of matching versions, in ascending order.
     * For example, resolves "[3.8,4.0)" to "3.8", "3.8.1", "3.8.2".
     * The returned list of versions is only dependent on the configured repositories and their contents.
     * The supplied request may also refer to a single concrete version rather than a version range.

---

## Installer FastAPI

La première étape consiste à installer FastAPI.

Pour le tutoriel, vous voudrez peut-être l'installer avec toutes les dépendances et fonctionnalités optionnelles :

<div class="termy">

```console
$ pip install fastapi[all]

---> 100%
```

</div>