```Python hl_lines="2-4"
{!../../../docs_src/dependencies/tutorial007.py!}
```

Полученное значение и есть то, что будет внедрено в функцию операции пути и другие зависимости:

```Python hl_lines="4"
{!../../../docs_src/dependencies/tutorial007.py!}
```

Код, следующий за оператором `yield`, выполняется после доставки ответа:

```Python hl_lines="5-6"
{!../../../docs_src/dependencies/tutorial007.py!}
```

!!! tip "Подсказка"

例如，您可以使用这种方式创建一个数据库会话，并在完成后关闭它。

在发送响应之前，只会执行 `yield` 语句及之前的代码：

```Python hl_lines="2-4"
{!../../../docs_src/dependencies/tutorial007.py!}
```

生成的值会注入到*路径操作*和其他依赖项中：

```Python hl_lines="4"
{!../../../docs_src/dependencies/tutorial007.py!}
```

"yield"语句后面的代码会在发送响应后执行：：

```Python hl_lines="5-6"
{!../../../docs_src/dependencies/tutorial007.py!}
```

!!! tip "提示"

    您可以使用 `async` 或普通函数。

```Python hl_lines="2-4"
{!../../../docs_src/dependencies/tutorial007.py!}
```

The yielded value is what is injected into *path operations* and other dependencies:

```Python hl_lines="4"
{!../../../docs_src/dependencies/tutorial007.py!}
```

The code following the `yield` statement is executed after the response has been delivered:

```Python hl_lines="5-6"
{!../../../docs_src/dependencies/tutorial007.py!}
```

!!! tip

    ```

=== "Python 3.8+"

    ```Python hl_lines="12"
    {!> ../../../docs_src/dependencies/tutorial001_an.py!}
    ```

=== "Python 3.10+ non-Annotated"

    !!! tip
        Prefer to use the `Annotated` version if possible.

    ```Python hl_lines="7"
    {!> ../../../docs_src/dependencies/tutorial001_py310.py!}
    ```

=== "Python 3.8+ non-Annotated"

    {!> ../../../docs_src/dependencies/tutorial008_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="17-18  25-26"
    {!> ../../../docs_src/dependencies/tutorial008_an.py!}
    ```

=== "Python 3.8+ nicht annotiert"

    !!! tip "Tipp"
        Bevorzugen Sie die `Annotated`-Version, falls möglich.

    ```Python hl_lines="16-17  24-25"
    {!> ../../../docs_src/dependencies/tutorial008.py!}

=== "Python 3.10+"

    ```Python hl_lines="9"
    {!> ../../../docs_src/dependencies/tutorial001_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="11"
    {!> ../../../docs_src/dependencies/tutorial001_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="12"
    {!> ../../../docs_src/dependencies/tutorial001_an.py!}
    ```

=== "Python 3.10+ nicht annotiert"

レスポンスを送信する前に`yield`文を含む前のコードのみが実行されます。

```Python hl_lines="2 3 4"
{!../../../docs_src/dependencies/tutorial007.py!}
```

生成された値は、*path operations*や他の依存関係に注入されるものです:

```Python hl_lines="4"
{!../../../docs_src/dependencies/tutorial007.py!}
```

`yield`文に続くコードは、レスポンスが送信された後に実行されます:

```Python hl_lines="5 6"
{!../../../docs_src/dependencies/tutorial007.py!}
```

!!! tip "豆知識"
    `async`や通常の関数を使用することができます。

You can define dependencies that in turn can define dependencies themselves.

In the end, a hierarchical tree of dependencies is built, and the **Dependency Injection** system takes care of solving all these dependencies for you (and their sub-dependencies) and providing (injecting) the results at each step.

Also fügen wir sie in ihr eigenes `dependencies`-Modul (`app/dependencies.py`) ein.

Wir werden nun eine einfache Abhängigkeit verwenden, um einen benutzerdefinierten `X-Token`-Header zu lesen:

=== "Python 3.9+"

    ```Python hl_lines="3  6-8" title="app/dependencies.py"
    {!> ../../../docs_src/bigger_applications/app_an_py39/dependencies.py!}
    ```

=== "Python 3.8+"

...👥 🎯.

* 👫 🔜 ™ ⏮️ 📇 🔖 👈 🔌 👁 🎻 `"items"`.
    * 👫 "🔖" ✴️ ⚠ 🏧 🎓 🧾 ⚙️ (⚙️ 🗄).
* 🌐 👫 🔜 🔌 🔁 `responses`.
* 🌐 👫 *➡ 🛠️* 🔜 ✔️ 📇 `dependencies` 🔬/🛠️ ⏭ 👫.
    * 🚥 👆 📣 🔗 🎯 *➡ 🛠️*, **👫 🔜 🛠️ 💁‍♂️**.
    * 📻 🔗 🛠️ 🥇, ⤴️ [`dependencies` 👨‍🎨](dependencies/dependencies-in-path-operation-decorators.md){.internal-link target=_blank}, & ⤴️ 😐 🔢 🔗.