=== "Python 3.10+"

    In Python 3.9 or above, `Annotated` is part of the standard library, so you can import it from `typing`.

    ```Python hl_lines="1  3"
    {!> ../../../docs_src/query_params_str_validations/tutorial002_an_py310.py!}
    ```

=== "Python 3.8+"

    In versions of Python below Python 3.9 you import `Annotated` from `typing_extensions`.

## 纯列表请求体

如果你期望的 JSON 请求体的最外层是一个 JSON `array`（即 Python `list`），则可以在路径操作函数的参数中声明此类型，就像声明 Pydantic 模型一样：

```Python
images: List[Image]
```

例如：

=== "Python 3.9+"

    ```Python hl_lines="13"
    {!> ../../../docs_src/body_nested_models/tutorial008_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="15"
    {!> ../../../docs_src/body_nested_models/tutorial008.py!}
    ```

Now we will use the function `declarative_base()` that returns a class.

Later we will inherit from this class to create each of the database models or classes (the ORM models):

```Python hl_lines="13"
{!../../../docs_src/sql_databases/sql_app/database.py!}
```

## Create the database models

Let's now see the file `sql_app/models.py`.

### Create SQLAlchemy models from the `Base` class

```

:

=== "🐍 3️⃣.6️⃣ & 🔛"

    ```Python hl_lines="15"
    {!> ../../../docs_src/body_nested_models/tutorial008.py!}
    ```

=== "🐍 3️⃣.9️⃣ & 🔛"

    ```Python hl_lines="13"
    {!> ../../../docs_src/body_nested_models/tutorial008_py39.py!}
    ```

## 👨‍🎨 🐕‍🦺 🌐

& 👆 🤚 👨‍🎨 🐕‍🦺 🌐.

🏬 🔘 📇:

<img src="/img/tutorial/body-nested-models/image01.png">

=== "Python 3.9+"

    ```Python hl_lines="14"
    {!> ../../../docs_src/request_files/tutorial001_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="13"
    {!> ../../../docs_src/request_files/tutorial001_an.py!}
    ```

=== "Python 3.8+ nicht annotiert"

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

### `APIRouter` importieren

Sie importieren ihn und erstellen eine „Instanz“ auf die gleiche Weise wie mit der Klasse `FastAPI`:

```Python hl_lines="1  3" title="app/routers/users.py"
{!../../../docs_src/bigger_applications/app/routers/users.py!}
```

### *Pfadoperationen* mit `APIRouter`

Und dann verwenden Sie ihn, um Ihre *Pfadoperationen* zu deklarieren.

✋️ ⚫️ 🍕 🎏 **FastAPI** 🈸/🕸 🛠️ (⚫️ 🍕 🎏 "🐍 📦").

👆 💪 ✍ *➡ 🛠️* 👈 🕹 ⚙️ `APIRouter`.

### 🗄 `APIRouter`

👆 🗄 ⚫️ & ✍ "👐" 🎏 🌌 👆 🔜 ⏮️ 🎓 `FastAPI`:

```Python hl_lines="1  3" title="app/routers/users.py"
{!../../../docs_src/bigger_applications/app/routers/users.py!}
```

### *➡ 🛠️* ⏮️ `APIRouter`

& ⤴️ 👆 ⚙️ ⚫️ 📣 👆 *➡ 🛠️*.

⚙️ ⚫️ 🎏 🌌 👆 🔜 ⚙️ `FastAPI` 🎓: