```Python hl_lines="9  17"
    {!> ../../../docs_src/request_files/tutorial001_02_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="9  17"
    {!> ../../../docs_src/request_files/tutorial001_02_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="10  18"
    {!> ../../../docs_src/request_files/tutorial001_02_an.py!}
    ```

=== "Python 3.10+ non-Annotated"

    !!! tip

    ```Python hl_lines="9  17"
    {!> ../../../docs_src/request_files/tutorial001_02_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="9  17"
    {!> ../../../docs_src/request_files/tutorial001_02_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="10  18"
    {!> ../../../docs_src/request_files/tutorial001_02_an.py!}
    ```

=== "Python 3.10+ nicht annotiert"

    ```Python hl_lines="9  17"
    {!> ../../../docs_src/request_files/tutorial001_02_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="9  17"
    {!> ../../../docs_src/request_files/tutorial001_02_an_py39.py!}
    ```

=== "Python 3.6+"

    ```Python hl_lines="10  18"
    {!> ../../../docs_src/request_files/tutorial001_02_an.py!}
    ```

=== "Python 3.10+ без Annotated"

    ```Python hl_lines="9  17"
    {!> ../../../docs_src/request_files/tutorial001_02.py!}
    ```

=== "🐍 3️⃣.1️⃣0️⃣ & 🔛"

    ```Python hl_lines="7  14"
    {!> ../../../docs_src/request_files/tutorial001_02_py310.py!}
    ```

## `UploadFile` ⏮️ 🌖 🗃

👆 💪 ⚙️ `File()` ⏮️ `UploadFile`, 🖼, ⚒ 🌖 🗃:

```Python hl_lines="13"
{!../../../docs_src/request_files/tutorial001_03.py!}
```

## 💗 📁 📂

    这不是 **FastAPI** 的问题，而是 HTTP 协议的规定。

## 可选文件上传

您可以通过使用标准类型注解并将 None 作为默认值的方式将一个文件参数设为可选:

=== "Python 3.9+"

    ```Python hl_lines="7  14"
    {!> ../../../docs_src/request_files/tutorial001_02_py310.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="9  17"
    {!> ../../../docs_src/request_files/tutorial001_02.py!}
    ```

## 带有额外元数据的 `UploadFile`