当你需要接收表单字段而不是 JSON 时，可以使用 `Form`。

/// info

要使用表单，首先安装 [`python-multipart`](https://github.com/Kludex/python-multipart)。

请先创建并激活一个[虚拟环境](../virtual-environments.md)，然后再进行安装，例如：

```console
$ pip install python-multipart
```

///

## 导入 `Form` { #import-form }

从 `fastapi` 导入 `Form`：

{* ../../docs_src/request_forms/tutorial001_an_py310.py hl[3] *}

## 定义 `Form` 参数 { #define-form-parameters }

Make sure you create a [virtual environment](../../virtual-environments.md), activate it, and then install `pyjwt`:

<div class="termy">

```console
$ pip install pyjwt

---> 100%
```

</div>

/// info

If you are planning to use digital signature algorithms like RSA or ECDSA, you should install the cryptography library dependency `pyjwt[crypto]`.

JSONの代わりにフィールドを受け取る場合は、`Form`を使用します。

/// info | 情報

フォームを使うためには、まず[`python-multipart`](https://github.com/Kludex/python-multipart)をインストールします。

必ず[仮想環境](../virtual-environments.md)を作成して有効化してから、例えば次のようにインストールしてください:

```console
$ pip install python-multipart
```

///

## `Form`のインポート { #import-form }

`fastapi`から`Form`をインポートします:

{* ../../docs_src/request_forms/tutorial001_an_py310.py hl[3] *}

                "To install, run: pip install email-validator"
            )
            return str(v)

        @classmethod
        def _validate(cls, __input_value: Any, _: Any) -> str:
            logger.warning(
                "email-validator not installed, email fields will be treated as str.\n"
                "To install, run: pip install email-validator"
            )

# FastAPI CLI { #fastapi-cli }

**FastAPI <abbr title="command line interface - 명령줄 인터페이스">CLI</abbr>**는 FastAPI 애플리케이션을 서빙하고, FastAPI 프로젝트를 관리하는 등 다양한 작업에 사용할 수 있는 커맨드 라인 프로그램입니다.

FastAPI를 설치하면(예: `pip install "fastapi[standard]"`) 터미널에서 실행할 수 있는 커맨드 라인 프로그램이 함께 제공됩니다.

개발용으로 FastAPI 애플리케이션을 실행하려면 `fastapi dev` 명령어를 사용할 수 있습니다:

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> dev

from tensorflow.python.compat import v2_compat as _compat
_compat.enable_v2_behavior()
_major_api_version = 2


# Load all plugin libraries from site-packages/tensorflow-plugins if we are
# running under pip.
# TODO(gunan): Find a better location for this code snippet.
from tensorflow.python.framework import load_library as _ll
from tensorflow.python.lib.io import file_io as _fi

    'You can install "python-multipart" with: \n\n'
    "pip install python-multipart\n"
)
multipart_incorrect_install_error = (
    'Form data requires "python-multipart" to be installed. '
    'It seems you installed "multipart" instead. \n'
    'You can remove "multipart" with: \n\n'
    "pip uninstall multipart\n\n"
    'And then install "python-multipart" with: \n\n'
    "pip install python-multipart\n"
)

Make sure you create a [virtual environment](../virtual-environments.md), activate it, and install `websockets` (a Python library that makes it easy to use the "WebSocket" protocol):

<div class="termy">

```console
$ pip install websockets

---> 100%
```

</div>

## WebSockets client { #websockets-client }

### In production { #in-production }

**FastAPI <abbr title="command line interface">CLI</abbr>** is a command line program that you can use to serve your FastAPI app, manage your FastAPI project, and more.

When you install FastAPI (e.g. with `pip install "fastapi[standard]"`), it comes with a command line program you can run in the terminal.

To run your FastAPI app for development, you can use the `fastapi dev` command:

<div class="termy">

```console

Make sure you create a [virtual environment](../virtual-environments.md), activate it, and then install it, for example:

```console
$ pip install email-validator
```

or with:

```console
$ pip install "pydantic[email]"
```

///

And we are using this model to declare our input and the same model to declare our output: