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  2. github.com/tiangolo/fastapi

    docs/zh/docs/tutorial/request-forms.md 

    # 表单数据

接收的不是 JSON，而是表单字段时，要使用 `Form`。

!!! info "说明"

    要使用表单，需预先安装 <a href="https://github.com/Kludex/python-multipart" class="external-link" target="_blank">`python-multipart`</a>。

    例如，`pip install python-multipart`。

## 导入 `Form`

从 `fastapi` 导入 `Form`：

```Python hl_lines="1"
{!../../../docs_src/request_forms/tutorial001.py!}
```

## 定义 `Form` 参数

创建表单（`Form`）参数的方式与 `Body` 和 `Query` 一样：
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  3. github.com/tiangolo/fastapi

    docs/en/docs/tutorial/request-forms-and-files.md 

    # Request Forms and Files

You can define files and form fields at the same time using `File` and `Form`.

!!! info
    To receive uploaded files and/or form data, first install <a href="https://github.com/Kludex/python-multipart" class="external-link" target="_blank">`python-multipart`</a>.

    E.g. `pip install python-multipart`.

## Import `File` and `Form`

=== "Python 3.9+"

    ```Python hl_lines="3"
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  4. github.com/tiangolo/fastapi

    docs_src/request_files/tutorial002_py39.py 

    
@app.get("/")
async def main():
    content = """
<body>
<form action="/files/" enctype="multipart/form-data" method="post">
<input name="files" type="file" multiple>
<input type="submit">
</form>
<form action="/uploadfiles/" enctype="multipart/form-data" method="post">
<input name="files" type="file" multiple>
<input type="submit">
</form>
</body>
    """
    Python
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  5. github.com/tiangolo/fastapi

    docs_src/request_files/tutorial003_py39.py 

    
@app.get("/")
async def main():
    content = """
<body>
<form action="/files/" enctype="multipart/form-data" method="post">
<input name="files" type="file" multiple>
<input type="submit">
</form>
<form action="/uploadfiles/" enctype="multipart/form-data" method="post">
<input name="files" type="file" multiple>
<input type="submit">
</form>
</body>
    """
    Python
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  6. github.com/tiangolo/fastapi

    tests/test_tuples.py 

        assert response.status_code == 422, response.text


def test_tuple_form_valid():
    response = client.post("/tuple-form/", data={"values": ("1", "2")})
    assert response.status_code == 200, response.text
    assert response.json() == [1, 2]


def test_tuple_form_invalid():
    response = client.post("/tuple-form/", data={"values": ("1", "2", "3")})
    assert response.status_code == 422, response.text
    Python
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  7. github.com/tiangolo/fastapi

    docs_src/request_forms/tutorial001.py 

    from fastapi import FastAPI, Form

app = FastAPI()


@app.post("/login/")
async def login(username: str = Form(), password: str = Form()):
    Python
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  8. github.com/tiangolo/fastapi

    tests/test_tutorial/test_request_forms/test_tutorial001.py 

        client = TestClient(app)
    return client


def test_post_body_form(client: TestClient):
    response = client.post("/login/", data={"username": "Foo", "password": "secret"})
    assert response.status_code == 200
    assert response.json() == {"username": "Foo"}


def test_post_body_form_no_password(client: TestClient):
    response = client.post("/login/", data={"username": "Foo"})
    Python
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  9. github.com/tiangolo/fastapi

    docs/zh/docs/tutorial/request-files.md 

    ## 什么是 「表单数据」

与 JSON 不同，HTML 表单（`<form></form>`）向服务器发送数据通常使用「特殊」的编码。

**FastAPI** 要确保从正确的位置读取数据，而不是读取 JSON。

!!! note "技术细节"

    不包含文件时，表单数据一般用 `application/x-www-form-urlencoded`「媒体类型」编码。

    但表单包含文件时，编码为 `multipart/form-data`。使用了 `File`，**FastAPI** 就知道要从请求体的正确位置获取文件。
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  10. github.com/tiangolo/fastapi

    docs/ru/docs/tutorial/request-files.md 

        **FastAPI** наследует `UploadFile` непосредственно из **Starlette**, но добавляет некоторые детали для совместимости с **Pydantic** и другими частями FastAPI.

## Про данные формы ("Form Data")

Способ, которым HTML-формы (`<form></form>`) отправляют данные на сервер, обычно использует "специальную" кодировку для этих данных, отличную от JSON.

**FastAPI** позаботится о том, чтобы считать эти данные из нужного места, а не из JSON.
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  11. github.com/tiangolo/fastapi

    fastapi/__init__.py 

    from .param_functions import Body as Body
from .param_functions import Cookie as Cookie
from .param_functions import Depends as Depends
from .param_functions import File as File
from .param_functions import Form as Form
from .param_functions import Header as Header
from .param_functions import Path as Path
from .param_functions import Query as Query
from .param_functions import Security as Security
from .requests import Request as Request
    Python
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