# 请求表单与文件

FastAPI 支持同时使用 `File` 和 `Form` 定义文件和表单字段。

/// info | "说明"

接收上传文件或表单数据，要预先安装 <a href="https://github.com/Kludex/python-multipart" class="external-link" target="_blank">`python-multipart`</a>。

例如，`pip install python-multipart`。

///

## 导入 `File` 与 `Form`

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

## 定义 `File` 与 `Form` 参数

创建文件和表单参数的方式与 `Body` 和 `Query` 一样：

nsStart:"Du måste åtminstone välja ",badNumberOfSelectedOptionsEnd:" svarsalternativ",badAlphaNumeric:"Du kan endast svara med alfanumersika tecken (a-z och siffror)",badAlphaNumericExtra:" och ",wrongFileSize:"Filen du försöker ladda upp är för stor (max %s)",wrongFileType:"Endast filer av typen %s är tillåtna",groupCheckedRangeStart:"Välj mellan ",groupCheckedTooFewStart:"Då måste göra minst ",groupCheckedTooManyStart:"Du får inte göra fler än ",groupCheckedEnd:" val",badCreditCard:"Du har angett...

Joe Tsai <******@****.***> 1472512232 -0700

	DB.First(&animal, animal.Counter)
	if animal.Name != "amazing horse" {
		t.Errorf("Update a filed with a default value should occur. But got %v\n", animal.Name)
	}

	// When changing a field with a default value with blank value
	animal.Name = ""
	DB.Save(&animal)
	DB.First(&animal, animal.Counter)
	if animal.Name != "" {
		t.Errorf("Update a filed to blank with a default value should occur. But got %v\n", animal.Name)
	}

Joe Tsai <******@****.***> 1503528984 -0700

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