从Flask请求模块读取文件 [英] Read-in Files from Flask request module

问题描述

我正在尝试从Python请求中读取文件，形成数据.我要做的就是读入请求主体中的传入文件，解析内容，然后将内容作为json主体返回.我在这里看到了很多示例，例如: if.request.files:中的文件名"，但是这对我来说永远行不通.我知道该文件实际上确实存在于ImmutableMultiDict类型内.这是我的工作代码示例:

I am trying to read-in a file from a Python request, form data. All I want to do is read-in the incoming file in the request body, parse the contents and return the contents as a json body. I see many examples out there like: if 'filename' in request.files:, however this never works for me. I know that the file does in fact live within the ImmutableMultiDict type. Here is my working code example:

if 'my_file.xls' in request.files:
    # do something

else:
    # return error

推荐答案

if 'file' in request.files:

这是在寻找与您以以下形式设置的 name 属性相对应的字段名称'file':

This is looking for the field name 'file' which corresponds to the name attribute you set in the form:

  <input type='file' name='file'>

然后，您需要执行类似的操作，将 FileStorage 对象分配给变量 mem :

You then need to do something like this to assign the FileStorage object to the variable mem:

mem = request.files['file']

有关如何以及为什么的详细信息，请参见我最近的回答.

See my recent answer for more details of how and why.

然后您可以使用以下命令访问文件名本身:

You can then access the filename itself with:

mem.filename # should give back 'my_file.xls' 

要实际读取流数据，请执行以下操作:

To actually read the stream data:

mem.read()

官方烧瓶文档对此有更多信息，以及如何使用 secure_filename()等保存到磁盘.可能值得一读.

The official flask docs have further info on this, and how to save to disk with secure_filename() etc. Probably worth a read.

我要做的就是在请求正文中读入文件，解析内容并将其作为json正文返回.

All I want to do is read-in the incoming file in the request body, parse the contents and return the contents as a json body.

如果您实际上想读取该Excel文件的内容，则需要使用与此兼容的库，例如 xlrd .此答案演示了如何打开工作簿并将其作为流传递.请注意，他们使用 fileobj 作为变量名，而不是 mem .

If you actually want to read the contents of that Excel file, then you'll need to use a library which has compatibility for this such as xlrd. this answer demonstrates how to open a workbook, passing it as a stream. Note that they have used fileobj as the variable name, instead of mem.

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