从url解析文件名（请参阅相关问题此处 ）。然后，您可以通过向files.blobstore.create调用添加一个附加参数来设置它：

Parse the filename from the url (see related question here). Then you can set it by adding an additional parameter to your files.blobstore.create call:

file_name = files.blobstore.create(mime_type='image/png',_blobinfo_uploaded_filename=file_name_from_url)