I'm programatically uploading image files and want to set the filename. When I upload a file via POST, the filename property is set automatically. However when using the method below, the filename is not getting set.

        image = urllib2.urlopen(url)
        file_name = files.blobstore.create(mime_type='image/png')
        with files.open(file_name, 'a') as f:
            f.write(image.read())
        files.finalize(file_name)  
        image_blob_key = files.blobstore.get_blob_key(file_name)
python google-app-engine blobstore
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