tornado_handler_upload.py

class FileUploadHandler(BaseHandler):
    """
    File upload handler inbehrits the BaseHandler, obtains file data from a POST call
    """
    def post(self):
        # Retrieve file from the request
        fileinfo = self.request.files['file'][0] 
        filename = fileinfo['filename']
        content_type = fileinfo['content_type']
        file_body = fileinfo['body']

        # Saving file to directory
        output_file_path = os.path.join('uploads', filename)
        with open(output_file_path, 'wb') as output_file:
            output_file.write(file_body)

        self.set_status(200)
        self.write(f"File '{filename}' with content type '{content_type}' uploaded and saved.")
        self.finish()