code: def __add_mime_types(self):
      for i, ext in enumerate(self.extname):
          mimetypes.add_type(
              self.mimetypes[i] or "application/octet-stream", ext
          )
  
imports: import os
  import mimetypes
  from flask import Response, send_from_directory
label_desc: Use image node_id 3 for calling the Template obj's underlying member method code with example usage: obj.__add_mime_types() without return types