code: def save(self, savefile):
          
          with open(str(savefile), 'wb') as f:
              self.write_to_fp(f)
              log.debug("Saved to %s", savefile)
docs: Do the TTS API request and write result to file.
  
          Args:
              savefile (string): The path and file name to save the ``mp3`` to.
  
          Raises:
              :class:`gTTSError`: When there's an error with the API request.