code: def write(self, filehandle, file_format):
          
          try:
              if file_format == "json":
                  json_str = self._to_json()
                  filehandle.write(json_str)
              elif file_format == "mwtab":
                  mwtab_str = self._to_mwtab()
                  filehandle.write(mwtab_str)
              else:
                  raise TypeError("Unknown file format.")
          except IOError:
              raise IOError('"filehandle" parameter must be writable.')
          filehandle.close()
docs: Write :class:`~mwtab.mwtab.MWTabFile` data into file.
  
          :param filehandle: file-like object.
          :type filehandle: :py:class:`io.TextIOWrapper`
          :param str file_format: Format to use to write data: `mwtab` or `json`.
          :return: None
          :rtype: :py:obj:`None`