docs: def _one_to_one(self):
          """Perform one-to-one file conversion.
          :return: None
          :rtype: :py:obj:`None`
          """
          if not self.file_generator.to_path_compression:
              self._to_textfile(self.file_generator)
          elif self.file_generator.to_path_compression == "gz":
              self._to_gzipfile(self.file_generator)
          elif self.file_generator.to_path_compression == "bz2":
              self._to_bz2file(self.file_generator)
          elif self.file_generator.to_path_compression in ("tar", "tar.gz", "tar.bz2", "zip"):
              raise TypeError('One-to-many conversion, cannot convert "{}" into "{}"'.format(self.file_generator.from_path,
                                                                                             self.file_generator.to_path))
          else:
              raise TypeError('Unknown format: "{}"'.format(self.file_generator.to_path))