code: def _write_line(self, indent_string, entry, this_entry, comment):
          
          # NOTE: the calls to self._quote here handles non-StringType values.
          if not self.unrepr:
              val = self._decode_element(self._quote(this_entry))
          else:
              val = repr(this_entry)
          return '%s%s%s%s%s' % (indent_string,
                                 self._decode_element(self._quote(entry, multiline=False)),
                                 self._a_to_u(' = '),
                                 val,
                                 self._decode_element(comment))
docs: Write an individual line, for the write method