code: def _parse_extra(self, fp):
          comment = ''
          section = ''
          fp.seek(0)
          for line in fp:
              line = line.rstrip()
              if not line:
                  if comment:
                      comment += '\n'
                  continue
              if line.startswith('
                  comment += line + '\n'
                  continue
              if line.startswith('['):
                  section = line.strip('[]')
                  self._add_dot_key(section)
                  if comment:
                      self._comments[section] = comment.rstrip()
              elif CONFIG_KEY_RE.match(line):
                  key = line.split('=', 1)[0].strip()
                  self._add_dot_key(section, key)
                  if comment:
                      self._comments[(section, key)] = comment.rstrip()
              comment = ''
          if comment:
              self._comments[self.LAST_COMMENT_KEY] = comment