Adapter to dump/load INI format strings and files using standard library's
        ``ConfigParser`` (or the backported configparser module in Python 2).
        
        Returns:
            ConfigPersistenceAdapter

def configparser(self):
        """
        Adapter to dump/load INI format strings and files using standard library's
        ``ConfigParser`` (or the backported configparser module in Python 2).
        
        Returns:
            ConfigPersistenceAdapter
        """
        if self._configparser_adapter is None:
            self._configparser_adapter = ConfigPersistenceAdapter(
                config=self,
                reader_writer=ConfigParserReaderWriter(
                    config_parser_factory=self.settings.configparser_factory,
                ),
            )
        return self._configparser_adapter