def _read_configuration_file(self, config_filename):
        """
        Reads parameters from the configuration file.

        :param str config_filename: The name of the configuration file.
        """
        config = configparser.ConfigParser()
        config.read(config_filename)

        self._constants_filename = config.get('constants', 'columns')
        self._prefix = config.get('constants', 'prefix')
        self._class_name = config.get('constants', 'class')
Reads parameters from the configuration file.

        :param str config_filename: The name of the configuration file.