docs: 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')