def _read_configuration_file(self, config_filename):
config = configparser.ConfigParser()<EOL>config.read(config_filename)<EOL>self._constants_filename = config.get('<STR_LIT>', '<STR_LIT>')<EOL>self._prefix = config.get('<STR_LIT>', '<STR_LIT>')<EOL>self._class_name = config.get('<STR_LIT>', '<STR_LIT:class>')<EOL>
Reads parameters from the configuration file.

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