How to use the tomcatmanager.cmd2_config.EvaluatingConfigParser function in tomcatmanager

def do_set(self, args):
        """
        Change a setting.
        
        Overrides cmd2.Cmd.do_set()
        """
        if args:
            config = EvaluatingConfigParser()
            setting_string = "[settings]\n{}".format(args)
            try:
                config.read_string(setting_string)
            except configparser.ParsingError as err:
                self.perror(str(err))
                self.exit_code = self.exit_codes.error
                return
            for param_name in config['settings']:
                if param_name in self.settable:
                    self._change_setting(param_name, config['settings'][param_name])
                    self.exit_code = self.exit_codes.success
                else:
                    self.perror("unknown setting: '{}'".format(param_name))
                    self.exit_code = self.exit_codes.error
        else:
            self.do_show(args)

def load_config(self):
        """Open and parse the user config file and set self.config."""
        config = None
        if self.config_file is not None:
            config = EvaluatingConfigParser()
            try:
                with open(self.config_file, 'r') as fobj:
                    config.read_file(fobj)
            except FileNotFoundError:
                pass
        try:
            settings = config['settings']
            for key in settings:
                self._change_setting(key, settings[key])
        except KeyError:
            pass
        except ValueError:
            pass
        self.config = config