def Authentication(self): path = MainCore() file = configparser.ConfigParser() file.read(path.resource('config.ini')) operation = MySQL(file.get('DATABASE', 'host'), file.get('DATABASE', 'user'), file.get('DATABASE', 'password'), file.get('DATABASE', 'database')) result = operation.user_login(self.user_name.text(), self.password.text()) if len(list(result[1])) == 0: self.label_error.setStyleSheet('color: red') self.label_error.setText('Access denied !') else: permission = result[1][0] RootWindow.show() self.close()