把需要的所有东西都封装在一个方法中：

def init_log(save_path, mode='w'):import logginglogger = logging.getLogger() # 不加名称设置root loggerlevel = logging.DEBUGformatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s: - %(message)s', datefmt='%Y-%m-%d %H:%M:%S')logger.setLevel(level)# 写入文件fh = logging.FileHandler(save_path, mode=mode)fh.setLevel(level)fh.setFormatter(formatter)# 使用StreamHandler输出到屏幕ch = logging.StreamHandler()ch.setLevel(level)ch.setFormatter(formatter)# 添加两个Handlerlogger.addHandler(ch)logger.addHandler(fh)return logger

调用时，只需要使用：

logger = init_log('test_log.log')# 开始记录日志logger.debug('debug')logger.info('info')logger.warning('warning')logger.error('error')logger.critical('critial')

完整代码

def init_log(save_path, mode='w'):import logginglogger = logging.getLogger() # 不加名称设置root loggerlevel = logging.DEBUGformatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s: - %(message)s', datefmt='%Y-%m-%d %H:%M:%S')logger.setLevel(level)# 写入文件fh = logging.FileHandler(save_path, mode=mode)fh.setLevel(level)fh.setFormatter(formatter)# 使用StreamHandler输出到屏幕ch = logging.StreamHandler()ch.setLevel(level)ch.setFormatter(formatter)# 添加两个Handlerlogger.addHandler(ch)logger.addHandler(fh)return loggerif __name__ == '__main__':logger = init_log('test_log.log')logger.debug('debug')logger.info('info')logger.warning('warning')logger.error('error')logger.critical('critial')