python笔记6–日志输出

功能

1. 输出基本log信息
2. 根据level级别输出log信息，方法1
3. 根据level级别输出log信息，方法2
4. 将log信息写到文本中
5. 将log信息写到文本中，同时输出到终端
6. 将日志输入到/var/log/syslog中

代码

#!/usr/bin/python3import logging
import sys
import syslogdef test_logging():'''func: 输出基本log信息'''logging.debug('debug message')logging.info('info message')logging.warning('warning message')logging.error('error message')logging.critical('critical message')def test_logging2(level=logging.INFO):"""根据level等级进行输出，方法1"""# set default logging configurationlogger = logging.getLogger()  # initialize logging classlogger.setLevel(level)  # default log levelformat = logging.Formatter("%(asctime)s [%(levelname)-8s][%(processName)s:%(process)d-%(threadName)s][%(filename)s:%(lineno)d][%(message)s]")  # output formatsh = logging.StreamHandler(stream=sys.stdout)  # output to standard outputsh.setFormatter(format)logger.addHandler(sh)# use logging to generate log ouputlogger.info("this is info")logger.debug("this is debug")logger.warning("this is warning")logging.error("this is error")logger.critical("this is critical")def test_logging3(level=logging.INFO):"""根据level等级进行输出，方法2"""logging.basicConfig(level=level, format='%(asctime)s [%(levelname)-8s][%(processName)s:%(process)d-%(threadName)s][%(filename)s:%(lineno)d][%(message)s]')logger = logging.getLogger()logger.info("this is info")logger.debug("this is debug")logger.warning("this is warning")logging.error("this is error")logger.critical("this is critical")def test_logging4(level=logging.INFO):"""将log信息输入到test.log文件中"""logger = logging.getLogger()logger.setLevel(level)format = logging.Formatter('%(asctime)s [%(levelname)-8s][%(processName)s:%(process)d-%(threadName)s][%(filename)s:%(lineno)d][%(message)s]')hander=logging.FileHandler('test.log')hander.setFormatter(format)logger.addHandler(hander)logger.info("this is info")logger.debug("this is debug")logger.warning("this is warning")logging.error("this is error")logger.critical("this is critical")def test_logging5(level=logging.INFO):"""将log信息输入到test.log文件中，同时输出到控制台"""logger = syslog.Slogger.setLevel(level)format = logging.Formatter('%(asctime)s [%(levelname)-8s][%(processName)s:%(process)d-%(threadName)s][%(filename)s:%(lineno)d][%(message)s]')hander=logging.FileHandler('test.log')hander.setFormatter(format)logger.addHandler(hander)console=logging.StreamHandler()console.setLevel(level)logger.addHandler(console)logger.debug("this is debug")logger.info("this is info")logger.warning("this is warning")logging.error("this is error")logger.critical("this is critical")def test_logging6():"""将log信息输入到syslog中"""syslog.syslog('This is test of syslog')if __name__ == '__main__':# test_logging()# test_logging2(logging.INFO)# test_logging3(logging.DEBUG)# test_logging4(logging.DEBUG)# test_logging5(logging.DEBUG)test_logging6()

注意：
若果需要显示具体行等信息，可以通过 traceback.print_exc() 来实现

import traceback
print(traceback.print_exc()) 

说明

笔者测试系统为Ubuntu1910，Python3.7.