Python自带日志处理模块logging
默认的日志级别有DEBUG,INFO,WARNING,ERROR,CRITICAL，对应的函数是debug(),info(),warning(),error()和critical()
In [490]: import logging In [491]: LOG_FILENAME=‘/tmp/example.log‘ In [492]: logging.basicConfig(filename=LOG_FILENAME,level=logging.DEBUG) In [493]: logging.debug(‘This message should go to the log file‘)
查看/tmp/example.log的内容
$ cat /tmp/example.log DEBUG:root:This message should go to the log file
不断执行
logging.debug(‘This message should go to the log file‘)
/tmp/example.log会不断地刷新
日志轮转
In [639]: import glob In [640]: import logging In [641]: import logging.handlers In [642]: LOG_FILENAME=‘/tmp/logging_rotatingfile_example.out‘ In [643]: my_logger=logging.getLogger(‘MyLogger‘) In [644]: my_logger.setLevel(logging.DEBUG) In [645]: handler=logging.handlers.RotatingFileHandler(LOG_FILENAME,maxBytes=20,backupCount=5) In [646]: my_logger.addHandler(handler) In [648]: for i in range(20): my_logger.debug(‘i=%d‘ % i) .....: .....: In [650]: logfiles=glob.glob(‘%s*‘ %LOG_FILENAME) In [651]: for filename in logfiles: .....: print filename .....: .....: /tmp/logging_rotatingfile_example.out.1 /tmp/logging_rotatingfile_example.out.2 /tmp/logging_rotatingfile_example.out.5 /tmp/logging_rotatingfile_example.out.3 /tmp/logging_rotatingfile_example.out.4 /tmp/logging_rotatingfile_example.out
最近的日志文件总是名为logging_rotatingfile_example.out，一旦大小达到maxBytes设置的20字节，就将轮转。
logging模块最重要的一个功能就是可以根据设置的不同的日志级别输出不同的日志信息。
参考文档：
https://docs.python.org/2.6/library/logging.html#configuration-file-format
本文出自 “Linux SA John” 博客，请务必保留此出处http://john88wang.blog.51cto.com/2165294/1622501
原文地址：http://john88wang.blog.51cto.com/2165294/1622501
