Python Learning logging Module

Python comes with a log processing module logging

The default log level is debug,info,warning,error,critical, the corresponding function is debug (), INFO (), WARNING (), ERROR (), and CRITICAL ()

In [490]: Import Loggingin [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 ')

View/tmp/example.log's content

$ cat/tmp/example.log DEBUG:root:This message should go to the log file

Continuous implementation

Logging.debug (' This message should go to the log file ')

/tmp/example.log will continue to refresh

Log rotation

in [639]: import globin [640]: import loggingin [641]: import  Logging.handlersin [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 (: )    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

The most recent log file is always named Logging_rotatingfile_example.out, which is rotated once the size reaches the 20 bytes of the MaxBytes setting.

One of the most important features of the logging module is the ability to output different log information based on the different log levels set.

Reference Documentation:

Https://docs.python.org/2.6/library/logging.html#configuration-file-format

This article is from the Linux SA John blog, so be sure to keep this source http://john88wang.blog.51cto.com/2165294/1622501

Python Learning logging Module