python实现的系统实用log类实例

本文实例讲述了python实现的系统实用log类。分享给大家供大家参考。具体如下：

每个系统都必不可少会需要一个log类，方便了解系统的运行状况和排错，python本身已经提供了一个logger了，很强大，只要稍微封装一下就可以放到自己的系统了，下面是我自己的log类

文件名：logger.py

"""This module takes care of the logging
logger helps in creating a logging system for the application
Logging is initialised by function LoggerInit.
"""
import logging
import os
import sys
class logger(object):
 """Class provides methods to perform logging."""
 m_logger = None
 def __init__(self, opts, logfile):
   """Set the default logging path."""
   self.opts = opts
   self.myname = 'dxscs'
   self.logdir = '.'
   self.logfile = logfile
   self.filename = os.path.join(self.logdir, self.logfile)
 def loginit(self):
   """Calls function LoggerInit to start initialising the logging system."""
   logdir = os.path.normpath(os.path.expanduser(self.logdir))
   self.logfilename = os.path.normpath(os.path.expanduser(self.filename))
   if not os.path.isdir(logdir):
     try:
       os.mkdir(logdir)
     except OSError, e:
       msg = ('(％s)'％e)
       print msg
       sys.exit(1)
   self.logger_init(self.myname)
 def logger_init(self, loggername):
   """Initialise the logging system.
   This includes logging to console and a file. By default, console prints
   messages of level WARN and above and file prints level INFO and above.
   In DEBUG mode (-D command line option) prints messages of level DEBUG
   and above to both console and file.
   Args:
    loggername: String - Name of the application printed along with the log
    message.
   """
   fileformat = '[％(asctime)s] ％(name)s: [％(filename)s: ％(lineno)d]: ％(levelname)-8s: ％(message)s'
   logger.m_logger = logging.getLogger(loggername)
   logger.m_logger.setLevel(logging.INFO)
   self.console = logging.StreamHandler()
   self.console.setLevel(logging.CRITICAL)
   consformat = logging.Formatter(fileformat)
   self.console.setFormatter(consformat)
   self.filelog = logging.FileHandler(filename=self.logfilename, mode='w+')
   self.filelog.setLevel(logging.INFO)
   self.filelog.setFormatter(consformat)
   logger.m_logger.addHandler(self.filelog)
   logger.m_logger.addHandler(self.console)
   if self.opts['debug'] == True:
     self.console.setLevel(logging.DEBUG)
     self.filelog.setLevel(logging.DEBUG)
     logger.m_logger.setLevel(logging.DEBUG)
   if not self.opts['nofork']:
     self.console.setLevel(logging.WARN)
 def logstop(self):
   """Shutdown logging process."""
   logging.shutdown()
#test    
if __name__ == '__main__':
 #debug mode & not in daemon
 opts = {'debug':True,'nofork':True}
 log = logger(opts, 'dxscs_source.log')
 log.loginit()
 log.m_logger.info('hello,world')

执行结果：

终端和文件中都显示有：[2012-09-06 16:56:01,498] dxscs: [logger.py: 88]: INFO    : hello,world

如果只需要显示在文件中可以将debug和nofork选项都置为false

希望本文所述对大家的Python程序设计有所帮助。