概述

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。

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