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。