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。