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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