logging 日志模块学习

logging

日志模块，用于记录系统在运行过程中的一些关键信息，以便于对系统的运行状况进行跟踪，所以还是灰常重要滴，下面我就来从入门到放弃的系统学习一下日志既可以在屏幕上显示，又可以在文件中体现。

简单的在屏幕上体现

logging.debug('This is debug message')
logging.info('This is info message')
logging.warning('This is warning message')

屏幕上打印:
WARNING:root:This is warning message　

默认情况下，logging将日志打印到屏幕，日志级别为WARNING；

日志级别大小关系为：CRITICAL > ERROR > WARNING > INFO > DEBUG > NOTSET，当然也可以自己定义日志级别

#/usr/bin/python
#coding:utf-8

import logging
import sys,os
import pdb

class MyLog(object):
'''
Usage:
mylog = MyLog()
logger = mylog.getLog()
logger.debug('test...')
logger.info('test...')
logger.warning('test...')
logger.error('test...')
logger.critical('test...')
默认日志输出到日志文件
缺省日志名字：调用者文件名后缀变为log
例如：my.py 调用mylog模块 则日志名字my.log
如果需要设置自己的日志名字则：mylog.setLog(filename,loglevel)

如果同时向输出到屏幕则需要使用：mylog.openConsole(self,is_control = True,log_level = None)方法
'''
debug = logging.DEBUG
info = logging.INFO
warning = logging.WARNING
error = logging.ERROR
critical = logging.CRITICAL

def __init__(self,log_level = logging.WARNING):
self.log_level = log_level
try:
self.default_log_file = os.path.basename(sys.argv[0]).split('.')[0] + '.log'
except:
self.default_log_file = os.path.basename(sys.argv[0]) + '.log'

logging.basicConfig(level=log_level,
format ='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
datefmt ='%a, %d %b %Y %H:%M:%S',
filename = self.default_log_file,
filemode ='w')
@classmethod
def _getFormatter(cls):
fmt = logging.Formatter(fmt ='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
datefmt ='%a, %d %b %Y %H:%M:%S')
return fmt

def getLog(self):
if not hasattr(self,'_logger'):
self._logger = logging.getLogger()
return self._logger

def setLog(self,log_filename = None,log_level = None):
if not hasattr(self,'_logger'):
self._logger = logging.getLogger()
else:
#_handler存在，则移除旧_handler
if hasattr(self,'_handler'):
self._logger.removeHandler(self._handler)

#实例化一个_hander
if log_filename is None:
log_filename = self.default_log_file
self._handler=logging.FileHandler(log_filename)

#set log Formatter
fmt = MyLog._getFormatter()
self._handler.setFormatter(fmt)

self._logger.addHandler(self._handler)

if log_level is None:
log_level = self.log_level
self._logger.setLevel(log_level)

def openConsole(self,is_control = True,log_level = None):
'''
默认输出屏幕级别与输出到日志的级别一致
如果关闭屏幕输出：is_control 设置为False
'''
if not hasattr(self,'_logger'):
self._logger = logging.getLogger()

if is_control:
fmt = MyLog._getFormatter()
self._console = logging.StreamHandler()
if log_level is not None:
try:
self._console.setLevel(log_level)
except:
raise Exception('log_level is Error!')
self._console.setFormatter(fmt)
self._logger.addHandler(self._console)
else:
if hasattr(self,'_console'):
self._logger.removeHandler(self._console)

if __name__=='__main__':
#pdb.set_trace()
mylog = MyLog()
mylog.setLog('11.log',logging.DEBUG)
logger = mylog.getLog()
mylog.openConsole()
logger.info('Test...')
mylog.openConsole(False)
logger.info('close console...')

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