Python自帶日志處理模塊logging
默認的日志級別有DEBUG,INFO,WARNING,ERROR,CRITICAL，對應的函數是debug(),info(),warning(),error()和critical()
In [490]: import logging
In [491]: LOG_FILENAME='/tmp/example.log'
In [492]: logging.basicConfig(filename=LOG_FILENAME,level=logging.DEBUG)
In [493]: logging.debug('This message should go to the log file')
查看/tmp/example.log的內容
$ cat /tmp/example.log
DEBUG:root:This message should go to the log file
不斷執行
logging.debug('This message should go to the log file')
/tmp/example.log會不斷地刷新
日志輪轉
In [639]: import glob
In [640]: import logging
In [641]: import logging.handlers
In [642]: LOG_FILENAME='/tmp/logging_rotatingfile_example.out'
In [643]: my_logger=logging.getLogger('MyLogger')
In [644]: my_logger.setLevel(logging.DEBUG)
In [645]: handler=logging.handlers.RotatingFileHandler(LOG_FILENAME,maxBytes=20,backupCount=5)
In [646]: my_logger.addHandler(handler)
In [648]: for i in range(20):
my_logger.debug('i=%d' % i)
.....:
.....:
In [650]: logfiles=glob.glob('%s*' %LOG_FILENAME)
In [651]: for filename in logfiles:
.....: print filename
.....:
.....:
/tmp/logging_rotatingfile_example.out.1
/tmp/logging_rotatingfile_example.out.2
/tmp/logging_rotatingfile_example.out.5
/tmp/logging_rotatingfile_example.out.3
/tmp/logging_rotatingfile_example.out.4
/tmp/logging_rotatingfile_example.out
最近的日志文件總是名為logging_rotatingfile_example.out，一旦大小達到maxBytes設置的20字節，就將輪轉。
logging模塊最重要的一個功能就是可以根據設置的不同的日志級別輸出不同的日志信息。
import logging
import sys
LEVELS={'debug':logging.DEBUG,
'info' :logging.INFO,
'warning':logging.WARNING,
'error':logging.ERROR,
'critical':logging.CRITICAL
}
if sys.argv > 1:
level_name = sys.argv[1]
level=LEVELS.get(level_name,logging.NOTSET)
logging.basicConfig(level=level)
logging.debug('This is a debug message')
logging.info('This is a info message')
logging.warning('This is a warning message')
logging.error('This is a error message')
logging.critical('This is a critical error message')
~
~
$ python logging_level_example.py debug
DEBUG:root:This is a debug message
INFO:root:This is a info message
WARNING:root:This is a warning message
ERROR:root:This is a error message
CRITICAL:root:This is a critical error message
$ python logging_level_example.py info
INFO:root:This is a info message
WARNING:root:This is a warning message
ERROR:root:This is a error message
CRITICAL:root:This is a critical error message
$ python logging_level_example.py warning
WARNING:root:This is a warning message
ERROR:root:This is a error message
CRITICAL:root:This is a critical error message
$ python logging_level_example.py error
ERROR:root:This is a error message
CRITICAL:root:This is a critical error message
$ python logging_level_example.py critical
CRITICAL:root:This is a critical error message
logging模塊包括logger，handler，filter和formatter。
Logger.setLevel()設置日志級別
Logger.addFilter()
Logger.removeFilter()
Logger.debug()
Logger.info()
Logger.warning()
Logger.error()
Logger.critical()
Logger.exception()
Logger.log()
--------------------------------------分割線 --------------------------------------
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《Python開發技術詳解》.( 周偉,宗傑).[高清PDF掃描版+隨書視頻+代碼] http://www.linuxidc.com/Linux/2013-11/92693.htm
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