1.簡單的將日誌打印到屏幕python
import logging 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
默認狀況下,logging將日誌打印到屏幕,日誌級別爲WARNING;
日誌級別大小關係爲:CRITICAL > ERROR > WARNING > INFO > DEBUG > NOTSET,固然也能夠本身定義日誌級別。安全
2.經過logging.basicConfig函數對日誌的輸出格式及方式作相關配置服務器
import logging logging.basicConfig(level=logging.DEBUG, format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s', datefmt='%a, %d %b %Y %H:%M:%S', filename='myapp.log', filemode='w') logging.debug('This is debug message') logging.info('This is info message') logging.warning('This is warning message') ./myapp.log文件中內容爲: Sun, 24 May 2009 21:48:54 demo2.py[line:11] DEBUG This is debug message Sun, 24 May 2009 21:48:54 demo2.py[line:12] INFO This is info message Sun, 24 May 2009 21:48:54 demo2.py[line:13] WARNING This is warning message
logging.basicConfig函數各參數:
filename: 指定日誌文件名
filemode: 和file函數意義相同,指定日誌文件的打開模式,'w'或'a'
format: 指定輸出的格式和內容,format能夠輸出不少有用信息,如上例所示:
%(levelno)s: 打印日誌級別的數值
%(levelname)s: 打印日誌級別名稱
%(pathname)s: 打印當前執行程序的路徑,其實就是sys.argv[0]
%(filename)s: 打印當前執行程序名
%(funcName)s: 打印日誌的當前函數
%(lineno)d: 打印日誌的當前行號
%(asctime)s: 打印日誌的時間
%(thread)d: 打印線程ID
%(threadName)s: 打印線程名稱
%(process)d: 打印進程ID
%(message)s: 打印日誌信息
datefmt: 指定時間格式,同time.strftime()
level: 設置日誌級別,默認爲logging.WARNING
stream: 指定將日誌的輸出流,能夠指定輸出到sys.stderr,sys.stdout或者文件,默認輸出到sys.stderr,當stream和filename同時指定時,stream被忽略app
3.將日誌同時輸出到文件和屏幕socket
import logging logging.basicConfig(level=logging.DEBUG, format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s', datefmt='%a, %d %b %Y %H:%M:%S', filename='myapp.log', filemode='w') ################################################################################################# #定義一個StreamHandler,將INFO級別或更高的日誌信息打印到標準錯誤,並將其添加到當前的日誌處理對象# console = logging.StreamHandler() console.setLevel(logging.INFO) formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s') console.setFormatter(formatter) logging.getLogger('').addHandler(console) ################################################################################################# logging.debug('This is debug message') logging.info('This is info message') logging.warning('This is warning message') 屏幕上打印: root : INFO This is info message root : WARNING This is warning message ./myapp.log文件中內容爲: Sun, 24 May 2009 21:48:54 demo2.py[line:11] DEBUG This is debug message Sun, 24 May 2009 21:48:54 demo2.py[line:12] INFO This is info message Sun, 24 May 2009 21:48:54 demo2.py[line:13] WARNING This is warning message
4.logging之日誌回滾函數
import logging from logging.handlers import RotatingFileHandler ################################################################################################# #定義一個RotatingFileHandler,最多備份5個日誌文件,每一個日誌文件最大10M Rthandler = RotatingFileHandler('myapp.log', maxBytes=10*1024*1024,backupCount=5) Rthandler.setLevel(logging.INFO) formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s') Rthandler.setFormatter(formatter) logging.getLogger('').addHandler(Rthandler) ################################################################################################
從上例和本例能夠看出,logging有一個日誌處理的主對象,其它處理方式都是經過addHandler添加進去的。
logging的幾種handle方式以下:spa
logging.StreamHandler: 日誌輸出到流,能夠是sys.stderr、sys.stdout或者文件 logging.FileHandler: 日誌輸出到文件.net
日誌回滾方式,實際使用時用RotatingFileHandler和TimedRotatingFileHandler logging.handlers.BaseRotatingHandler logging.handlers.RotatingFileHandler logging.handlers.TimedRotatingFileHandler線程
logging.handlers.SocketHandler: 遠程輸出日誌到TCP/IP sockets debug
logging.handlers.DatagramHandler: 遠程輸出日誌到UDP sockets
logging.handlers.SMTPHandler: 遠程輸出日誌到郵件地址
logging.handlers.SysLogHandler: 日誌輸出到syslog
logging.handlers.NTEventLogHandler: 遠程輸出日誌到Windows NT/2000/XP的事件日誌
logging.handlers.MemoryHandler: 日誌輸出到內存中的制定buffer
logging.handlers.HTTPHandler: 經過"GET"或"POST"遠程輸出到HTTP服務器
因爲StreamHandler和FileHandler是經常使用的日誌處理方式,因此直接包含在logging模塊中,而其餘方式則包含在logging.handlers模塊中,
上述其它處理方式的使用請參見python2.5手冊!
5.經過logging.config模塊配置日誌
#logger.conf ############################################### [loggers] keys=root,example01,example02 [logger_root] level=DEBUG handlers=hand01,hand02 [logger_example01] handlers=hand01,hand02 qualname=example01 propagate=0 [logger_example02] handlers=hand01,hand03 qualname=example02 propagate=0 ############################################### [handlers] keys=hand01,hand02,hand03 [handler_hand01] class=StreamHandler level=INFO formatter=form02 args=(sys.stderr,) [handler_hand02] class=FileHandler level=DEBUG formatter=form01 args=('myapp.log', 'a') [handler_hand03] class=handlers.RotatingFileHandler level=INFO formatter=form02 args=('myapp.log', 'a', 10*1024*1024, 5) ############################################### [formatters] keys=form01,form02 [formatter_form01] format=%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s datefmt=%a, %d %b %Y %H:%M:%S [formatter_form02] format=%(name)-12s: %(levelname)-8s %(message)s datefmt=
import logging import logging.config logging.config.fileConfig("logger.conf") logger = logging.getLogger("example01") logger.debug('This is debug message') logger.info('This is info message') logger.warning('This is warning message')
import logging import logging.config logging.config.fileConfig("logger.conf") logger = logging.getLogger("example02") logger.debug('This is debug message') logger.info('This is info message') logger.warning('This is warning message')
6.logging是線程安全的
from:http://blog.csdn.net/yatere/article/details/6655445