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1. loggingÖ±½ÓÊä³öÈÕÖ¾£¬Èçlogging.info()Óëlog = logging.getLogger('name') log.info()ÓÐʲô²»Í¬£¿
2. ¡°No handlers could be found for logger¡±ÊÇÔõô»ØÊ£¿
3. root loggerÓÐʲôÓã¬ÈçºÎ»ñµÃ£¿
4. ÐÎÈç"a.b.c"µÄloggerÃûÓÐʲôÓã¿
5. Èç¹ûÒ»¸öloggerÖ´Ðжà´ÎaddHandler£¬ÄÇôÿ¸öhandler¶¼»á±»Ö´ÐÐÂð£¿
6. loggerµÄ´«²¥(propagate)ÊÇÔõô»ØÊ£¿ÈçºÎ×èÖ¹Ëü£¿
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loggingÖÐlogÊÇ¿ÉÒÔ·Ö¼¶µÄ£¬ËüµÄ¼¶±ðÓëÄãʹÓÃgetLogger()ÖеÄÃû×ÖÓйØϵ¡£±ÈÈ磬Äã¿ÉÒÔʹÓÃ"uliweb"»ò"uliweb.app"£¬ËüÃǵÄÇø±ð¾ÍÊÇ"uliweb.app"ÖÐÓÐÒ»¸ö'.'¡£ÄÇôlogging»á×Ô¶¯Éú³É"uliweb"ºÍ"uliweb.app"µÄlogger£¬²¢ÇÒ"uliweb"½«ÊÇ"uliweb.app"µÄloggerµÄ¸¸¶ÔÏó¡£ÕâÒ»µã¿ÉÒÔÕâÑùÑéÖ¤£º
>>> import logging
>>> log = logging.getLogger('uliweb.app')
>>> log.manager.loggerDict.items()
[('uliweb.app', <logging.Logger instance at 0x017CE238>), ('uliweb', <logging.PlaceHolder instance at 0x017CE2D8>)]
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>>> log.parent
<logging.RootLogger instance at 0x017E3AD0>
>>> log1 = logging.getLogger('uliweb')
>>> log.parent
<logging.Logger instance at 0x01820DA0>
>>> log.parent.name
'uliweb'
ͦÓÐÒâ˼¡£µ±ÎÒÃÇÖ±½Óͨ¹ýgetLogger('uliweb.app')»ñµÃÈÕÖ¾¶ÔÏóʱ£¬ËüµÄparent²¢²»ÊÇռλ¶ÔÏó'uliweb'£¬¶øÊÇRootLogger¡£Õâ¸öRootLoggerÊÇÔÚµ¼Èëloggingʱ×Ô¶¯ÓÉÄ£¿é´´½¨µÄ£¬ËüµÄ´´½¨´úÂëÊÇ£º
root = RootLogger(WARNING)
Logger.root = root
Logger.manager = Manager(Logger.root)
LoggerÊÇÕæÕýµÄloggerµÄÀà¡£¿ÉÒÔ¿´ËüÔÚÔËÐÐʱ»á¸øËü¸³ÓèrootºÍmanager¶ÔÏ󡣶ømanager¾ÍÊÇÓÃÀ´´´½¨logger²¢½øÐйÜÀíµÄÀࡣǰÃæµÄ´úÂë¾ÍÊÇͨ¹ý²é¿´manager.loggerDictÀ´²é¿´ËùÓÐÒѾ¶¨ÒåµÄlogger¡£
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root¶ÔÏóÓÐʲôÓÃÄØ£¿Ëü¾ÍÊÇȱʡµÄÈÕÖ¾¶ÔÏó¡£Ê¹ÓÃloggingµÄ×î¼òµ¥µÄ·½·¨ÊÇ£º
import logging
logging.info()
¿ÉÒÔÖ±½ÓÊä³ö¡£ÕâÀïÓÐʲôÃØÃÜ£¿¿´Ò»¿´´úÂëÒ»ÇоͶ¼Çå³þÁË¡£
def info(msg, *args, **kwargs):
"""
Log a message with severity 'INFO' on the root logger.
"""
if len(root.handlers) == 0:
basicConfig()
root.info(*((msg,)+args), **kwargs)
ÕâÀïÏȶÔrootµÄhandlers½øÐÐÅжϡ£ÄÇôhandlersÊÇʲô¶«Î÷£¿Ëü¾ÍÊÇÓÃÀ´´¦ÀíÿÌõÈÕÖ¾µÄ´¦ÀíÀàµÄʵÀý¡£Ã¿¸ölogger¿ÉÒÔÓв»Ö¹Ò»¸öhandlerʵÀý¡£²¢ÇÒÿ¸öhandler¶ÔÏó¿ÉÒÔÓÐ×ÔÒѵÄÈÕÖ¾Êä³ö¼¶±ð£¬¿ÉÒÔºÍloggerµÄ²»Í¬¡£handlerµÄ´¦ÀíÎÒÃǺóÃæÔÙ˵¡£ÉÏÃæµÄ´úÂëÒâ˼¾ÍÊÇ£¬Èç¹ûroot»¹Ã»Óж¨Òå´¦Àí¶ÔÏó£¬ÔòÖ´ÐÐbasicConfig()½øÐÐȱʡÅäÖá£È»ºóʹÓÃroot.info()½øÐÐÊä³ö¡£ËùÒÔÎÒÃÇ¿ÉÒÔÀí½â£ºlogging.info()Æäʵ¾ÍÊÇʹÓÃrootÀ´½øÐÐÊä³öµÄ£¬Äã¿ÉÒÔÀí½âËüÊÇÒ»¸öÈ«¾ÖÐԵģ¬È±Ê¡µÄÈÕÖ¾¶ÔÏó¡£²¢ÇÒ¿ÉÒÔ×Ô¶¯½øÐÐÅäÖá£
ÄÇô£¬ÎªÊ²Ã´ÒªÅäÖã¿ÒòΪRootLogger(WARNING)Ö»ÊÇ´´½¨ÁËloggerÀ࣬µ«ÊÇ»¹Ã»ÓÐÌí¼ÓÈκεÄhandler£¬Òò´ËhandlersÊǿյġ£Ò²¾ÍÊÇ˵£¬´´½¨ÁËÒ»¸ölogger£¬²¢²»±íʾËü¾Í¿ÉÒÔÊä³öÈÕÖ¾¡£ÊDz»ÊÇÓÐЩÆæ¹Ö£¿»¹ÊÇÒÔ´úÂëΪÉÏ£º
def callHandlers(self, record):
c = self
found = 0
while c:
for hdlr in c.handlers:
found = found + 1
if record.levelno >= hdlr.level:
hdlr.handle(record)
if not c.propagate:
c = None #break out
else:
c = c.parent
if (found == 0) and raiseExceptions and not self.manager.emittedNoHandlerWarning:
sys.stderr.write("No handlers could be found for logger"
" \"%s\"\n" % self.name)
self.manager.emittedNoHandlerWarning = 1
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