python 使用logging多线程写多个log文件

why

import threading
import time
import logging
import logging.handlers

LEVELS={'notset':logging.DEBUG,
'debug':logging.DEBUG,
'info':logging.INFO,
'warning':logging.WARNING,
'error':logging.ERROR,
'critical':logging.CRITICAL}

LOG_FILENAME = 'test.log'
LOG_BACKUPCOUNT = 5
LOG_LEVEL = 'notset'

def InitLog(file_name,logger):
LOG_FILENAME = file_name

handler = logging.handlers.RotatingFileHandler(LOG_FILENAME,maxBytes=10*1024*1024,backupCount=LOG_BACKUPCOUNT)
#handler = logging.FileHandler(LOG_FILENAME)
formatter = logging.Formatter("[ %(asctime)s ][ %(levelname)s ] %(message)s\n")
handler.setFormatter(formatter)   
#logger = logging.getLogger()
logger.addHandler(handler)
logger.setLevel(LEVELS.get(LOG_LEVEL.lower()))
return logger

class t1(threading.Thread):
def __init__(self,threadName):
threading.Thread.__init__(self,name = threadName)

logger1 = logging.getLogger("thread.a")
self.logger = InitLog("thread1.log",logger1)

def run(self):
global i
self.logger.info("test1")
while True:
print '*************hello t1*****************'
self.logger.info("******hello t1******")
self.logger.debug("t1 debug")
self.logger.warning("t1 warning")
self.logger.error("t1 error")
i += 1
print i
if i> 10:
break
time.sleep(3)
self.logger.info("test1 over")

class t2(threading.Thread):
def __init__(self,threadName):

threading.Thread.__init__(self,name = threadName)

logger2 = logging.getLogger("thread.b")
self.logger = InitLog("thread2.log",logger2)

print "self.logger = %s" %self.logger
None
def run(self):
global i
self.logger.info("test2")
while True:
print 'hello t2'
self.logger.info("hello t2")
self.logger.debug("t2 debug")
self.logger.warning("t2 warning")
self.logger.error("t2 error")
i += 1
print i
if i > 10:
break
time.sleep(5)
self.logger.info("test2.over")
i = 0

p1 = t1('p1')
p1.start()
p2 = t2('p2')
p2.start()