Python记录多个文件

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我有一个Python日志模块的问题,我不确定我是否在这里做了一些愚蠢的事情,但我有两个Python脚本,一个(master.py)调用另一个(slave.py).它们都记录到单独的日志文件,但被调用的第二个脚本(slave.py)似乎递归地记录！

谁能看到我在这里做错了什么？

这是我的代码：

# master.py

import sys
import logging
import slave

masterLog = logging.getLogger('master')
masterLog.setLevel(logging.DEBUG)
masterHandler = logging.FileHandler('master.log')
formatter = logging.Formatter('%(levelname)s: %(asctime)s %(funcName)s(%(lineno)d) -- %(message)s', datefmt = '%Y-%m-%d %H:%M:%S')
masterHandler.setFormatter(formatter)
masterLog.addHandler(masterHandler)
masterLog.info('This is masterLog running on master.py')
print 'master.py has: ', len(masterLog.handlers), 'handlers'

for i in range(1,6):
      masterLog.info('Running slave %s' % i)
      slave.runMain()

# slave.py

import sys
import logging

def runMain():
    slaveLog = logging.getLogger('slave')
    slaveLog.setLevel(logging.DEBUG)
    slaveHandler = logging.FileHandler('slave.log')
    formatter = logging.Formatter('%(levelname)s: %(asctime)s %(funcName)s(%(lineno)d) -- %(message)s', datefmt = '%Y-%m-%d %H:%M:%S')
    slaveHandler.setFormatter(formatter)
    slaveLog.addHandler(slaveHandler)
    slaveLog.info('This is slaveLog running on slave.py')
    print 'slave.py has: ', len(slaveLog.handlers), 'handlers'

if __name__ == '__main__':
    runMain()

这是输出：

master.py has:  1 handlers
slave.py has:  1 handlers
slave.py has:  2 handlers
slave.py has:  3 handlers
slave.py has:  4 handlers
slave.py has:  5 handlers

和master.log：

INFO: 2012-02-29 13:26:49 <module>(13) -- This is masterLog running on master.py
INFO: 2012-02-29 13:26:49 <module>(17) -- Running slave 1
INFO: 2012-02-29 13:26:49 <module>(17) -- Running slave 2
INFO: 2012-02-29 13:26:49 <module>(17) -- Running slave 3
INFO: 2012-02-29 13:26:49 <module>(17) -- Running slave 4
INFO: 2012-02-29 13:26:49 <module>(17) -- Running slave 5

而slave.log：

INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py
INFO: 2012-02-29 13:26:49 runMain(13) -- This is slaveLog running on slave.py

slave脚本似乎每次调用时都会添加一个新文件Handler. slave.log文件中应该只有5个条目,但每次调用slave.py时,logger输出到每个文件处理程序！

谢谢,
JAK

解决方法:

logging.getLogger([name])总是返回相同的对象(全局对象),每次调用runMain时都会在其上调用addHandler.

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