如何在Python中的模块之间共享记录器实例？

import conf_store

def hello():
        print conf_store.logger
        conf_store.logger.debug('why')
        print 'where'

conf_store.py的模块：

#! /usr/bin/python 

import os,subprocess,logging,time,shutil,fcntl
import lib_xml

def log():
        """
        a log handle
        """
        import logging.handlers
        global logger
        LOG_PATH = "/opt/conf_store.log"
        logger = logging.getLogger('conf_store')
        logger.setLevel(logging.DEBUG)
        ch = logging.handlers.WatchedFileHandler(LOG_PATH)
        ch.setLevel(logging.DEBUG)
        formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
        ch.setFormatter(formatter)
        logger.addHandler(ch)



if __name__ == "__main__":
        log()

        while(True):
                lib_xml.hello()
                logger.debug('what')

如何在lib_xml.py和conf_store.py之间共享logger对象？