python logging 模块 程序结束后并没有终止进程

环境：win7 + py3.5 + spyder

调用python logging模块定义一个自己的log类，发现在程序结束后，创建的log还会存在，下次运行时会输出两遍。程序如下：

import os, logging

class MyLogger(object): 
    def __init__(self, name, path='log'):
        log_path = str(os.getcwd()) + '\\' + str(name) + '_' + str(path) + '\\'
        self.error_lg = logging.getLogger('error')
        self.info_lg = logging.getLogger('info')
        if (not os.path.exists(log_path)):
            os.makedirs(log_path)
        formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')
        if (len(self.error_lg.handlers) == 0):  #确保只有1个handler
            error_h = logging.FileHandler(log_path + 'error.log')   
            error_h.setFormatter(formatter)      
            self.error_lg.addHandler(error_h)
        if (len(self.info_lg.handlers) == 0):
            info_h = logging.FileHandler(log_path + 'info.log')
            info_h.setFormatter(formatter)
            self.info_lg.addHandler(info_h)
    def info(self, msg):
        self.info_lg.info(msg)
    def error(self, msg):
        self.error_lg.error(msg)
    def release(self):
        logging.shutdown()    # flushing and closing any handlers (not removing them)
        
      

if __name__ == '__main__':
    t_log = MyLogger(name='test')
    t_log.error('error-5')
    t_log.info('info-5')
    t_log.release()

<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">每运行一次，文件中的error、info就会多一次，调用release()也没有用。在网上查资料，找到原因</span>

“The logging module uses a globally static logger object that persists across your session when you are in the interpreter. So every time you call add_handler you're adding a brand new stream handler but not removing the old one. Logging just iterates through its handlers and sends the output to each, so you have a new copy of the same thing going to the console every time you run.”

其中说到：“logging.shutdown(), it is just for flushing and closing any handlers (not removing them).”根据自己的测试情况，在程序结束后，logging仍然会存在，除非 restart python kernel，这样可能会导致内存溢出。

解决办法就是，在每次给logging添加handler之前，判断handlers的数目：

if (len(self.info_lg.handlers) == 0):

另外一个也遇到同样的问题，不过貌似没有提出更好的解决方法：http://stackoverflow.com/questions/24816456/python-logging-wont-shutdown