日志错位读写的问题

在对象销毁的时候需要记得销毁句柄：

class NgLogger:
    def __init__(self, module, file_name):
        self.logger = logging.getLogger(module)
        self.logger.setLevel(logging.DEBUG)
        self._fh = logging.FileHandler(file_name)
        self._fh.setLevel(logging.DEBUG)
        # create console handler with a higher log level
        self._ch = logging.StreamHandler()
        self._ch.setLevel(logging.DEBUG)
        # create formatter and add it to the handlers
        formatter = logging.Formatter('%(levelname)s %(asctime)s [%(filename)s:%(lineno)d] %(message)s')
        self._fh.setFormatter(formatter)
        self._ch.setFormatter(formatter)
        # add the handlers to the logger
        self.logger.addHandler(self._fh)
        self.logger.addHandler(self._ch)

    def __del__(self):
        self.logger.info('write log finished')
        self.logger.removeHandler(self._fh)
        self.logger.removeHandler(self._ch)

不确认对象是否销毁可以del 对象