logging usage

logging_sample.py

def init_logger():
    logger = logging.getLogger()
    hdr = logging.FileHandler('xiami.log.txt')
    formatter = logging.Formatter('%(asctime)s    %(levelname)s    %(message)s')
    hdr.setFormatter(formatter)
    logger.addHandler(hdr)
    logger.setLevel(logging.NOTSET)
    return logger

# useage #
logger = init_logger()
logger.error('xxx')
logger.info('ooo')