python logging 备忘

常用format

log_formatter = logging.Formatter("%(asctime)s %(process)s %(thread)s %(filename)s [%(levelname)-5.5s] %(message)s")

常用handler

1. TimedRotatingFileHandler 按照日期切分日志

   如下:

   from logging.handlers import TimedRotatingFileHandler
   file_handler = TimedRotatingFileHandler('%smain.log' % log_path, when='midnight')
   file_handler.suffix = '%Y_%m_%d.log'
   file_handler.setFormatter(log_formatter)            
   

2. StreamHandler std输出

   如下:

    std_handler = logging.StreamHandler(sys.stdout)
    std_handler.setFormatter(log_formatter)
    

添加handler

logger = logging.getLogger()
logger.addHandler(file_handler)
logger.addHandler(std_handler)
logger.setLevel(logging.WARNING)

終わり。