Question

您好我正在尝试在python上启用日志，并且由于某种原因没有记录任何内容。有人可以帮我解决我犯的错误。

def setup():
    logger = logging.getLogger('mytest')
    formatter = logging.Formatter('%(asctime)s %(message)s')

    fileHandler = logging.FileHandler('mylog.log')
    fileHandler.setLevel(logging.DEBUG)
    fileHandler.setFormatter(formatter)

    logger.addHandler(fileHandler)
    logger.debug('hello world')

Answer 1

以下示例将使其更加清晰。您需要设置的主要级别是logger对象。您可以通过调用getEffectiveLevel方法检查logger级别。

def setup():
    logger = logging.getLogger('mytest')
    formatter = logging.Formatter('%(asctime)s %(message)s')
    fileHandler = logging.FileHandler('mylog.log')
    fileHandler.setLevel(logging.DEBUG)
    fileHandler.setFormatter(formatter)
    logger.addHandler(fileHandler)

    logger.critical("before setting Level on logger, effective level = {}".format(
            logger.getEffectiveLevel()))


    #THIS WON'T BE logged becuse logger level is WARN
    # and DEBUG < WARN
    logger.debug('logging debug before setting debug level')

    logger.setLevel(logging.DEBUG)

    logger.critical("after setting Level on logger, effective level = {}".format(
            logger.getEffectiveLevel()))


    #THIS WILL BE logged in mylog.log because DEBUG >= DEBUG
    logger.debug('logging debug after setting debug level')

    fileHandler.setLevel(logging.CRITICAL)


    #THIS WON'T BE logged in mylog.log because fileHandler level is CRITICAL--->
    # and DEBUG < CRITICAL
    logger.debug("this won't be printed in mylog.log")


    #THIS WILL BE logged in mylog.log BECAUSE CRITICAL >= CRITICAL--->
    logger.critical("logging at critical level")

Python日志记录自定义处理程序和格式化程序没有记录

1 个答案: