如何为不同的python日志处理程序设置不同的级别 [英] How to set different levels for different python log handlers

问题描述

我已经阅读了一些关于此的文章，但我仍然感到困惑.我有此日志记录设置:

I've read a few posts on this but I'm still confused. I have this logging setup:

import logging

class MongoHandler(logging.Handler):
    def __init__(self):
        logging.Handler.__init__(self)
        from pymongo import Connection
        self.db = Connection('db_server').db_name

    def emit(self, record):
        try:
            self.db.Logging.save(record.__dict__)
        except:
            print 'Logging Error:  Unable to save log entry to db'

mh = MongoHandler()
sh = logging.StreamHandler()
formatter = logging.Formatter('%(asctime)s - %(threadName)s - %(levelname)s - %(message)s')
sh.setFormatter(formatter)
log = logging.getLogger('DeviceMonitor_%s' % hostname)
log.addHandler(mh)
log.addHandler(sh)
log.setLevel(logging.INFO)

我希望能够为StreamHandler和MongoHandler设置不同的级别.有可能吗?还是我需要第二个Logger obj?

I want to be able to set a different level for the StreamHandler and the MongoHandler. Is that possible or do I need to have a second Logger obj?

推荐答案

您可以为每个日志记录处理程序设置不同的日志记录级别，但是似乎您必须将记录器的级别设置为最低".在下面的示例中，我将记录器设置为DEBUG，将流处理程序设置为INFO，并将TimedRotatingFileHandler设置为DEBUG.因此，该文件具有DEBUG条目，并且流仅输出INFO.您不能仅将DEBUG定向到一个处理程序，而只能将INFO定向到另一个处理程序.为此，您将需要另一个记录器.

You can set a different logging level for each logging handler but it seems you will have to set the logger's level to the "lowest". In the example below I set the logger to DEBUG, the stream handler to INFO and the TimedRotatingFileHandler to DEBUG. So the file has DEBUG entries and the stream outputs only INFO. You can't direct only DEBUG to one and only INFO to another handler. For that you'll need another logger.

logger = logging.getLogger("mylog")
formatter = logging.Formatter(
    '%(asctime)s | %(name)s |  %(levelname)s: %(message)s')
logger.setLevel(logging.DEBUG)

stream_handler = logging.StreamHandler()
stream_handler.setLevel(logging.INFO)
stream_handler.setFormatter(formatter)

logFilePath = "my.log"
file_handler = logging.handlers.TimedRotatingFileHandler(
    filename=logFilePath, when='midnight', backupCount=30)
file_handler.setFormatter(formatter)
file_handler.setLevel(logging.DEBUG)

logger.addHandler(file_handler)
logger.addHandler(stream_handler)

logger.info("Started");
try:
    x = 14
    y = 0
    z = x / y
except Exception as ex:
    logger.error("Operation failed.")
    logger.debug(
        "Encountered {0} when trying to perform calculation.".format(ex))

logger.info("Ended");

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