How to specify levels in python logging module?

user_10061193 0
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I need two handlers. One for file logging and another one for stream logging in the console. I need to specify levels for each handler. Notice that my levels are going to be something like the following ones.

Stream Handler --> INFO

File Handler --> WARNING, ERROR, CRITICAL

Here is my code.

    # Create a custom logger
    logger = logging.getLogger('DBMQ')
    logger.setLevel(logging.DEBUG)

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

    logger.addHandler(stream_handler)

    file_handler = logging.FileHandler('./data/file.log')
    file_handler.setLevel(logging.WARNING)

    logger.addHandler(file_handler)

Now, it has to operate like this:

logger.debug('hey') # Nothing should happen
logger.info('hey') # only stream handler should log this message
logger.warning('hey') # only file handler should log this message but the stream does too
logger.error('hey') # only file handler should log this message but the stream does too
logger.critical('hey') # only file handler should log this message but the stream does too

I need to disallow the stream handler from logging the warning, error, and critical logging levels. Is there any way to filter this handler?

structlog logging python
2 Answers

You could create your own Handler:

logger = logging.getLogger('DBMQ')
logger.setLevel(logging.DEBUG)


class MyStreamHandler(logging.StreamHandler):
    def emit(self, record):
        if record.levelno == self.level:
            super().emit(record)

stream_handler = MyStreamHandler()
stream_handler.setLevel(logging.INFO)

logger.addHandler(stream_handler)

file_handler = logging.FileHandler('./data/file.log')
file_handler.setLevel(logging.WARNING)

logger.addHandler(file_handler)
user_12179450

The "level" system does not work to as disable/enable single "levels". https://docs.python.org/3/library/logging.html#logging-levels

The "level" is a single integer value. If the message's level is over logger/handler level, it will be showed. Just that simple.

If you need another logic the only way is implement you own handlers.

user_4745160
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