python logging: disable messages from specific imported function

Question

I know how to suppress log messages up to a certain log level from an imported module:

import logging
logging.getLogger("module_name").setLevel(logging.WARNING)

I want to know if it's possible to suppress log messages from only a specific function/class in an imported module (and keep all other messages in the module).

I tried this:

logging.getLogger("module_name.function_name").setLevel(logging.WARNING)

but it didn't work. Is it possible?

Logging has a built in function that should help with this. docs.python.org/3/library/logging.html#logging.Logger.propagate — Glazbee
– Glazbee, Commented Oct 17, 2019 at 10:56
can you give an example? just to clarify, i cannot change the code inside the imported module. — Dan
– Dan, Commented Oct 17, 2019 at 11:03
I don't think this is possible for a single function. Usually, loggers are defined for an entire module (e.g. logger = logging.getLogger(__name__)) and the logger doesn't know who is calling it. — Neraste
– Neraste, Commented Oct 17, 2019 at 11:36
@Dan I apologise, it didn't have the expected result during testing. Have you considered using a decorator function? — Glazbee
– Glazbee, Commented Oct 17, 2019 at 11:53
@Dan did you find a solution or do you still need an answer here? If you do, please provide more information regarding your logging configuration. Do you use a dictConfig ? Do you just use it straight out of the box ? — Marius Mucenicu
– Marius Mucenicu, Commented Oct 22, 2019 at 6:05

Dan · Accepted Answer · 2019-10-22 09:48:08Z

1

I came up with this in the end based on logging with filters:

Contents of my_module.py:

import logging

logger = logging.getLogger(__name__)


def func1():
    logger.debug('Running func1!')


def func2():
    logger.debug('Running func2!')

I want to ignore any messages from func2, but keep any messages from func1.

Contents of main.py:

import logging

import my_module

logging.basicConfig(level=logging.DEBUG)


class IgnoreFunc2(logging.Filter):
    def filter(self, record):
        return not record.funcName == 'func2'


# this relies on knowing the variable name in my_module
my_module.logger.addFilter(IgnoreFunc2())


def main():
    my_module.func1()
    my_module.func2()


if __name__ == '__main__':
    main()

Output:

DEBUG:my_module:Running func1!

answered Oct 22, 2019 at 9:48

Dan

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