logging with filters

Question

I\'m using Logging (import logging) to log messages.

Within 1 single module, I am logging messages at the debug level my_logger.debug(\'msg\')

Answer 1

Do not use global. It's an accident waiting to happen.

You can give your loggers any "."-separated names that are meaningful to you.

You can control them as a hierarchy. If you have loggers named a.b.c and a.b.d, you can check the logging level for a.b and alter both loggers.

You can have any number of loggers -- they're inexpensive.

The most common design pattern is one logger per module. See Naming Python loggers

Do this.

import logging

logger= logging.getLogger( "module_name" )
logger_a = logger.getLogger( "module_name.function_a" )
logger_b = logger.getLogger( "module_name.function_b" )

def function_a( ... ):
    logger_a.debug( "a message" )

def function_b( ... ):
    logger_b.debug( "another message" )

if __name__ == "__main__":
    logging.basicConfig( stream=sys.stderr, level=logging.DEBUG )
    logger_a.setLevel( logging.DEBUG )
    logger_b.setLevel( logging.WARN )

    ... etc ...