Logging formatter guessing automagically from where the log call was made

magic_log.py

import inspect
import logging


class MagicFormatter(logging.Formatter):
    def format(self, record):
        # extract frame from which the logging call was made
        caller_frame = inspect.stack()[8]
        # extract name of module from frame
        record.name = inspect.getmodule(caller_frame[0]).__name__
        # extract name of function from frame (if call wasn't made from module's top level)
        func_name = caller_frame[3]
        if func_name != '<module>':
            record.name += ('.' + func_name)
        return super(MagicFormatter, self).format(record)


def logger_init():
    # logging
    logger = logging.getLogger()
    logger.setLevel(config.loglevel)
    formatter = MagicFormatter('%(levelname)s [%(name)s] %(asctime)s - %(message)s')

    # log to stdout/stderr
    stream_handler = logging.StreamHandler()
    stream_handler.setLevel(config.loglevel)
    stream_handler.setFormatter(formatter)
    logger.addHandler(stream_handler)

    return logger