helper.py

import logging

log = logging.getLogger(__name__)


def say_hello():
    log.info('Hello from helper module!')

main.py

import logging
import _logging.helper as helper


def create_logger():
    logger = logging.getLogger(__name__)
    logger.setLevel(logging.DEBUG)
    formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    stream_handler = logging.StreamHandler()
    stream_handler.setFormatter(formatter)
    file_handler = logging.FileHandler("logs/log.txt")
    file_handler.setFormatter(formatter)
    logger.addHandler(stream_handler)
    logger.addHandler(file_handler)
    return logger


def say_hello(log):
    log.debug('Hello from main module!')


if __name__ == '__main__':
    logger = create_logger()
    say_hello(logger)
    helper.say_hello()