How to configure logging with colour, format etc in separate setting file in python?

I am trying to call python script from bash script. (Note: I am using python version 3.7) Following is the Directory structure (so_test is a directory)

so_test
  shell_script_to_call_py.sh
  main_file.py
  log_settings.py

files are as below,

shell_script_to_call_py.sh

#!/bin/bash

echo "...Enable Debug..."
python $(cd $(dirname ${BASH_SOURCE[0]}) && pwd)/main_file.py "input_1" --debug

echo "...No Debug..."
python $(cd $(dirname ${BASH_SOURCE[0]}) && pwd)/main_file.py "input_2"

main_file.py

import argparse
import importlib

importlib.import_module("log_settings.py")
from so_test import log_settings


def func1():
    log.info("INFO Test")
    log.debug("DEBUG Test")
    log.warning("WARN Test")


def func2():
    log.info("INFO Test")
    log.debug("DEBUG Test")
    log.warning("WARN Test")


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("input", type=str, help="input argument 1 is missing")
    parser.add_argument("--debug", help="to print debug logs", action="store_true")
    args = parser.parse_args()
    log_settings.log_conf(args.debug)
    log.info("INFO Test")
    log.debug("DEBUG Test")
    log.warning("WARN Test")
    func1()
    func2()


if __name__ == "__main__":
    main()

log_settings.py

import logging
from colorlog import ColoredFormatter


def log_config(is_debug_level):
    log_format = "%(log_color)s %(levelname)s %(message)s"
    if is_debug_level:
        logging.root.setLevel(logging.DEBUG)
    else:
        logging.root.setLevel(logging.INFO)
    stream = logging.StreamHandler()
    stream.setFormatter(ColoredFormatter(log_format))
    global log
    log = logging.getLogger('pythonConfig')
    log.addHandler(stream)

Following are 2 issues I am facing. (as a newbie to python)

1. I am not able to import the log_settings.py properly in main_file.py
2. I want to access use log.debug, log.info etc. in main_file (and other .py file) across different functions, for which the settings (format, color etc.) is declared in log_settings.py file.