Usually, I write INFO log to file and warn to stdout. Since those option is exclusive in basicConfig function, need to create two handler separately.

python_log.py

def setup_logger(log_file):
    log_format = '[%(asctime)s][%(process)5d][%(levelname)s][%(filename)s L%(lineno)d]%(message)s'
    # write to file
    file_handler = logging.FileHandler(log_file, 'w')
    file_handler.setLevel(logging.INFO)
    # stream to stdout
    stdout_handler = logging.StreamHandler(sys.stdout)
    stdout_handler.setLevel(logging.WARN)
    stdout_handler.setFormatter(logging.Formatter(fmt=log_format))
    logging.basicConfig(level=logging.INFO, format=log_format, handlers=[file_handler, stdout_handler])

if __name__ == '__main__':
    config = load_config()
    setup_logger(config['log'])
    logger = logging.getLogger('main')