Set up logger

def init_logging(settings):
    '''Set up logger'''
    lg_format = '%(asctime)s : - %(message)s'
    lg_dateformat = '%Y.%m.%d %H:%M:%S'
    logging.basicConfig(format=lg_format, datefmt=lg_dateformat)

    log = get_logger()

    handler = logging.handlers.WatchedFileHandler(
                            filename=settings['log_file'] \
                            if 'log_file' in settings.keys() else None,
                            encoding='utf-8')
    formatter = logging.Formatter(fmt=lg_format, datefmt=lg_dateformat)
    handler.setFormatter(formatter)
    log.addHandler(handler)
    return log