def get_title(cls, lang='ko'):
    """ cls에서 column의 title을 생성하는 함수 """
    title = []
    if cls['instant_datetime'] is None:
        start_date = cls['start_datetime'].strftime('%Y%m%d')
        end_date = cls['end_datetime'].strftime('%Y%m%d')
        title.append('{}-{}'.format(start_date, end_date))
    else:
        instant_date = cls['instant_datetime'].strftime('%Y%m%d')
        title.append('{}'.format(instant_date))
    qlist = []
    for qname in cls['label']:
        qlist.append(cls['label'][qname][lang].strip())
    title.append(tuple(qlist))
    return tuple(title)
