def _parse_raw_lesson(raw_lesson):
    """

    Args:
        raw_lesson: 'BeautifulSoup' objects contains lesson info
    Returns:
        dict: info about lesson
        {
            'number': str,
            'time_bounds': str,
            'info': str
        }
    """
    info = raw_lesson.find_all('td')
    lesson_number = info[0].get_text()
    time_bounds = "".join(str(item) for item in info[1].contents)\
        .replace('<br/>', ' - ')
    lesson_info = info[2].get_text()

    return {
            'number': lesson_number,
            'time_bounds': time_bounds,
            'info': lesson_info
    }