def week_to_date(term_begin_time, week, weekday):
    """
    根据学期开始时间,周次,星期几计算日期
    """
    time = convert_string_to_datetime(term_begin_time)
    date = time + timedelta((int(week) - 1) * 7 + int(weekday))
    return date.date()
def week_to_date(term_begin_time, week, weekday):
    time = convert_string_to_datetime(term_begin_time)
    date = time + timedelta((int(week) - 1) * 7 + int(weekday) - 1)
    return date