输入日期判断是不是周末，是周末就返回最近的下周一日期，不是就返回输入日期

def work_day(date):
  if date.isoweekday() == 6:
    return date + timedelta(days=2)
  elif date.isoweekday() == 7:
    return date + timedelta(days=1)
  else:
    return date

work_day(datetime.date(2020, 2, 1))