Python 实现输入某年某月某日，判断这一天是这一年的第几天？

import datetime
def get_daynum():
    year = input("请输入年份：")
    month = input("请输入月份：")
    day = input("请输入天：")
    date1 = datetime.date(year=int(year),month=int(month),day=int(day))
    date2 = datetime.date(year=int(year),month=1,day=1)
    return ((date1 - date2).days + 1)
if __name__ == '__main__':
    print(get_daynum())