输入某年某月某日，判断这一天是这一年的第几天？(可以用 Python 标准 库)

import datetime


def dayofyear():
    year = int(input("请输入年份："))
    month = int(input("请输入月份："))
    day = int(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(dayofyear())