1246库函数解法（Python）

解题思路:

注意事项:太晚了，先睡了，想起来了再写吧

参考代码:

from datetime import datetime

import sys

for line in sys.stdin:

    line = line.strip('\n')

    if line == '':

        pass

    else:

        line = list(map(int,line.split('/')))

        judge_datetime = datetime(line[0], line[1], line[2])

        yearday = (judge_datetime - datetime(judge_datetime.year, 1, 1)).days + 1

        print(yearday)