python3中输入某年某月某日输出某年第几天(几时几刻)

方法1:

year = int(input("请输入年:"))
mouth = int(input("请输入月:"))
day = int(input("请输入日:"))
mouth_day = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
if year % 400 == 0 or (year % 100 != 0 and year % 4 == 0):
mouth_day[1] = 29
print(sum(mouth_day[:mouth-1])+day)

方法2:

from datetime import datetime
new_day = datetime(2017, 12, 31, 12, 36, 45)
start_day = datetime(2017, 1, 1)

print(new_day - start_day)

输出的结果天数人为地再加1,还可以输出几时几刻