【demo 004】

题目：
输入某年某月某日，判断这一天是这一年的第几天

源代码：

string_date =input('like year-month-day:\n')
date_list=string_date.split('-')
print(date_list)
year=int(date_list[0])
month = int(date_list[1])
day = int(date_list[2])
months = (0,31,59,90,120,151,181,212,243,273,304,334)
if 0 <= month <= 12:
    sum = months[month - 1]
else:
    print('data error')
sum += day
leap = 0
if (year % 400 == 0) or ((year % 4 == 0) and (year % 100 != 0)):
    leap = 1
if (leap == 1) and (month > 2):
    sum += 1
print('it is the %dth day.' % sum)