Python 练习实例100例—4

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题目：输入某年某月某日，判断这一天是这一年的第几天？

程序分析：以3月5日为例，应该先把前两个月的加起来，然后再加上5天即本年的第几天，特殊 情况，闰年且输入月份大于3时需考虑多加一天：

程序源代码：

#!/usr/bin/python 
# -*- coding: UTF-8 -*- 
year = int(raw_input('year:\n')) 
month = int(raw_input('month:\n')) 
day = int(raw_input('day:\n')) 
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 

以上实例输出结果为：

year: 2015 month: 6 day: 7 it is the 158th day