Python 練習實例4
Python 100例題目：輸入某年某月某日，判斷這一天是這一年的第幾天？
程式分析：以3月5日為例，應該先把前兩個月的加起來，然後再加上5天即本年的第幾天，特殊情況，閏年且輸入月份大於2時需考慮多加一天：
程式源代碼：
實例(Python 2.0+)
#!/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
以上實例輸出結果為：
year: 2015 month: 6 day: 7 it is the 158th day.