python实例之判断闰年

#!/usr/bin/python
#-*- coding:utf-8 -*- 
try: 
  year = int(raw_input('请输入年份(如2008): ')) 
except: 
  print '请输入正确的年份' 
  exit() 
 
is_leap = False 
if year % 100 == 0 and year % 400 == 0: 
  is_leap = True 
elif year % 100 != 0 and year % 4 == 0: 
  is_leap = True 
 
if is_leap: 
  print '%d年是闰年！' % year 
else: 
  print '%d年不是闰年！' % year