段子有我更精彩
#!/usr/bin/env python
while True:
year=raw_input('please input a year: ')
a= int(year)
if a%4==0 and a%100!=0:
print year, 'is runnian'
elif a%400==0:
print year ,'is runnian'
else:
print year ,'is not runnian'
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