1.计算闰年：

def runnian(i):if((i%4==0 and i%100!=0) or i%400==0):return Trueelse:return Falsei = int(raw_input ('year: \n'))print runnian(i)

2.质数:

#!/usr/bin/python

-- coding: UTF-8 --

num=[];

i=2for i in range(2,100):j=2for j in range(2,i):if(i%j==0):breakelse:num.append(i)print(num)

读写文件：

#--coding:utf-8f=open('a.txt','w+')f.write("hello\n")a=f.tell()print af=open('a.txt','a')f.close

f=open('a.txt','a+')

#f.seek(0)b=f.read(4)print b

f.close