python小程序

1.计算闰年： def runnian(i): if((i%4==0 and i%100!=0) or i%400==0): return True else: return False i = int(raw_input ('year: \n')) print runnian(i)

2.质数: #!/usr/bin/python

-- coding: UTF-8 --

num=[]; i=2 for i in range(2,100): j=2 for j in range(2,i): if(i%j==0): break else: num.append(i) print(num)

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

f=open('a.txt','a+') #f.seek(0) b=f.read(4) print b

f.close