python小程序

发布时间:2019-09-05 07:02:05编辑:auto阅读(1526)

    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

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