What a wonderful world ! Love67

import sys, os
import urllib.request, re

url = "http://www.360kb.com/kb/2_122.html"

html_content = urllib.request.urlopen(url).read()

frase = r'#base services.*2015 end'
ip = re.search(frase, str(html_content)).group()
ip = ip.replace(" ", ' ')
ip = ip.replace("<br />", '')

f = open('C:\Windows\System32\drivers\etc\hosts', 'w')
f.write('')
f.close()
for t in ip.split('\\n')[:-10]:
    f = open('C:\Windows\System32\drivers\etc\hosts', 'a+')
    f.write(t + '\n')
    f.close()


f = open('C:\Windows\System32\drivers\etc\hosts', 'r')
    print(f.read())

import itertools

formatList = ["((%f%s%f)%s%f)%s%f", "(%f%s%f)%s(%f%s%f)", 
                "(%f%s(%f%s%f))%s%f", "%f%s(%f%s%f%s%f)",
                "%f%s(%f%s(%f%s%f))"]

opList = itertools.product(['+', '-', '*', '/'], repeat = 3)
def match24(fmt, nums, ops):
    a, b, c, d = nums
    op1, op2, op3 = ops
    expr = fmt % (a, op1, b, op2, c, op3, d)
    try:
        res = eval(expr)
    except ZeroDivisionError:
        return 
    if abs(res - 24) < 0.0001:
        print expr, "= 24"
def calc(numlist):
    for op in opList:
        for fmt in formatList:
            match24(fmt, numlist, op)
if __name__ == '__main__':
    nums = raw_input("please input four numbers:\n")
    seq = [float(i) for i in nums.split(' ')]
    for l in itertools.permutations(seq):
        calc(l)