python 分析Google音乐下载地

# coding=utf-8    
import urllib,re,sys,time


url='http://www.google.cn/music/topiclisting?q=top100_duet_love_songs&cat=song'
prefix='http://www.google.cn/music/top100/musicdownload?id='
downname='songlist.txt'
html=urllib.urlopen(url).read()

regx='下载.*window.*http.*\\\\x26resnum'            #\x26resnum很奇怪，明明看到的是一个‘\’可是匹配不出来，好像是有两个‘\\’    
reobj=re.compile(regx)    
reg='http.*mp3'     #文件下载地址
rej=re.compile(reg)    
list=[]

for match in reobj.finditer(html):
        list.append(match.group())
        
id=[]

for l in list:
        id.append(prefix+urllib.unquote(l[-27:-10]))
        
down=[]

for i    in id:
        html=urllib.urlopen(i).read()
        time.sleep(1)
        for match in rej.finditer(html):
                down.append(urllib.unquote(urllib.unquote(match.group())))

                
if len(down) >0:
        file=open(downname,'w')
        for d in down:
                file.write(d+'\n')
        file.close()

print 'finish'