python提取页面内的url列表

from bs4 import BeautifulSoup 
import time,re,urllib2 
  
t=time.time() 
  
websiteurls={} 
  
def scanpage(url): 
      
    websiteurl=url 
    t=time.time() 
    n=0 
    html=urllib2.urlopen(websiteurl).read() 
    soup=BeautifulSoup(html) 
    pageurls=[] 
    Upageurls={} 
    pageurls=soup.find_all("a",href=True) 
  
    for links in pageurls: 
        if websiteurl in links.get("href") and links.get("href") not in Upageurls and links.get("href") not in websiteurls: 
            Upageurls[links.get("href")]=0 
    for links in Upageurls.keys(): 
        try: 
            urllib2.urlopen(links).getcode() 
        except: 
            print "connect failed" 
        else: 
            t2=time.time() 
            Upageurls[links]=urllib2.urlopen(links).getcode() 
            print n, 
            print links, 
            print Upageurls[links] 
            t1=time.time() 
            print t1-t2 
        n+=1 
    print ("total is "+repr(n)+" links") 
    print time.time()-t 
  
  
scanpage("http://news.163.com/")