python从显示ip地址的网站获取本机外网ip

python从显示ip地址的网站获取本机外网ip，这段python代码抓取网站上的ip地址信息

import urllib
import re
 
print "we will try to open this url, in order to get IP Address"
 
url = "http://checkip.dyndns.org"
 
print url
 
request = urllib.urlopen(url).read()
 
theIP = re.findall(r"\d{1,3}\.\d{1,3}\.\d{1,3}.\d{1,3}", request)
 
print "your IP Address is: ",  theIP