根据URL地址获取域名

#coding:utf-8
import urllib
#根据URL获取域名
def getdomain(url):
    proto, rest = urllib.splittype(url)
    host, rest = urllib.splithost(rest)
    return host

print getdomain("http://www.cnblogs.com/goodhacker/admin/EditPosts.aspx?opt=1")

输出结果为：www.cnblogs.com