Python to achieve web link extraction method sharing

#encoding:utf-8
import socket
import htmllib,formatter
def open_socket(host,servname):
    s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    port=socket.getservbyname(servname)
    s.connect((host,port))
    return s
host=''
host=input(' Please enter the website n')
mysocket=open_socket(host,'http')
message='GET http://%s/nn'%(host,)
mysocket.send(message)
file=mysocket.makefile()
htmldata=file.read()
file.close()
parser=htmllib.HTMLParser(formatter.NullFormatter())  
parser.feed(htmldata)
print 'n'.join(parser.anchorlist)
parser.close()