url_to_check = 'http://clientdownload.xyz.com/Documents/abc.zip'
    username = "user"
    password = "pwd"
    p = urllib2.HTTPPasswordMgrWithDefaultRealm()
    p.add_password(None, url_to_check, username, password)
    handler = urllib2.HTTPBasicAuthHandler(p)
    opener = urllib2.build_opener(handler)
    urllib2.install_opener(opener)
    zip_file = urllib2.urlopen(url_to_check).read()
    file_name = 'somefile.zip'
    meta = zip_file.info()
    file_size = int(meta.getheaders("Content-Length")[0])
    print "Downloading: %s Bytes: %s" % (file_name, file_size)

    with open(file_name, 'wb') as dwn_file:
        dwn_file.write(zip_file.read())

import urllib2, re, time, sys

theurl='http://clientdownload.xxx.com/Documents/Forms/AllItems.aspx'

req = urllib2.Request(theurl)

try:
    handle = urllib2.urlopen(req)

except IOError, e:

    if hasattr(e, 'code'):

        if e.code != 401:
            print 'We got another error'
            print e.code
        else:
            print e.headers
            print e.headers['www-authenticate']

Content-Type: text/html; charset=utf-8
Server: Microsoft-IIS/7.5
SPRequestGuid: 939bad00-40b7-49b9-bbbc-99d0267a1004
X-SharePointHealthScore: 0
WWW-Authenticate: NTLM
X-Powered-By: ASP.NET
MicrosoftSharePointTeamServices: 14.0.0.6029
Date: Wed, 12 Feb 2014 13:14:19 GMT
Connection: close
Content-Length: 16

import requests
from requests_ntlm import HttpNtlmAuth

r = requests.get("http://ntlm_protected_site.com",auth=HttpNtlmAuth('domain\username','password'))