Python function to test if a file at a URL exists.

gistfile1.py

import urllib2

def file_exists(location):
    request = urllib2.Request(location)
    request.get_method = lambda : 'HEAD'
    try:
        response = urllib2.urlopen(request)
        return True
    except urllib2.HTTPError:
        return False

Hello ,
i wanna fetch file in server with authentication,i try this :

values = {"username": "user", "password": "password"} try: r = urllib.request.urlopen(url, values) # response return r.getcode() == 200 except urllib.request.HTTPError: return False

but thasnt work, can u help me please