http://chriskief.com/2012/12/22/django-register-with-oauth-twitter/

twitter.py

import tweepy
from django.conf import settings
from django.core.urlresolvers import reverse
from django.core.context_processors import csrf


def get_authorization_url(request):

        # URL to where we will redirect to
        redirect_url = settings.SITE_URL + reverse('register_twitter')

        # create the handler
        auth = tweepy.OAuthHandler(settings.TWITTER_CONSUMER_KEY, settings.TWITTER_CONSUMER_SECRET, redirect_url)

        # get the authorization url (i.e. https://api.twitter.com/oauth/authorize?oauth_token=XXXXXXX)
        # this method automatically grabs the request token first
        # Note: must ensure a callback URL (can be any URL) is defined for the application at dev.twitter.com,
        #       otherwise this will fail (401 Unauthorized)
        try:
            url = auth.get_authorization_url()
        except tweepy.TweepError:
            # failed to get auth url (maybe twitter is down)
            url = reverse('home')
            return url

        # store the returned values
        request.session['twitter_request_token_key'] = auth.request_token.key
        request.session['twitter_request_token_secret'] = auth.request_token.secret

        return url