from django.contrib.auth import authenticate
from django.contrib.auth.models import User
from models import Listing # your Listing model

def register_view(request):
    username = request.POST['username']
    email = request.POST['email']
    password = request.POST['password']
    user = User.objects.create_user(username, email, passsword)
    user.save()

def login_view(request):
    username = request.POST['username']
    password = request.POST['pasword']
    user = authenticate(username=username, password=password)
    if user is not None:
        login(request, user)
        # redirect to success
    else:
        # invalid login

def submit_listing(request):
    if request.user.is_authenticated:
        # redirect away to login
    else:
        # access Django's user model from request object
        username = request.user.username
        name = request.POST['name']
        price = request.POST['price']
        listing = Listing(username=username, name=name, price=price)
        listing.save()