def register(request, template_name="registration/register.html"):
if request.method == 'GET':
    return render_to_response(template_name, locals(),
        context_instance=RequestContext(request))
elif request.method == 'POST':
    f_name = request.POST['f_name']
    l_name = request.POST['l_name']
    phone = request.POST['phone']
    username = request.POST['username']
    email = request.POST['email']
    password = request.POST['password']
    re_password = request.POST['confirmation']
    """
        determining user type i.e buyer or seller and assigning them a integer value
    """
    if request.POST['type'] == 'buyer':
        u_type = 0
    else:
        u_type = 1

    if password == re_password:
        # call create_user from ORM,
        user = auth.models.User.objects.create_user(username,email,password)
        user.first_name = f_name
        user.last_name = l_name
        user.save()

        new_user = auth.authenticate(username=username, password=password)
        if new_user is not None:
            """adding users extra details"""
            u_details = User_Details.objects.get(user=new_user.id)
            u_details.u_type = u_type
            u_details.contact = phone
            u_details.save()
            if new_user.is_active:
                auth.login(request, new_user)
                return redirect('/catalog')
            else:
                warning = "User already exists or not active"
                return render_to_response(template_name, locals(),
                    context_instance=RequestContext(request))
        else:
            warning = "Enter correct details."
            return render_to_response(template_name, locals(),
                context_instance=RequestContext(request))
    else:
        warning = "Password does not matched"
        return render_to_response(template_name, locals(),
            context_instance=RequestContext(request))

from django.contrib.auth.models import User
from django.db import models

# Create your models here.
class User_Details(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    """
    User type:
        Buyer: 0
        Seller: 1
    """
    u_type = models.PositiveSmallIntegerField(default=0)
    sex = models.CharField(max_length=10, blank=True)
    address = models.TextField(default="no address")
    contact = models.BigIntegerField(default=1234567890)
    image = models.CharField(max_length=50, default="default.jpg")