def login(request):
  errors = False
  if request.method == 'POST':
    username = request.POST.get('username', '')
    password = request.POST.get('password', '')
    user = auth.authenticate(username=username, password=password)
    if user is not None and user.is_active:
      # Correct password, and the user is marked "active"
      auth.login(request, user)
      # Redirect to a success page.
      return HttpResponseRedirect("/study/")
    else:
      errors = True
      return render_to_response("registration/login.html", locals())
  else:
    return render_to_response("registration/login.html", locals())