django 用户认证问题

def login_(request):)<br>
    username = request.POST.get('username', '')<br>
    password = request.POST.get('password', ''))<br>
    user = auth.authenticate(username=username, password=password)
    if user is not None and user.is_active:)<br>
        # Correct password, and the user is marked "active")<br>
        auth.login(request,user))<br>
        print user.is_authenticated)<br>
        print request.user)<br>
        # Redirect to a success page.)<br>
        return HttpResponseRedirect("/index/"))<br>
    else:)<br>
        # Show an error page)<br>
        return HttpResponseRedirect("/denglu/"))<br>

{% if request.user.is_authenticated %<br>
  <p>Welcome, {{ request.user.username }}. Thanks for logging in.</p><br>
{% else %}<br>
  <p>Welcome, new user. Please log in.</p><br>
{% endif %}<br>