views.py

from django.contrib.auth import (
  authenticate, get_backends, login, logout
)
#etc....

def userLogin(request):
    next_page = request.GET.get('next')

    if request.user.is_authenticated():
        if not next_page == None:
            return HttpResponseRedirect(next_page)
        else:
            return redirect('homepage')

    elif request.method == 'POST':
        username    = request.POST['username']
        password    = request.POST['password']

        """
        # Setup remember me
        # Refference: http://stackoverflow.com/a/32222658/3445802
        try:
            remember = request.POST['remember_me']
            if remember:
                settings.SESSION_EXPIRE_AT_BROWSER_CLOSE = False
        except MultiValueDictKeyError:
            is_private = False
            settings.SESSION_EXPIRE_AT_BROWSER_CLOSE = True

        # Customizing auth backend: http://django.zone/blog/posts/custom-authentication-backends-django/
        get_backends()
        """
        
        user = authenticate(username=username, password=password)
        if user is not None and user.is_active:
            login(request, user)
            
            if not next_page == None:
                return HttpResponseRedirect(next_page)
            else:
                return redirect('homepage')
        else:
            error_message = "Upps, Username and Password didn't match!"
            return render(request, 'myapp/login.html', {'error_message': error_message})
    else:
        return render(request, 'myapp/login.html')