Best way to code multiple decisions in Python

I have the following practical problem (related to Django/Python).

I'm trying to get the following in the most efficient piece of Python code ->

There are 2 items to be checked:

1. Is the user logged in? if not show a login page, else check if the request is a post request.

2. Is the request a post request? If not show a form, else handle the form

   def upload(request):
   if request.user.is_authenticated:
       if request.method == 'POST':
       form = forms.DocumentForm()
       return HttpResponse('Handle POST and LoggedIn Prefix Form Validation')
   #return (request, 'upload.html', {'form': form})
   else:
       return HttpResponse('Not Logged In Need to Make Error Landing Page')
   else:
   if request.method == 'POST':
       return HttpResponse('POST but not logged in')
           #return render(request, 'upload.html', {'form': form})