try, except problem

I'm trying to write a try: except: to check for three things. First I want to check if an application has already been filled out, thus, check for existence. Second if it has been filled out a flag that is is complete is set to true. Then the else would be neither of those things, they need to create a new app.

This is what I have started with:

class Main(TemplateView):

    # app_started = Application.objects.get(created_by=request.user)

    @method_decorator(login_required(login_url='/accounts/login/'))

    def dispatch(self, *args, **kwargs):

        try:

            app = Application.objects.get(created_by=self.request.user)

            # if it is true check for if the app is set to complete

        except app.DoesNotExist:

            app = None

            return HttpResponseRedirect(reverse('requestform:registrant_create'))

        else:

            return HttpResponseRedirect(reverse('requestform:registrant_update'))

I keep getting this error:

local variable 'app' referenced before assignment


Why would app not be not be set if it is in the try statement?


How would I check if it does exist, to then check if the flag is true?


I'm sort of a Django newbie and this portion of the code I am writing is really mystifying me.

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