Django Filter Model by Dictionary

How does one do a filter on a Django Model using a Dictionary rather than method arguments? This is what I have right here:

class StoreView(TemplateView):

    def get(self, request):

        # A bunch of gets
        sort = request.GET.get('sort')
        sort_price = request.GET.get('sort_price')
        sort_mfr_method = request.GET.get('mfr_method')

        # The params tpsort by
        sort_params = {}

        if sort is not None:
            sort_params['sort'] = sort

        if sort_price is not None:
            sort_params['sort_price'] = sort_price

        if sort_mfr_method is not None:
            sort_params['sort_mfr_method'] = sort_mfr_method

        # The Model Query
        design_list = models.Design.objects.filter(sort_params)

        # etc...

Side Question, is there a better way set the dictionary values than what I'm doing above? Such as a ternary, yet in a way that would make the value not exist if it's none?

sort_params['sort'] = sort if not None else ''