How to create a Dynamic Hierarchical Form

I am trying to create a form where you select product(s) and technology(s) and based on your selection different modules are available for selection.

forms.py

def make_quiz_form_class():      #Listing available options      products = [(i, _(i)) for i in Product.objects.all()]      technologies    = [(i, _(i)) for i in Technology.objects.all()]      modules = [(i, _(i)) for i in Module.objects.filter(product=selected_products, technologies=selected_technologies)]        class _QuizForm(forms.Form):          selected_products = forms.ChoiceField(choices = products, widget=forms.RadioSelect())          selected_technologies = forms.ChoiceField(choices = technologies, widget=forms.RadioSelect())          selected_modules = forms.ChoiceField(choices = modules, widget=forms.RadioSelect())        return _QuizForm

views.py

form_class = make_quiz_form_class()  form = form_class(request.POST)

The problem is selected_products and selected_technologies are not defined for modules

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