'django - get values from formset

I've tried to get value from formset do some calculations and pass the output. My code is:

    def form_valid(self, form, formset):

        rndid2 = RndIds()

        form.instance.doc_added_by = self.request.user
        form.instance.doc_guid = rndid2.random_doc_guid()

        instances = formset.save(commit=False)
        for instance in instances:
            cd = instance.cleaned_data()
            at_id=cd.get('att_guid')
            instance.att_added_by = str(self.request.user)
            instance.att_ctrl_sum = rndid2.random_doc_application_id(at_id)
            instance.save()
        
        return HttpResponseRedirect(self.get_success_url())

But got an error

 'Att' object has no attribute 'cleaned_data'

Att is my model

How can I get the formset values?

python django

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'django - get values from formset

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