Formset API reference. For introductory material about formsets, see the Formsets topic guide.
formset_factoryformset_factory(form, formset=BaseFormSet, extra=1, can_order=False, can_delete=False, max_num=None, validate_max=False, min_num=None, validate_min=False) [source]
Returns a FormSet class for the given form class.
See formsets for example usage.
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    https://docs.djangoproject.com/en/1.11/ref/forms/formsets/