group_one
  [] option_one
  [] option_two
group_two
  [] option_one
  [] options_three

from django import forms
set_a = (("a", "A"),
         ("b", "B"),)

set_b = (("c", "C"),
         ("d", "D"),)

    class Test(forms.Form):
        group_a = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple,
                                         choices=set_a)
        group_a = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple,
                                         choices=set_b)