-есть форма:
class SelectForm(forms.Form):
    genre = forms.ChoiceField(label=u'Жанр', widget = forms.RadioSelect)

-и вьюшка:
def input(request):
    if request.method == 'POST':
        inpForm=cineforms.SelectForm(request.POST)
        if inpForm.is_valid():
            print "Valid"
    else:
        choice=[]
        for i, v in GenreDict.items():
            choice.append((i, v))
        inpForm=cineforms.CinegenSelectForm()
        inpForm.fields['genre'].choices=choice
    return render_to_response('input_form.html', {'inpForm': inpForm})

CHOICE=(('Detectiv', 'Детектив'),)

class SelectForm(forms.Form):
    genre = forms.ChoiceField(label=u'Жанр', widget = forms.RadioSelect, choices=CHOICE)