Django: How to pass a POST to a form for processing?

Question

Django

Hello. I have this form:

class LocalityForm(forms.Form):<br>
   region = forms.ModelChoiceField(queryset=Region.objects.all(), required=False, empty_label="")<br>
   locality = forms.ModelChoiceField(queryset=Locality.objects.none(), required=False, empty_label="")<br><br>
   #для того чтоб можно было выбрать населенный пункт в зависимости от<br>
   #региона переданного в POST, а так же вернуть введенные уже данные дописал к форме так<br>
   def __init__(self, data = None, *args, **kwargs):<br>
       super(forms.Form, self).__init__(*args, **kwargs)<br>
       if data:<br>
         if data.get('region'):<br>
           self.reg = data['region']<br>
           self.fields['region'].initial = self.reg<br>
           self.fields['locality'].queryset = Locality.objects.filter(region=self.reg).order_by('name')<br>
         if data.get('locality'):<br>
           self.loc = data['locality']<br>
           self.fields['locality'].initial = self.loc<br>

called quite simply form = LocalityForm(request.POST)
But then the form validation disappears, i.e. the form is obtained in any case not valid, apparently due to the interception of POST data by the data argument.
I don’t want to pass through named arguments - because the form call becomes rather idiotic
form = LocalityForm(request.POST, region = request.POST['region'], locality = request.POST['locality'])
Although if there is no other solution, then apparently you have to be content with what you have.