forms.py

class AnagraficaForm(forms.Form):
    usertype = ((1,'Privato'),(0,'Libero professionista/Azienda'))
    nome = forms.CharField(max_length=100)
    cognome = forms.CharField(max_length=100)
    telefono = forms.CharField(max_length=50,required=False)
    email= forms.EmailField(max_length=100,required=False)
    indirizzo = forms.CharField(max_length=100)
    cap = ITZipCodeField(required=False)
    citta = forms.CharField(max_length=100)
    codfisc = ITSocialSecurityNumberField(required=False)
    piva = ITVatNumberField(required=False)

    ragsociale = forms.CharField(max_length=100)
    is_privato = forms.TypedChoiceField(
        initial=1,
        coerce=lambda x: bool(int(x)),
        choices=usertype,
        #using custom renderer to display radio buttons on the same line
        widget=forms.RadioSelect(renderer=HorizRadioRenderer)
    )