class Users(models.Model):
    login = models.CharField(unique=True, max_length=255)
    password = models.CharField(max_length=255)
    date_create = models.DateTimeField()

class RegForm(forms.ModelForm):
    login = forms.CharField(label='Логин')
    password = forms.CharField(label='Пароль', widget=forms.PasswordInput)
    class Meta:
        model = Users
        exclude = ('date_create')

def reg(request):
    ''' Регистрация нового пользователя '''
    if request.method == 'POST':
        form = RegForm(request.POST)
        if form.is_valid():
            u = form.save()
            return HttpResponseRedirect('/')
    else:
        form = RegForm()
    return render_to_response('reg.html', {'form': form})

#forms.py
...
class RegFormU(MyModelForm):
    login = forms.CharField(label='Логин', min_length = 4)
    password = forms.CharField(label='Пароль', widget=forms.PasswordInput, max_length = 10)
    confirm_password = forms.CharField(label='Подтверждение', widget=forms.PasswordInput, max_length = 10)
    def check_pass(self):
        if self.password == self.confirm_password:
            return True
        else:
            return False
    class Meta:
        model = Users
...
#view.py
...
form_u = RegFormU(request.POST)
if form_u.check_pass():
...