def clean_password(self):
        if self.data['password'] != self.data['password2']:
            raise forms.ValidationError('Passwords are not the same')
        return self.data['password']
    
    def clean(self,*args, **kwargs):
        self.clean_email()
        self.clean_password()
        raise forms.ValidationError('UserError')

class RegistrationForm(forms.Form):
    ...
    password_1 = forms.CharField(label=_('Password'), widget=forms.PasswordInput(render_value=False))
    password_2 = forms.CharField(label=_('Re-type'), widget=forms.PasswordInput(render_value=False))
    ...
    def clean(self):
        """
        Validate password_1 and password_2 values
        """
        if 'password_1' in self.cleaned_data and 'password_2' in self.cleaned_data:
            if self.cleaned_data['password_1'] != self.cleaned_data['password_2']:
                e = forms.ValidationError(_('You must type the same password each time.'))
                self._errors['password_2'] = e.messages
                raise e
        return self.cleaned_data