def clean(self):
        cleaned_data = super(PositionForm, self).clean()
        if not self.is_valid():
            return cleaned_data
        if cleaned_data['active_from'] and cleaned_data['active_till']:
            if cleaned_data['active_till'] > cleaned_data['active_from']:
                raise ValidationError(_('Active till must be later than active from.'))
        return cleaned_data
dataset/ETHPy150Open ella/ella/ella/positions/newman_admin.py/PositionForm.clean/swapped operands of `>`