def __call__(self, field_data, all_data):
        for field in self.other:
            if all_data.get(field, False) and not field_data:
                raise ValidationError, self.error_message
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-0.96/django/core/validators.py/RequiredIfOtherFieldsGiven.__call__/original