def _ni(field, filter_value):
        """Validate field **NOT IN** string or list.

        Args:
            filter_value (string | list): A string or list of values.

        Returns:
            (boolean): Results of validation
        """
        valid = False
        if field not in filter_value:
            valid = True
        return valid
Validate field **NOT IN** string or list.

        Args:
            filter_value (string | list): A string or list of values.

        Returns:
            (boolean): Results of validation