How to use the redfish.ris.rmc_helper.InstanceNotFoundError function in redfish

def filter(self, query, sel, val):
        """Main function for filter command

        :param query: query string.
        :type query: str.
        :param sel: the type selection for the select operation.
        :type sel: str.
        :param val: value for the property to be modified.
        :type val: str.
        :returns: returns a list of selected items

        """
        if query:
            if isinstance(query, list):
                if len(query) == 0:
                    raise InstanceNotFoundError("Unable to locate instance " \
                                                            "for '%s'" % query)
                else:
                    query = query[0]

            selection = self.get_selection(selector=query, sel=sel, val=val)

            if selection and len(selection) > 0:
                self.current_client.selector = query
                self.current_client.filter_attr = sel
                self.current_client.filter_value = val
                self.save()

            return selection

if selection and len(selection) > 0:
                self.current_client.selector = query

                if not sel is None and not val is None:
                    self.current_client.filter_attr = sel
                    self.current_client.filter_value = val
                else:
                    self.current_client.filter_attr = None
                    self.current_client.filter_value = None

                self.save()
                return selection

        if not sel is None and not val is None:
            raise InstanceNotFoundError("Unable to locate instance for" \
                                " '%s' and filter '%s=%s'" % (query, sel, val))
        else:
            raise InstanceNotFoundError("Unable to locate instance for" \
                                                                " '%s'" % query)