How to use the vulture.core.Item function in vulture

def _define(self, collection, name, first_node, last_node=None,
                message='', confidence=DEFAULT_CONFIDENCE, ignore=None):
        last_node = last_node or first_node
        typ = collection.typ
        if (ignore and ignore(self.filename, name)) or _match(
                name, self.ignore_names):
            self._log('Ignoring {typ} "{name}"'.format(**locals()))
        else:
            first_lineno = first_node.lineno
            last_lineno = lines.get_last_line_number(last_node)
            collection.append(
                Item(name, typ, self.filename, first_lineno, last_lineno,
                     message=message, confidence=confidence))