How to use the xmltodict.ParsingInterrupted function in xmltodict

def test_streaming_interrupt(self):
        cb = lambda path, item: False
        self.assertRaises(ParsingInterrupted,
                          parse, '<a>x</a>',
                          item_depth=1, item_callback=cb)

def _handle_result(self, res):
        res.encoding = 'utf-8'
        xml = res.text
        try:
            data = xmltodict.parse(xml)['xml']
        except (xmltodict.ParsingInterrupted, ExpatError):
            # 解析 XML 失败
            return xml

        return_code = data['return_code']
        return_msg = data.get('return_msg')
        result_code = data.get('result_code')
        errcode = data.get('err_code')
        errmsg = data.get('err_code_des')
        if return_code != 'SUCCESS' or result_code != 'SUCCESS':
            # 返回状态码不为成功
            raise WeChatPayException(
                return_code,
                result_code,
                return_msg,
                errcode,
                errmsg,

def endElement(self, full_name):
        name = self._build_name(full_name)
        if len(self.path) == self.item_depth:
            item = self.item
            if item is None:
                item = (None if not self.data
                        else self.cdata_separator.join(self.data))

            should_continue = self.item_callback(self.path, item)
            if not should_continue:
                raise ParsingInterrupted()
        if len(self.stack):
            data = (None if not self.data
                    else self.cdata_separator.join(self.data))
            item = self.item
            self.item, self.data = self.stack.pop()
            if self.strip_whitespace and data:
                data = data.strip() or None
            if data and self.force_cdata and item is None:
                item = self.dict_constructor()
            if item is not None:
                if data:
                    self.push_data(item, self.cdata_key, data)
                self.item = self.push_data(self.item, name, item)
            else:
                self.item = self.push_data(self.item, name, data)
        else: