如何使用scrapy将表格转换为单个文本块

import scrapy

class TableItem(scrapy.Item):
    text_block = scrapy.Field()

import scrapy
from project_name.items import TableItem

class TableSpider(scrapy.Spider):
    name = 'table_spider'
    start_urls = ['http://example.com/table.html']

    def parse(self, response):
        table_rows = response.xpath('//table//tr')
        text_block = ''

        for row in table_rows:
            cells = row.xpath('.//td/text()').getall()
            text_block += ' '.join(cells) + '\n'

        item = TableItem()
        item['text_block'] = text_block
        yield item

ITEM_PIPELINES = {
    'project_name.pipelines.TablePipeline': 300,
}

class TablePipeline:
    def process_item(self, item, spider):
        text_block = item['text_block']
        # 进一步处理或保存文本块
        return item