如何使用scrapy从这个url中抓取多个表行？

import scrapy
from scrapy.selector import Selector

class MySpider(scrapy.Spider):
    name = 'my_spider'
    start_urls = ['http://example.com']

    def parse(self, response):
        # 使用Selector选择器选择表格行
        rows = response.xpath('//table//tr')

        for row in rows:
            # 提取表格行中的数据
            data = {
                'column1': row.xpath('td[1]//text()').get(),
                'column2': row.xpath('td[2]//text()').get(),
                # 添加更多需要提取的列
            }

            yield data

from scrapy.crawler import CrawlerProcess

process = CrawlerProcess()
process.crawl(MySpider)
process.start()