是否可以从表中扫描一行并仅更改列，以获取一系列数字。我目前正在使用许多变量。

示例：

response.xpath('/html/body/div/table/tr[6]/td[counter in range 2 - 9]/p/span/text()').extract()

代码：

class MainSpider(scrapy.Spider):
    name = "main-spider"
    start_urls = ['http://www.institutosantatereza.com.br/boletins/turma_3_ano_ensino_medio/1652.htm']


    def parse(self,response):
        nome = response.xpath('/html/body/div/table/tr[2]/td[2]/p/b/span/text()').extract()
        serie = response.xpath('/html/body/div/table/tr[2]/td[7]/p/b/span/text()').extract()


        portugues1 = response.xpath('/html/body/div/table/tr[6]/td[2]/p/span/text()').extract()
        portugues2 = response.xpath('/html/body/div/table/tr[6]/td[3]/p/span/text()').extract()
        portuguesMedia1 = response.xpath('/html/body/div/table/tr[6]/td[4]/p/span/text()').extract()


        yield{
            "nome": nome[0],"serie": serie[0],"url": response.url,"disciplinas":{
                "portugues":{
                    'nota1': portugues1[0],'nota2': portugues2[0],'media1': portuguesMedia1[0],}
            }
        }