ValueError Traceback(最近一次调用)，python scrapy terminal

Question

我在终端 scrapy shell 中运行此代码，它会产生一个错误作为 ValueError Traceback。 要解压缩的值太多（预期为 2）。例如：品牌 - A ，猫 - AA，BB，CC，DD 品牌 - B ， 猫 - AA，SS，DD，FF

    scrapy shell 
    cats = response.xpath('//*[@class="leftNavCategoriesNodePopup"]')
    brands = response.xpath('//*[@class="leftNavCategoriesNode"]')
    for cat, brand in cats, brands:
        ca = cat.xpath('.//*[@class="leftNavCategoriesNodePopupColumn"]/a/@href').extract()
        br = brand.xpath('.//*[@class="leftNavCategoriesNodeName"]/text()').extract()
        print(ca)
        print(br)

值错误回溯（最近一次调用）

Answer 1

你确定，猫+品牌的长度相同吗？ 如果是，则用作：

for cat, brand in zip(cats, brands):
    #Your work goes here.

Answer 2

    cats = response.xpath('//*[@class="leftNavCategoriesNodePopup"]')
    brands = response.xpath('//*[@class="leftNavCategoriesNode"]')
    for cat,brand in zip(cats, brands):
        ca = cat.xpath('.//*[@class="leftNavCategoriesNodePopupColumn"]/a')
        br = brand.xpath('.//*[@class="leftNavCategoriesNodeName"]/text()').extract()
        for c in ca:
            cq = c.xpath('.//@href').extract()
            yield{'br':br, 'cq':cq}