python - Scrapy webscraping输出页面中缺少的元素

Question

我试图从亚马逊上的 URL 中刮取 SSD 的价格，但刮板只返回一些价格。请解释我哪里出错了，我是scrapy的新手。

import scrapy
from scrapy import Spider

class SSDSpider(scrapy.Spider):
   name = "SSD_spider"
   start_urls = ['https://www.amazon.ca/s/ref=nb_sb_noss_2?url=search- 
   alias%3Daps&field-keywords=ssd']

   def parse(self, response):
       for ssd in response.css('.
            NAME_SELECTOR = '//span[contains(@class,"a-size-base a- 
            color-price s-price a-text-bold")]/text()'
            yield {
                'price': response.xpath(NAME_SELECTOR).extract()
            }

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