带“scrapy”的Python web抓取：不从span中提取文本

Question

问题出在第54行

port = data.xpath('./td[3]/span[@class="port"]/text()').extract_first()

完整代码

import json
import re
import urllib
from html.parser import HTMLParser
from urllib.parse import urljoin

from scrapy import Field, Item, Selector
from scrapy.http import FormRequest, HtmlResponse, Request
from scrapy.spiders import CrawlSpider

from requests import Session


class ProxyServersPro(Item):
    ip = Field()
    port = Field()
    country = Field()
    speed = Field()
    protocol = Field()
    anon = Field()
    lastcheck = Field()
    speed = Field()


class ProxyServers(CrawlSpider):
    name = "ProxyServersProCrawler"

    allowed_domains = ["proxyservers.pro"]
    headers = {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36",
        "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
        "Accept-Language": "en-US,en;q=0.5",
        "Accept-Encoding": "gzip, deflate",
        "Connection": "keep-alive",
    }
    start_url = [
        "https://es.proxyservers.pro/proxy/list/speed/2/anonymity/elite/order/duration/order_dir/asc/page/1",
        "https://es.proxyservers.pro/proxy/list/speed/2/anonymity/elite/order/duration/order_dir/asc/page/2",
        "https://es.proxyservers.pro/proxy/list/speed/2/anonymity/elite/order/duration/order_dir/asc/page/3",
        "https://es.proxyservers.pro/proxy/list/speed/2/anonymity/elite/order/duration/order_dir/asc/page/4",
        "https://es.proxyservers.pro/proxy/list/speed/2/anonymity/elite/order/duration/order_dir/asc/page/5",
    ]

    def __init__(self):
        super(ProxyServers, self).__init__()

    def start_requests(self):
        for url in self.start_url:
            yield Request(url, callback=self.parse_companies, headers=self.headers)

    def parse_companies(self, response):
        table = response.xpath('//table[@class="table table-hover"]/tbody/tr')
        for data in table:
            ip = data.xpath("./td[2]/a/text()").extract_first()
            country = data.xpath("./td[4]/text()").extract_first()
            protocol = data.xpath("./td[7]/text()").extract_first()
            anon = data.xpath("./td[8]/text()").extract_first()
            port = data.xpath('./td[3]/span[@class="port"]/text()').extract_first()

            item = ProxyServersPro()
            item["ip"] = ip
            item["country"] = country
            item["protocol"] = protocol
            item["anon"] = anon
            item["port"] = port
            yield item

Answer 1

Scrapy没有提取值，因为范围中没有文本

试试这个：

(Pdb) data.xpath('./td[3]/span/@data-port').extract_first() '050F040E'