刮擦的网络爬行变坏了

Question

我是scrapy的新手，并试图通过抓取 yellowpages.com 网站来理解它。

我的目标是编写一个python代码来输入 yellowpages.com 主页的搜索字段（业务和位置），然后抓取后续URL。

我的代码看起来像这样：

import scrapy
from scrapy.spiders import Spider
from scrapy.selector import Selector
from spider.items import Website
class YellowPages(Spider):
    name = "yellow"
    allowed_domains = ["yellowpages.com"]
    start_urls = [
        "http://www.yellowpages.com/"
    ]
    def parse(self, response):
        return scrapy.FormRequest.from_response(
            response,
            formxpath="//form[@id='search-form']",
            formdata={
                "query":"business",
                "location" : "78735" },
            callback=self.after_results
        )
    def after_results(self, response):
        self.logger.info("info msg")

我想在位置"78735"搜索"业务"。但是，这些不是传递给网站的值。我的日志看起来像这样：

2016-01-28 23:55:36 [scrapy] DEBUG: Crawled (200) <GET http://www.yellowpages.com/> (referer: None)

2016-01-28 23:55:36 [scrapy] DEBUG: Crawled (200) <GET http://www.yellowpages.com/search?search_terms=&geo_location_terms=Los+Angeles%2C+CA&query=business&location=78735> (referer: http://www.yellowpages.com/)

在第二个 url 中，以某种方式插入了术语 Los +Angeles。当我尝试手动输入搜索字段并提交时，网址应该是这样的：

http://www.yellowpages.com/search?search_terms=business&geo_location_terms=78735

有人可以告诉我出了什么问题以及如何解决吗？

多谢。

仅供参考，这里是 yellowpages.com 主页的HTML源代码部分

<div class="search-bar"><form id="search-form" action="/search" method="GET"><div><label><span>What do you want to find?</span><input id="query" type="text" value="" placeholder="What do you want to find?" autocomplete="off" data-onempty="recent-searches" name="search_terms" tabindex="1"/></label><ul id="recent-searches" class="search-dropdown recent-searches"><li class="search-hint">Search by<b> business name,</b> or<b> keyword</b></li></ul><ul id="autosuggest-term" data-analytics='{"moi":105}' class="search-dropdown autosuggest-term"></ul></div><em>near</em><div><label><span>Where?</span> <input id="location"type="text" value="78735" placeholder="Where?" autocomplete="off" data-onempty="menu-location" name="geo_location_terms" tabindex="2"/></label>

Answer 1

设置search_terms和geo_location_terms表单参数：

def parse(self, response):
    return scrapy.FormRequest.from_response(
        response,
        formxpath="//form[@id='search-form']",
        formdata={
            "search_terms": "business",
            "geo_location_terms" : "78735"},
        callback=self.after_results
    )

使用以下蜘蛛进行测试：

import scrapy
from scrapy.spiders import Spider

class YellowPages(Spider):
    name = "yellow"
    allowed_domains = ["yellowpages.com"]
    start_urls = [
        "http://www.yellowpages.com/"
    ]
    def parse(self, response):
        return scrapy.FormRequest.from_response(
            response,
            formxpath="//form[@id='search-form']",
            formdata={
                "search_terms":"business",
                "geo_location_terms" : "78735"},
            callback=self.after_results
        )
    def after_results(self, response):
        for result in response.css("div.result a[itemprop=name]::text").extract():
            print(result)

打印"德克萨斯州奥斯汀"中的企业列表：

Prism Solutions
Time Agent
Stuart Consulting
Jones REX L
Medical Informatics & Tech Inc
J E Andrews INC
...
Hicks Consulting