蜘蛛没有回应

编程问答 2022-08-14

问题描述

我对python和网络抓取非常陌生。我已经准备好解决问题，但没有任何帮助。我想刮掉所有DND自制怪物，以将其描述与原始描述进行比较。我已经准备好了原始版本，但被卡在自制机上。到目前为止，这是我的代码。这是我要抓取的网站：https://www.dndbeyond.com/homebrew/monsters 

import scrapy

from scrapy.crawler import CrawlerProcess


class homebrew(scrapy.Spider):
       
    name = "homebrew"
    custom_settings = {
        'AUTOTHRottLE_ENABLED': True,}
    user_agent = {'User-Agent': "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:79.0) Gecko/20100101 Firefox/79.0"}
    
    handle_httpstatus_list = [403,404]
    
    

    def start_requests(self):       
        
        url = "https://www.dndbeyond.com/homebrew/monsters"     
        yield scrapy.Request(url=url,callback=self.get_urls)
 
    def get_urls(self,response):         
        
        urls = response.xpath('//a[@class = "link"]/@href').getall()
        for link in urls:
            print(link)      #this is my test print. But it never gets any url   

            yield response.follow(url="https://www.dndbeyond.com" + link,callback=self.get_all)
        
        next_page = response.xpath('//a[text()="Next"]/@href').get()       
        if next_page is not None:
           yield response.follow(url=next_page,callback=self.get_urls)
        
        
        
          
        
    def get_all(self,response):   #here follows other code,not relevant for my question```

This is my output:
2020-08-27 15:33:48 [scrapy.crawler] INFO: Overridden settings: {'AUTOTHRottLE_ENABLED': True}
2020-08-27 15:33:48 [scrapy.extensions.telnet] INFO: Telnet Password: 1e7e3a035d452c29
2020-08-27 15:33:48 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.corestats.CoreStats','scrapy.extensions.telnet.TelnetConsole','scrapy.extensions.logstats.LogStats','scrapy.extensions.throttle.AutoThrottle']
2020-08-27 15:33:48 [scrapy.middleware] INFO: Enabled downloader middlewares:
['scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware','scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware','scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware','scrapy.downloadermiddlewares.useragent.UserAgentMiddleware','scrapy.downloadermiddlewares.retry.RetryMiddleware','scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware','scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware','scrapy.downloadermiddlewares.redirect.RedirectMiddleware','scrapy.downloadermiddlewares.cookies.CookiesMiddleware','scrapy.downloadermiddlewares.httpproxy.HttpProxyMiddleware','scrapy.downloadermiddlewares.stats.DownloaderStats']
2020-08-27 15:33:48 [scrapy.middleware] INFO: Enabled spider middlewares:
['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware','scrapy.spidermiddlewares.offsite.OffsiteMiddleware','scrapy.spidermiddlewares.referer.RefererMiddleware','scrapy.spidermiddlewares.urllength.UrlLengthMiddleware','scrapy.spidermiddlewares.depth.DepthMiddleware']
2020-08-27 15:33:48 [scrapy.middleware] INFO: Enabled item pipelines:
[]
2020-08-27 15:33:48 [scrapy.core.engine] INFO: Spider opened
2020-08-27 15:33:48 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min),scraped 0 items (at 0 items/min)
2020-08-27 15:33:48 [scrapy.extensions.telnet] INFO: Telnet console listening on 127.0.0.1:6023
2020-08-27 15:33:49 [scrapy.core.engine] DEBUG: Crawled (403) <GET https://www.dndbeyond.com/homebrew/monsters> (referer: None)
2020-08-27 15:33:49 [scrapy.core.engine] INFO: Closing spider (finished)
2020-08-27 15:33:49 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 209,'downloader/request_count': 1,'downloader/request_method_count/GET': 1,'downloader/response_bytes': 3881,'downloader/response_count': 1,'downloader/response_status_count/403': 1,'finish_reason': 'finished','finish_time': datetime.datetime(2020,8,27,13,33,49,213985),'log_count/DEBUG': 1,'log_count/INFO': 9,'response_received_count': 1,'scheduler/dequeued': 1,'scheduler/dequeued/memory': 1,'scheduler/enqueued': 1,'scheduler/enqueued/memory': 1,'start_time': datetime.datetime(2020,48,870714)}
2020-08-27 15:33:49 [scrapy.core.engine] INFO: Spider closed (finished)

解决方法

class homebrew(scrapy.Spider):
       
    name = "homebrew"
    custom_settings = {
        'AUTOTHROTTLE_ENABLED': True,}
    user_agent = {'User-Agent': "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:79.0) Gecko/20100101 Firefox/79.0"}
    
    handle_httpstatus_list = [403,404]
    
    

    def start_requests(self):       
        
        url = "https://www.dndbeyond.com/homebrew/monsters"     
        yield scrapy.Request(url=url,callback=self.get_urls)
 
    def get_urls(self,response):         
        
        urls = response.xpath('//a[@class="link"]/@href').extract()
        for link in urls:
            yield scrapy.Request(url="https://www.dndbeyond.com" + link,callback=self.get_all)
        
        next_page = response.xpath('//a[@rel="next"]/@href').extract_first() 
        if next_page:
           yield scrapy.Request(url=next_page,callback=self.get_urls)

-您的xpath错误（删除空格）

-不要以这种方式使用response.follow

-if next_page is not None是不好的编程用法，if next_page

pythonresponsescrapyweb-scraping