分页问题-无法理解日志

Question

我在得到的日志中看不到任何错误，但只有108个元素被刮除，尽管还有更多的项目要刮除。所以，我想这可能是分页的问题。但不知道如何解决。

这是我得到的缩短日志：

2020-10-22 11:59:17 [scrapy.utils.log] INFO: Scrapy 1.6.0 started (bot: digi_allbooks)
2020-10-22 11:59:17 [scrapy.utils.log] INFO: Versions: lxml 4.5.2.0, libxml2 2.9.10, cssselect 1.1.0, parsel 1.5.2, w3lib 1.21.0, Twisted 20.3.0, Python 3.8.5 (default, Aug  5 2020, 09:44:06) [MSC v.1916 64 bit (AMD64)], pyOpenSSL 19.1.0 (OpenSSL 1.1.1g  21 Apr 2020), cryptography 2.9.2, Platform Windows-10-10.0.19041-SP0
2020-10-22 11:59:17 [scrapy.crawler] INFO: Overridden settings: {'AUTOTHROTTLE_MAX_DELAY': 120, 'AUTOTHROTTLE_START_DELAY': 60, 'BOT_NAME': 'digi_allbooks', 'FEED_FORMAT': 'xml', 'FEED_URI': '99-08-01.xml', 'NEWSPIDER_MODULE': 'digi_allbooks.spiders', 'ROBOTSTXT_OBEY': True, 'SPIDER_MODULES': ['digi_allbooks.spiders']}
2020-10-22 11:59:17 [scrapy.extensions.telnet] INFO: Telnet Password: 2583fc44c0155dc4
2020-10-22 11:59:17 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.corestats.CoreStats',
'scrapy.extensions.telnet.TelnetConsole',
'scrapy.extensions.feedexport.FeedExporter',
'scrapy.extensions.logstats.LogStats']
2020-10-22 11:59:17 [scrapy.middleware] INFO: Enabled downloader middlewares:
['scrapy.downloadermiddlewares.robotstxt.RobotsTxtMiddleware',
'scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware',
'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware',
'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware',
'digi_allbooks.middlewares.UserAgentRotatorMiddleware',
'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']
2020-10-22 11:59:17 [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']
2020-10-22 11:59:17 [scrapy.middleware] INFO: Enabled item pipelines:
[]
2020-10-22 11:59:17 [scrapy.core.engine] INFO: Spider opened
2020-10-22 11:59:17 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2020-10-22 11:59:17 [scrapy.extensions.telnet] INFO: Telnet console listening on 127.0.0.1:6023
2020-10-22 11:59:17 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.digikala.com/robots.txt> (referer: None)
2020-10-22 11:59:17 [scrapy.downloadermiddlewares.redirect] DEBUG: Redirecting (301) to <GET https://www.digikala.com/search/category-book/> from <GET https://www.digikala.com/search/category-book>
2020-10-22 11:59:18 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.digikala.com/search/category-book/> (referer: None)
2020-10-22 11:59:18 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.digikala.com/search/category-book/>
{'title': 'کتاب 1984 اثر جورج اورول نشر شاهدخت پاییز', 'star': 4.6, 'discounted_percent': 69, 'discounted_price': 19900, 'original_price': 65000, 'discounted_amount': 45100, 'url': 'https://www.digikala.com/product/dkp-2824939/کتاب-1984-اثر-جورج-اورول-نشر-شاهدخت-پاییز'}
2020-10-22 11:59:21 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.digikala.com/search/category-book/?sortby=4&pageno=2>
{'title': 'کتاب ملت عشق اثر الیف شافاک', 'star': 4.4, 'discounted_percent': 43, 'discounted_price': 39900, 'original_price': 70000, 'discounted_amount': 30100, 'url': 'https://www.digikala.com/product/dkp-565603/کتاب-ملت-عشق-اثر-الیف-شافاک'}
2020-10-22 11:59:21 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.digikala.com/search/category-book/?sortby=4&pageno=2>
{'title': 'کتاب زنان زیرک اثر شری آرگو', 'star': 4.5, 'discounted_percent': 16, 'discounted_price': 29400, 'original_price': 35000, 'discounted_amount': 5600, 'url': 'https://www.digikala.com/product/dkp-413298/کتاب-زنان-زیرک-اثر-شری-آرگو'}
2020-10-22 11:59:21 [scrapy.core.engine] INFO: Closing spider (finished)
2020-10-22 11:59:21 [scrapy.extensions.feedexport] INFO: Stored xml feed (108 items) in: 99-08-01.xml
2020-10-22 11:59:21 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 2133,
'downloader/request_count': 5,
'downloader/request_method_count/GET': 5,
'downloader/response_bytes': 270896,
'downloader/response_count': 5,
'downloader/response_status_count/200': 4,
'downloader/response_status_count/301': 1,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2020, 10, 22, 8, 29, 21, 140213),
'item_scraped_count': 108,
'log_count/DEBUG': 113,
'log_count/INFO': 10,
'offsite/filtered': 1,
'request_depth_max': 3,
'response_received_count': 4,
'robotstxt/request_count': 1,
'robotstxt/response_count': 1,
'robotstxt/response_status_count/200': 1,
'scheduler/dequeued': 4,
'scheduler/dequeued/memory': 4,
'scheduler/enqueued': 4,
'scheduler/enqueued/memory': 4,
'start_time': datetime.datetime(2020, 10, 22, 8, 29, 17, 564090)}
2020-10-22 11:59:21 [scrapy.core.engine] INFO: Spider closed (finished)

这是我的缩短蜘蛛：

class AllbooksSpider(scrapy.Spider):
name = 'allbooks'
allowed_domains = ['www.digikala.com']

def start_requests(self):
yield scrapy.Request(url= 'https://www.digikala.com/search/category-book',
callback= self.parse)
def parse(self, response):
original_price=0

try:
for product in response.xpath("//ul[@class='c-listing__items js-plp-products-list']/li"):
title= product.xpath(".//div/div[2]/div/div/a/text()").get()
if product.xpath(".//div/div[2]/div[3]/div/div/del/text()"):
original_price= int(str(product.xpath(".//div/div[2]/div[3]/div/div/del/text()").get().strip()).replace(',', ''))
discounted_amount= original_price-discounted_price
else:
original_price= print("not available")
discounted_amount= print("not available") 
yield{
'title':title,
'discounted_amount': discounted_amount
}
next_page= response.xpath('//*[@class="c-pager__item"]/../following-sibling::*//@href').extract_first()
if next_page:
yield scrapy.Request(response.urljoin(next_page))
except AttributeError:
logging.error("The element didn't exist")

你能帮我了解问题是什么以及如何解决吗？

谢谢！！

Answer 1

问题是您的下一页链接选择器
您当前的代码找到当前未激活的第一个分页链接，然后跟随其后的一个。

因此，以下是你的蜘蛛试图遵循的链接：

https://www.digikala.com/search/category-book/?sortby=4&pageno=3
https://www.digikala.com/search/category-book/?sortby=4&pageno=2
javascript:

解决此问题的一种方法是跟随活动一个(@class="c-pager__item is-active"(之后的链接。

另一种产生更简单代码的方法是跟踪每个分页链接，并让dupefilter完成它的工作：

for link in response.css(".c-pager__item"):
yield response.follow(link)