python - scrapy 的问题:抓取 0 页(以 0 页/分钟),抓取 0 个项目(以 0 个项目/分钟)
问题描述
我刚刚完成了一个 Scrapy 教程,然后我开始将我迄今为止所学的知识应用到一个新项目中。我正在尝试抓取一个论坛站点,但它基本上什么也没抓取...我已经检查了来自 scrapy shell 的 xpath 表达式,我总是得到想要的结果,但是当我从终端运行 crawl 命令时,它最终得到 0 个已爬取的页面. 经过数小时的杂乱无章的教程阅读和多次尝试后,我仍然没有任何进展。我错过了什么?感谢帮助
下面是代码:
import scrapy
from scrapy.linkextractors import LinkExtractor
from scrapy.spiders import CrawlSpider, Rule
class ParserSpider(CrawlSpider):
name = 'parser'
allowed_domains = ['www.eksisozluk.com']
start_urls = ['https://eksisozluk.com/basliklar/gundem']
rules = (
Rule((LinkExtractor(
restrict_xpaths="//ul[@class='topic-list']/li/a")), callback='parse_item', follow=True, ),
)
def parse_item(self, response):
yield {
'title': response.xpath("//h1[@id='title']/a/text()").getall(),
'entry': response.xpath("//div[@class='content']text()").getall(),
'yazar': response.xpath("//a[@class='entry-author']/text()").getall(),
'title': response.xpath("//a[@class='entry-date permalink']/text()").getall(),
}
和输出:
...
2021-01-11 20:05:46 [scrapy.core.engine] INFO: Spider opened
2021-01-11 20:05:46 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2021-01-11 20:05:46 [scrapy.extensions.telnet] INFO: Telnet console listening on 127.0.0.1:6024
2021-01-11 20:05:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://eksisozluk.com/robots.txt> (referer: None)
2021-01-11 20:05:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://eksisozluk.com/basliklar/gundem> (referer: None)
2021-01-11 20:05:48 [scrapy.spidermiddlewares.offsite] DEBUG: Filtered offsite request to 'eksisozluk.com': <GET https://eksisozluk.com/11-ocak-2021-kabine-toplantisi-kararlari--6794884?a=popular>
2021-01-11 20:05:48 [scrapy.core.engine] INFO: Closing spider (finished)
2021-01-11 20:05:48 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 499,
'downloader/request_count': 2,
'downloader/request_method_count/GET': 2,
'downloader/response_bytes': 20870,
'downloader/response_count': 2,
'downloader/response_status_count/200': 2,
'elapsed_time_seconds': 1.416214,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2021, 1, 11, 17, 5, 48, 192682),
'log_count/DEBUG': 3,
'log_count/INFO': 10,
'memusage/max': 54054912,
'memusage/startup': 54054912,
'offsite/domains': 1,
'offsite/filtered': 50,
'request_depth_max': 1,
'response_received_count': 2,
'robotstxt/request_count': 1,
'robotstxt/response_count': 1,
'robotstxt/response_status_count/200': 1,
'scheduler/dequeued': 1,
'scheduler/dequeued/memory': 1,
'scheduler/enqueued': 1,
'scheduler/enqueued/memory': 1,
'start_time': datetime.datetime(2021, 1, 11, 17, 5, 46, 776468)}
2021-01-11 20:05:48 [scrapy.core.engine] INFO: Spider closed (finished)
解决方案
乍一看,我建议您更改 4 件事,这可能会增加您的spider
运行正确返回刮取数据的机会:
1)
callback='parse_item'
, ---> callback=self.parse_item
2)
allowed_domains = ['www.eksisozluk.com']
---> allowed_domains = ['eksisozluk.com']
3)
'title': response.xpath("//a[@class='entry-date permalink']/text()").getall(),
--->
'title': response.xpath("//a[@class='entry-date permalink']/text()").getall()
4)
follow=True, )
---> follow=True)
更正以上所有内容,您的代码变为:
import scrapy
from scrapy.linkextractors import LinkExtractor
from scrapy.spiders import CrawlSpider, Rule
class ParserSpider(CrawlSpider):
name = 'parser'
allowed_domains = ['eksisozluk.com']
start_urls = ['https://eksisozluk.com/basliklar/gundem']
rules = (
Rule((LinkExtractor(
restrict_xpaths="//ul[@class='topic-list']/li/a")), callback=self.parse_item, follow=True),
)
def parse_item(self, response):
yield {
'title': response.xpath("//h1[@id='title']/a/text()").getall(),
'entry': response.xpath("//div[@class='content']text()").getall(),
'yazar': response.xpath("//a[@class='entry-author']/text()").getall(),
'title': response.xpath("//a[@class='entry-date permalink']/text()").getall()
}
另外,我建议保留你的 maincallback
函数为 name parse()
,因为如果一个 Request 没有指定回调,蜘蛛的parse()
方法将被使用,即scrapy
正在寻找一个名为 的方法parse()
。
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