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老師問一下，response.text可以打印出top250頁面。但是i_item無法打印，可能是什么原因造成的？

#?-*-?coding:?utf-8?-*-
import?scrapy
from??douban.items?import?DoubanItem


class?DoubanSpiderSpider(scrapy.Spider):
????#這素爬蟲名稱
????name?=?"douban_spider"
????#容許的域名
????allowed_domains?=?["movie.douban.com"]
????#入口url，扔到調(diào)度器里面去
????start_urls?=?['https://movie.douban.com/top250']

????def?parse(self,?response):
????????#print(response.text)
????????movie_list?=?response.xpath("http://div[@class='article']//ol[@class='gril_view']/li/")
????????#?print(movie_list)
????????for?i_item?in?movie_list:
?????????????#?douban_item?=?DoubanItem()
?????????????#?douban_item['serial_number']?=?i_item.xpath(".//div[@class='item']//em/text()").extract_first()
?????????????print(i_item)

我用的環(huán)境是python3.7。

慕沐0348027

2018-08-10

源自：Python最火爬蟲框架Scrapy入門與實(shí)踐 2-7

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qq_客欲遠(yuǎn)行_0 回答被采納 +2 積分
2018-08-10

貼一下完整代碼一起看看

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李?yuàn)p
2019-05-04

后面多了個(gè)/

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qq_客欲遠(yuǎn)行_0
2018-08-11

打印的結(jié)果中沒有報(bào)錯(cuò)，只是沒有爬取到內(nèi)容，這種情況一般檢查代碼中的url入口，xpath的路徑信息。因?yàn)槿魏蝺?nèi)容都沒有爬取到，所以應(yīng)該是根節(jié)點(diǎn)的問題，看這行代碼

movie_list?=?response.xpath("http://div[@class='article']//ol[@class='gril_view']/li/")

gril_view 寫錯(cuò)了，改一下試試能不能解決問題

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#1

慕沐0348027 提問者

嗯嗯，問題解決了，我換了一種方式獲得值了，就是xpath的問題。

2018-08-11 回復(fù) 有任何疑惑可以回復(fù)我~

#2

WhiteXyloseTaste 回復(fù) 慕沐0348027 提問者

請(qǐng)問我也是這個(gè)問題，怎么解決呢

2018-11-17 回復(fù) 有任何疑惑可以回復(fù)我~

慕沐0348027 提問者
2018-08-10

C:\Users\84199\AppData\Local\Programs\Python\Python37\python.exe D:/scrapy/douban/douban/main.py
2018-08-10 21:41:52 [scrapy.utils.log] INFO: Scrapy 1.5.1 started (bot: douban)
2018-08-10 21:41:52 [scrapy.utils.log] INFO: Versions: lxml 4.2.4.0, libxml2 2.9.5, cssselect 1.0.3, parsel 1.5.0, w3lib 1.19.0, Twisted 18.7.0, Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit (AMD64)], pyOpenSSL 18.0.0 (OpenSSL 1.1.0h? 27 Mar 2018), cryptography 2.3, Platform Windows-10-10.0.17134-SP0
2018-08-10 21:41:52 [scrapy.crawler] INFO: Overridden settings: {'BOT_NAME': 'douban', 'NEWSPIDER_MODULE': 'douban.spiders', 'ROBOTSTXT_OBEY': True, 'SPIDER_MODULES': ['douban.spiders'], 'USER_AGENT': 'Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Mobile Safari/537.36'}
2018-08-10 21:41:52 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.corestats.CoreStats',
?'scrapy.extensions.telnet.TelnetConsole',
?'scrapy.extensions.logstats.LogStats']
2018-08-10 21:41:52 [scrapy.middleware] INFO: Enabled downloader middlewares:
['scrapy.downloadermiddlewares.robotstxt.RobotsTxtMiddleware',
?'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']
2018-08-10 21:41:52 [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']
2018-08-10 21:41:52 [scrapy.middleware] INFO: Enabled item pipelines:
[]
2018-08-10 21:41:52 [scrapy.core.engine] INFO: Spider opened
2018-08-10 21:41:52 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2018-08-10 21:41:52 [scrapy.extensions.telnet] DEBUG: Telnet console listening on 127.0.0.1:6023
2018-08-10 21:41:53 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://movie.douban.com/robots.txt> (referer: None)
2018-08-10 21:41:53 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://movie.douban.com/top250> (referer: None)
[]
2018-08-10 21:41:53 [scrapy.core.engine] INFO: Closing spider (finished)
2018-08-10 21:41:53 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 646,
?'downloader/request_count': 2,
?'downloader/request_method_count/GET': 2,
?'downloader/response_bytes': 13402,
?'downloader/response_count': 2,
?'downloader/response_status_count/200': 2,
?'finish_reason': 'finished',
?'finish_time': datetime.datetime(2018, 8, 10, 13, 41, 53, 345844),
?'log_count/DEBUG': 3,
?'log_count/INFO': 7,
?'response_received_count': 2,
?'scheduler/dequeued': 1,
?'scheduler/dequeued/memory': 1,
?'scheduler/enqueued': 1,
?'scheduler/enqueued/memory': 1,
?'start_time': datetime.datetime(2018, 8, 10, 13, 41, 52, 902343)}
2018-08-10 21:41:53 [scrapy.core.engine] INFO: Spider closed (finished)