Question

我正在尝试学习scrapy和python。我使用的网址是https://www.riddles.com/jokes-and-riddles在conda控制台中，response.css可以正常工作并提取“ Riddle”字词。但是，当尝试在Visual Studio中运行spyder时，它将加载所有内容并运行，但是没有数据导出。

蜘蛛

import scrapy
from ..items import BookItem 

class BookSpiderSpider(scrapy.Spider):
    name = "book_spider"
    start_urls = (
        'https://www.riddles.com/jokes-and-riddles',
    )

def parse(self, response) :
    items = BookItem()

    title_name = response.css('span.hidden-print::text').extract()

    items['title_name'] = title_name

    yield items

项目

import scrapy


class BookItem(scrapy.Item):

    title_name = scrapy.Field()
    pass

控制台

(scrapper) C:\Users\Naked\tutorial\book\book>scrapy crawl book_spider
2019-05-02 14:07:04 [scrapy] INFO: Scrapy 1.1.1 started (bot: book)
2019-05-02 14:07:04 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'book.spiders',
'ROBOTSTXT_OBEY': True, 'SPIDER_MODULES': ['book.spiders'], 'BOT_NAME': 'book'}
2019-05-02 14:07:05 [scrapy] INFO: Enabled extensions:
['scrapy.extensions.telnet.TelnetConsole',
 'scrapy.extensions.logstats.LogStats',
 'scrapy.extensions.corestats.CoreStats']
2019-05-02 14:07:05 [scrapy] INFO: Enabled downloader middlewares:
['scrapy.downloadermiddlewares.robotstxt.RobotsTxtMiddleware',
 'scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware',
 'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware',
 'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware',
 'scrapy.downloadermiddlewares.retry.RetryMiddleware',
 'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware',
 'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware',
 'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware',
 'scrapy.downloadermiddlewares.redirect.RedirectMiddleware',
 'scrapy.downloadermiddlewares.cookies.CookiesMiddleware',
 'scrapy.downloadermiddlewares.chunked.ChunkedTransferMiddleware',
 'scrapy.downloadermiddlewares.stats.DownloaderStats']
2019-05-02 14:07:05 [scrapy] INFO: Enabled spider middlewares:
['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',
 'scrapy.spidermiddlewares.offsite.OffsiteMiddleware',
 'scrapy.spidermiddlewares.referer.RefererMiddleware',
 'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',
 'scrapy.spidermiddlewares.depth.DepthMiddleware']
2019-05-02 14:07:05 [scrapy] INFO: Enabled item pipelines:
[]
2019-05-02 14:07:05 [scrapy] INFO: Spider opened
2019-05-02 14:07:05 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2019-05-02 14:07:05 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6024
2019-05-02 14:07:06 [scrapy] DEBUG: Crawled (200) <GET https://www.riddles.com/robots.txt> (referer: None)
2019-05-02 14:07:07 [scrapy] DEBUG: Crawled (200) <GET https://www.riddles.com/jokes-and-riddles> (referer: None)
2019-05-02 14:07:07 [scrapy] ERROR: Spider error processing <GET https://www.riddles.com/jokes-and-riddles> (referer: None)
Traceback (most recent call last):
  File "C:\Users\Naked\Anaconda3\envs\scrapper\lib\site-packages\twisted\internet\defer.py",
line 651, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "C:\Users\Naked\Anaconda3\envs\scrapper\lib\site-packages\scrapy\spiders\__init__.py", line 76, in parse
    raise NotImplementedError
NotImplementedError
2019-05-02 14:07:07 [scrapy] INFO: Closing spider (finished)
2019-05-02 14:07:07 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 453,
 'downloader/request_count': 2,
 'downloader/request_method_count/GET': 2,
 'downloader/response_bytes': 32139,
 'downloader/response_count': 2,
 'downloader/response_status_count/200': 2,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2019, 5, 2, 11, 7, 7, 302220),
 'log_count/DEBUG': 3,
 'log_count/ERROR': 1,
 'log_count/INFO': 7,
 'response_received_count': 2,
 'scheduler/dequeued': 1,
 'scheduler/dequeued/memory': 1,
 'scheduler/enqueued': 1,
 'scheduler/enqueued/memory': 1,
 'spider_exceptions/NotImplementedError': 1,
 'start_time': datetime.datetime(2019, 5, 2, 11, 7, 5, 824498)}
2019-05-02 14:07:07 [scrapy] INFO: Spider closed (finished)

很抱歉，有很多代码，只是想解释一切。

Answer 1

您确定粘贴在此处的蜘蛛代码是否缩进了吗？因为如果不是，那是您的错误所在。

Python使用缩进来分隔类或函数的范围，在您的代码中parse方法不在类Spider的范围内。

如果您熟悉其他语言，则相当于这样做：

class Example {
}

function parse {
}

代替

class Example {
    function parse {
    }
}

如果您看到ERROR日志，则可以找出正在发生的事情：

文件   “ C：\ Users \ Naked \ Anaconda3 \ envs \ scrapper \ lib \ site-packages \ scrapy \ spiders__init __。py”，   第76行，处于解析状态

引发NotImplementedError

不是最好的错误消息，因为它指向项目外的文件，但会提示您。

所以解决方案是像这样缩进代码：

class BookSpiderSpider(scrapy.Spider):
    name = "book_spider"
    start_urls = (
        'https://www.riddles.com/jokes-and-riddles',
    )

    def parse(self, response) :
        items = BookItem()

        title_name = response.css('span.hidden-print::text').extract()

        items['title_name'] = title_name

        yield items

Answer 2

检查给定的代码，css还会为每个谜语返回“谜语”作为标题。还记得添加allowed_domains并使用[]

import scrapy
from ..items import BookItem


class BookSpiderSpider(scrapy.Spider):
    name = 'book_spider'
    allowed_domains = ['www.riddles.com']
    start_urls = ['https://www.riddles.com/jokes-and-riddles']


    def parse(self, response) :
        items = BookItem()

        title_name = response.xpath('//blockquote[@class="orange_dk_blockquote hidden-print"]/p/text()').extract()

        items['title_name'] = title_name

        yield items

控制台不导出任何已抓取的数据

2 个答案: