python - 控制台不导出任何抓取的数据

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 工作正常并提取“Riddle”单词。但是，当尝试在 Visual Studio 中运行 spy 程序时，它会加载所有内容并运行，但不会导出任何数据。

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

(scraper) 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\scraper\lib\site-packages\twisted\internet\defer.py",
line 651, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "C:\Users\Naked\Anaconda3\envs\scraper\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)

抱歉，代码太多，只是想解释一切。

Answer 1

您确定粘贴在这里的蜘蛛代码缩进良好吗？因为如果不是，那就是你的错误所在。

Python 使用缩进来分隔类或函数的范围，在您的代码中，parse 方法超出了类蜘蛛的范围。

如果您熟悉其他语言，则相当于执行以下操作:

class Example {
}

function parse {
}

而不是

class Example {
    function parse {
    }
}

如果您看到 ERROR 日志，您可以了解发生了什么:

File"C:\Users\Naked\Anaconda3\envs\scraper\lib\site-packages\scrapy\spiders_init_.py",line 76, in parse

raise NotImplementedError

这不是最好的错误消息，因为它指向项目外部的文件，但会给您一个提示。

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