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Scrapy 教程示例

[英]Scrapy Tutorial Example

 原文  2016-08-31 07:12:44  4   2    python/ web-scraping/ scrapy/ web-crawler

問題描述

看看是否有人可以指出關於在 python 中使用 Scrapy 的正確方向。

幾天來我一直在嘗試按照示例進行操作，但仍然無法獲得預期的輸出。 使用了 Scrapy 教程http://doc.scrapy.org/en/latest/intro/tutorial.html#defining-our-item ，甚至從 github repo 下載了一個確切的項目，但我得到的輸出不是那個在教程中描述。

from scrapy.spiders import Spider
from scrapy.selector import Selector

from dirbot.items import Website


class DmozSpider(Spider):
name = "dmoz"
allowed_domains = ["dmoz.org"]
start_urls = [
    "http://www.dmoz.org/Computers/Programming/Languages/Python/Books/",
    "http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/",
]

  def parse(self, response):
    """
    The lines below is a spider contract. For more info see:
    http://doc.scrapy.org/en/latest/topics/contracts.html

    @url http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/
    @scrapes name
    """
    sel = Selector(response)
    sites = sel.xpath('//ul[@class="directory-url"]/li')
    items = []

    for site in sites:
        item = Website()
        item['name'] = site.xpath('a/text()').extract()
        item['url'] = site.xpath('a/@href').extract()
        item['description'] = site.xpath('text()').re('-\s[^\n]*\\r')
        items.append(item)

    return items

從 github 下載項目后，我在頂級目錄運行“scrapy crawl dmoz”。 我得到以下輸出：

2016-08-31 00:08:19 [scrapy] INFO: Scrapy 1.1.1 started (bot: scrapybot)
2016-08-31 00:08:19 [scrapy] INFO: Overridden settings: {'DEFAULT_ITEM_CLASS': 'dirbot.items.Website', 'NEWSPIDER_MODULE': 'dirbot.spiders', 'SPIDER_MODULES': ['dirbot.spiders']}
2016-08-31 00:08:19 [scrapy] INFO: Enabled extensions:
['scrapy.extensions.logstats.LogStats',
 'scrapy.extensions.telnet.TelnetConsole',
 'scrapy.extensions.corestats.CoreStats']
2016-08-31 00:08:19 [scrapy] INFO: Enabled downloader middlewares:
['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']
2016-08-31 00:08:19 [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']
2016-08-31 00:08:19 [scrapy] INFO: Enabled item pipelines:
['dirbot.pipelines.FilterWordsPipeline']
2016-08-31 00:08:19 [scrapy] INFO: Spider opened
2016-08-31 00:08:19 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2016-08-31 00:08:19 [scrapy] DEBUG: Telnet console listening on 128.1.2.1:2700
2016-08-31 00:08:20 [scrapy] DEBUG: Crawled (200) <GET http://www.dmoz.org/Computers/Programming/Languages/Python/Books/> (referer: None)
2016-08-31 00:08:20 [scrapy] DEBUG: Crawled (200) <GET http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/> (referer: None)
2016-08-31 00:08:20 [scrapy] INFO: Closing spider (finished)
2016-08-31 00:08:20 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 514,
 'downloader/request_count': 2,
 'downloader/request_method_count/GET': 2,
 'downloader/response_bytes': 16179,
 'downloader/response_count': 2,
 'downloader/response_status_count/200': 2,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2016, 8, 31, 7, 8, 20, 314625),
 'log_count/DEBUG': 3,
 'log_count/INFO': 7,
 'response_received_count': 2,
 'scheduler/dequeued': 2,
 'scheduler/dequeued/memory': 2,
 'scheduler/enqueued': 2,
 'scheduler/enqueued/memory': 2,
 'start_time': datetime.datetime(2016, 8, 31, 7, 8, 19, 882944)}
2016-08-31 00:08:20 [scrapy] INFO: Spider closed (finished)

根據教程期待這個：

[scrapy] DEBUG: Scraped from <200 http://www.dmoz.org/Computers/Programming/Languages/Python/Books/>
 {'desc': [u' - By David Mertz; Addison Wesley. Book in progress, full text, ASCII format. Asks for feedback. [author website, Gnosis Software, Inc.\n],
  'link': [u'http://gnosis.cx/TPiP/'],
  'title': [u'Text Processing in Python']}
[scrapy] DEBUG: Scraped from <200 http://www.dmoz.org/Computers/Programming/Languages/Python/Books/>
 {'desc': [u' - By Sean McGrath; Prentice Hall PTR, 2000, ISBN 0130211192, has CD-ROM. Methods to build XML applications fast, Python tutorial, DOM and SAX, new Pyxie open source XML processing library. [Prentice Hall PTR]\n'],
  'link': [u'http://www.informit.com/store/product.aspx?isbn=0130211192'],
  'title': [u'XML Processing with Python']}

2 個解決方案

解決方案1
 2 已采納  2016-08-31 07:34:58

似乎這個蜘蛛在教程中已經過時了。 該網站發生了一些變化，因此現在所有的 xpath 都沒有捕捉到任何東西。 這很容易修復：

def parse(self, response):
    sites = response.xpath('//div[@class="title-and-desc"]/a')
    for site in sites:
        item = dict()
        item['name'] = site.xpath("text()").extract_first() 
        item['url'] = site.xpath("@href").extract_first() 
        item['description'] = site.xpath("following-sibling::div/text()").extract_first('').strip()
        yield item

為了將來參考，您始終可以測試特定的 xpath 是否適用於scrapy shell命令。
例如我做了什么來測試這個：

$ scrapy shell "http://www.dmoz.org/Computers/Programming/Languages/Python/Books/"
# test sites xpath
response.xpath('//ul[@class="directory-url"]/li') 
[]
# ok it doesn't work, check out page in web browser
view(response)
# find correct xpath and test that:
response.xpath('//div[@class="title-and-desc"]/a')
# 21 result nodes printed
# it works!

解決方案2
 1  2017-02-24 01:45:33

這是從 DMOZ 中提取細節的 Scrapy 代碼的更正：

import scrapy

class MozSpider(scrapy.Spider):
name = "moz"
allowed_domains = ["www.dmoz.org"]
start_urls = ['http://www.dmoz.org/Computers/Programming/Languages/Python/Books/',
'http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/']

    def parse(self, response):
        sites = response.xpath('//div[@class="title-and-desc"]')
        for site in sites:
            name = site.xpath('a/div[@class="site-title"]/text()').extract_first()
            url = site.xpath('a/@href').extract_first()
            description = site.xpath('div[@class="site-descr "]/text()').extract_first().strip()
        
            yield{'Name':name, 'URL':url, 'Description':description}

要將其導出為 CSV，請在終端/CMD 中打開 spider 文件夾並輸入： 
import scrapy

class YlpSpider(scrapy.Spider):
name = "ylp"
allowed_domains = ["www.yellowpages.com"]
start_urls = ['http://www.yellowpages.com/search?search_terms=Translation&geo_location_terms=Virginia+Beach%2C+VA']


    def parse(self, response):
        companies = response.xpath('//*[@class="info"]')
        
        for company in companies:
            name = company.xpath('h3/a/span[@itemprop="name"]/text()').extract_first()
            phone = company.xpath('div/div[@class="phones phone primary"]/text()').extract_first()
            website = company.xpath('div/div[@class="links"]/a/@href').extract_first()
            
            yield{'Name':name,'Phone':phone, 'Website':website}



這是另一個基本的 Scrapy 教程：從黃頁中提取公司詳細信息：

scrapy crawl ylp -o result.csv

要將其導出為 CSV，請在終端/CMD 中打開 spider 文件夾並輸入： 
scrapy crawl yelp -o result.csv



此 Scrapy 代碼用於從 Yelp 中提取公司詳細信息：

 import scrapy class YlpSpider(scrapy.Spider): name = "yelp" allowed_domains = ["www.yelp.com"] start_urls = ['https://www.yelp.com/search?find_desc=Java+Developer&find_loc=Denver,+CO'] def parse(self, response): companies = response.xpath('//*[@class="biz-listing-large"]') for company in companies: name = company.xpath('.//span[@class="indexed-biz-name"]/a/span/text()').extract_first() address1 = company.xpath('.//address/text()').extract_first('').strip() address2 = company.xpath('.//address/text()[2]').extract_first('').strip() # '' means the default attribute if not found to avoid adding None. address = address1 + " - " + address2 phone = company.xpath('.//*[@class="biz-phone"]/text()').extract_first().strip() website = "https://www.yelp.com" + company.xpath('.//@href').extract_first() yield{'Name':name, 'Address':address, 'Phone':phone, 'Website':website}

要將其導出為 CSV，請在終端/CMD 中打開 spider 文件夾並輸入： 
 scrapy crawl yelp -o result.csv

解決方案3
 0  2021-06-03 18:59:31

想看看是否有人可以指出我在 python 中使用 Scrapy 的正確方向。

我已經嘗試遵循該示例幾天了，但仍然無法獲得預期的輸出。 使用了 Scrapy 教程http://doc.scrapy.org/en/latest/intro/tutorial.html#defining-our-item ，甚至從 github repo 下載了一個確切的項目，但我得到的輸出不是那個教程中描述。

from scrapy.spiders import Spider
from scrapy.selector import Selector

from dirbot.items import Website


class DmozSpider(Spider):
name = "dmoz"
allowed_domains = ["dmoz.org"]
start_urls = [
    "http://www.dmoz.org/Computers/Programming/Languages/Python/Books/",
    "http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/",
]

  def parse(self, response):
    """
    The lines below is a spider contract. For more info see:
    http://doc.scrapy.org/en/latest/topics/contracts.html

    @url http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/
    @scrapes name
    """
    sel = Selector(response)
    sites = sel.xpath('//ul[@class="directory-url"]/li')
    items = []

    for site in sites:
        item = Website()
        item['name'] = site.xpath('a/text()').extract()
        item['url'] = site.xpath('a/@href').extract()
        item['description'] = site.xpath('text()').re('-\s[^\n]*\\r')
        items.append(item)

    return items

從github下載項目后，我在頂級目錄運行“scrapy crawl dmoz”。 我得到以下輸出：

2016-08-31 00:08:19 [scrapy] INFO: Scrapy 1.1.1 started (bot: scrapybot)
2016-08-31 00:08:19 [scrapy] INFO: Overridden settings: {'DEFAULT_ITEM_CLASS': 'dirbot.items.Website', 'NEWSPIDER_MODULE': 'dirbot.spiders', 'SPIDER_MODULES': ['dirbot.spiders']}
2016-08-31 00:08:19 [scrapy] INFO: Enabled extensions:
['scrapy.extensions.logstats.LogStats',
 'scrapy.extensions.telnet.TelnetConsole',
 'scrapy.extensions.corestats.CoreStats']
2016-08-31 00:08:19 [scrapy] INFO: Enabled downloader middlewares:
['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']
2016-08-31 00:08:19 [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']
2016-08-31 00:08:19 [scrapy] INFO: Enabled item pipelines:
['dirbot.pipelines.FilterWordsPipeline']
2016-08-31 00:08:19 [scrapy] INFO: Spider opened
2016-08-31 00:08:19 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2016-08-31 00:08:19 [scrapy] DEBUG: Telnet console listening on 128.1.2.1:2700
2016-08-31 00:08:20 [scrapy] DEBUG: Crawled (200) <GET http://www.dmoz.org/Computers/Programming/Languages/Python/Books/> (referer: None)
2016-08-31 00:08:20 [scrapy] DEBUG: Crawled (200) <GET http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/> (referer: None)
2016-08-31 00:08:20 [scrapy] INFO: Closing spider (finished)
2016-08-31 00:08:20 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 514,
 'downloader/request_count': 2,
 'downloader/request_method_count/GET': 2,
 'downloader/response_bytes': 16179,
 'downloader/response_count': 2,
 'downloader/response_status_count/200': 2,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2016, 8, 31, 7, 8, 20, 314625),
 'log_count/DEBUG': 3,
 'log_count/INFO': 7,
 'response_received_count': 2,
 'scheduler/dequeued': 2,
 'scheduler/dequeued/memory': 2,
 'scheduler/enqueued': 2,
 'scheduler/enqueued/memory': 2,
 'start_time': datetime.datetime(2016, 8, 31, 7, 8, 19, 882944)}
2016-08-31 00:08:20 [scrapy] INFO: Spider closed (finished)

按照教程期待這個：

[scrapy] DEBUG: Scraped from <200 http://www.dmoz.org/Computers/Programming/Languages/Python/Books/>
 {'desc': [u' - By David Mertz; Addison Wesley. Book in progress, full text, ASCII format. Asks for feedback. [author website, Gnosis Software, Inc.\n],
  'link': [u'http://gnosis.cx/TPiP/'],
  'title': [u'Text Processing in Python']}
[scrapy] DEBUG: Scraped from <200 http://www.dmoz.org/Computers/Programming/Languages/Python/Books/>
 {'desc': [u' - By Sean McGrath; Prentice Hall PTR, 2000, ISBN 0130211192, has CD-ROM. Methods to build XML applications fast, Python tutorial, DOM and SAX, new Pyxie open source XML processing library. [Prentice Hall PTR]\n'],
  'link': [u'http://www.informit.com/store/product.aspx?isbn=0130211192'],
  'title': [u'XML Processing with Python']}

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