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  3. Sitemi taramak ve URL'leri dışa aktarmak için Scrub ve xpath - ne yapıyorum?

Sitemi taramak ve URL'leri dışa aktarmak için Scrub ve xpath - ne yapıyorum?

2016-04-13 17 views
1

Web sitemi taramak ve sitemin tüm sayfa URL'lerini ayıklamak için temel bir Scrapy kurmaya çalışıyorum. Bunun oldukça kolay olacağını düşünürdüm.Sitemi taramak ve URL'leri dışa aktarmak için Scrub ve xpath - ne yapıyorum?

from scrapy.item import Item, Field 
class Website(Item): 
    name = Field() 
    description = Field() 
    url = Field()

İşte öğreticisindeki example.py adlı benim Örümcek verilmiştir:

İşte öğretici kopyalanmış benim items.py, bu. Ben bot dan karşılığında elde ne

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

from cspenn.items import Website 


class DmozSpider(Spider): 
    name = "cspenn" 
    allowed_domains = ["christopherspenn.com"] 
    start_urls = ["http://www.christopherspenn.com/"] 

    def parse(self, response): 

     sel = Selector(response) 
     sites = sel.xpath('//a') 
     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

: Ben yanlış yapıyorum

scrapy crawl cspenn 
2016-04-13 13:15:25 [scrapy] INFO: Scrapy 1.0.5 started (bot: cspenn) 
2016-04-13 13:15:25 [scrapy] INFO: Optional features available: ssl, http11, boto 
2016-04-13 13:15:25 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'cspenn.spiders', 'SPIDER_MODULES': ['cspenn.spiders'], 'BOT_NAME': 'cspenn'} 
2016-04-13 13:15:25 [scrapy] INFO: Enabled extensions: CloseSpider, TelnetConsole, LogStats, CoreStats, SpiderState 
2016-04-13 13:15:26 [boto] DEBUG: Retrieving credentials from metadata server. 
2016-04-13 13:15:27 [boto] ERROR: Caught exception reading instance data 
Traceback (most recent call last): 
    File "/usr/lib/python2.7/dist-packages/boto/utils.py", line 210, in retry_url 
    r = opener.open(req, timeout=timeout) 
    File "/usr/lib/python2.7/urllib2.py", line 431, in open 
    response = self._open(req, data) 
    File "/usr/lib/python2.7/urllib2.py", line 449, in _open 
    '_open', req) 
    File "/usr/lib/python2.7/urllib2.py", line 409, in _call_chain 
    result = func(*args) 
    File "/usr/lib/python2.7/urllib2.py", line 1227, in http_open 
    return self.do_open(httplib.HTTPConnection, req) 
    File "/usr/lib/python2.7/urllib2.py", line 1197, in do_open 
    raise URLError(err) 
URLError: <urlopen error timed out> 
2016-04-13 13:15:27 [boto] ERROR: Unable to read instance data, giving up 
2016-04-13 13:15:27 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats 
2016-04-13 13:15:27 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware 
2016-04-13 13:15:27 [scrapy] INFO: Enabled item pipelines: 
2016-04-13 13:15:27 [scrapy] INFO: Spider opened 
2016-04-13 13:15:27 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min) 
2016-04-13 13:15:27 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023 
2016-04-13 13:15:27 [scrapy] DEBUG: Crawled (200) <GET http://www.christopherspenn.com/> (referer: None) 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] DEBUG: Scraped from <200 http://www.christopherspenn.com/> 
{'description': [], 'name': [], 'url': []} 
2016-04-13 13:15:27 [scrapy] INFO: Closing spider (finished) 
2016-04-13 13:15:27 [scrapy] INFO: Dumping Scrapy stats: 
{'downloader/request_bytes': 222, 
'downloader/request_count': 1, 
'downloader/request_method_count/GET': 1, 
'downloader/response_bytes': 14302, 
'downloader/response_count': 1, 
'downloader/response_status_count/200': 1, 
'finish_reason': 'finished', 
'finish_time': datetime.datetime(2016, 4, 13, 17, 15, 27, 262789), 
'item_scraped_count': 93, 
'log_count/DEBUG': 96, 
'log_count/ERROR': 2, 
'log_count/INFO': 7, 
'response_received_count': 1, 
'scheduler/dequeued': 1, 
'scheduler/dequeued/memory': 1, 
'scheduler/enqueued': 1, 
'scheduler/enqueued/memory': 1, 
'start_time': datetime.datetime(2016, 4, 13, 17, 15, 27, 77084)} 
2016-04-13 13:15:27 [scrapy] INFO: Spider closed (finished)

? Öğreticiyi neredeyse tam olarak takip ettim. İstenen çıktı, bir CSV başlık dosyası, sayfa URL'si ve açıklamasıdır.

kaynak

2016-04-13 Christopher Penn

cevap

2

İçeriğe özgü xpath'leri doğru şekilde oluşturmuyorsunuz. siz de çıktıda boş açıklamaları beri, sanıyorum,

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

Ve: Zaten site değişkeni içinde, gerek döngü içinde XPath ifadelere a başa ekleyerek, bağlamda a var Normal ifadenin de düzeltilmesi gerekiyor. Bu, bağlantı metinlerinden tam olarak ne elde etmeye çalıştığınıza bağlıdır.

kaynak

2016-04-13 17:30:19 alecxe

+0

Temel olarak sitenin tüm URL'lerinin temiz bir şekilde dışa aktarılmasını arıyorum. Tüm siteyi tara ve tüm sayfa URL'lerini dışa aktar. Teşekkür ederim! –

+0

@ChristopherPenn tamam, adım adım yaklaşalım, şimdi hangi çıktıyı elde ediyorsunuz? Şimdi boş olmayan 'isim' ve 'url' görüyor musunuz? – alecxe

+0

Yaparım! { 'description': [], 'name': [u'Marketing Beyaz Bant '], 'url': [u'http: //www.christopherspenn.com/buy-the-marketing-white- kemer-kitap/']} –

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