blocks|key|1656634|text|我用过Ruya，发现它很好用。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1656635|entityMap|0|LINK|mutability|MUTABLE|url|http://ruya.sourceforge.net/^0|3|4|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I've used <a href="http://ruya.sourceforge.net/" rel="nofollow noreferrer">Ruya</a> and found it pretty good.

blocks|key|1442031|text|查看HarvestMan，这是一个用Python语言编写的多线程网络爬虫，同时也查看了spider.py模块。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1442032|和here你可以找到构建一个简单网络爬虫的代码样本。|1442033|entityMap|0|LINK|mutability|MUTABLE|url|http://bulba.sdsu.edu/docwiki/HarvestMan|1|http://pypi.python.org/pypi/spider.py/0.5|2|http://www.example-code.com/python/pythonspider.asp^0|2|A|0|17|9|1|0|1|4|2|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]|$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|F|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]|P|$5|I|J|K|C|$L|Q]]]]

Check the <a href="http://bulba.sdsu.edu/docwiki/HarvestMan" rel="noreferrer">HarvestMan</a>, a multi-threaded web-crawler written in Python, also give a look to the <a href="http://pypi.python.org/pypi/spider.py/0.5" rel="noreferrer">spider.py</a> module.

And <a href="http://www.example-code.com/python/pythonspider.asp" rel="noreferrer">here</a> you can find code samples to build a simple web-crawler.

blocks|key|1656805|text|另一个simple+spider使用BeautifulSoup和urllib2。没有什么太复杂的东西，只是读取所有的href构建一个列表并遍历它。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1656806|entityMap|0|LINK|mutability|MUTABLE|url|http://www.grenadepod.com/2009/12/13/python-web-crawler/^0|3|D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Another <a href="http://www.grenadepod.com/2009/12/13/python-web-crawler/" rel="nofollow noreferrer">simple spider</a> 
Uses BeautifulSoup and urllib2. Nothing too sophisticated, just reads all a href's builds a list and goes though it.

blocks|key|1656820|text|pyspider.py|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1656821|entityMap|0|LINK|mutability|MUTABLE|url|http://bauerdata.bauerhost.dk/python-program-eksempler/pyspider^0|0|B|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<a href="http://bauerdata.bauerhost.dk/python-program-eksempler/pyspider" rel="nofollow noreferrer">pyspider.py</a>

blocks|key|1442193|text|我修改了上面的脚本，在访问drupal站点时需要包含一个登录页面。不是很漂亮，但可能会帮助到某个人。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1442194|#!/usr/bin/python

import+httplib2
import+urllib
import+urllib2
from+cookielib+import+CookieJar
import+sys
import+re
from+HTMLParser+import+HTMLParser

class+miniHTMLParser(+HTMLParser+):

++viewedQueue+=+[]
++instQueue+=+[]
++headers+=+{}
++opener+=+""

++def+get_next_link(+self+):
++++if+self.instQueue+==+[]:
++++++return+''
++++else:
++++++return+self.instQueue.pop(0)


++def+gethtmlfile(+self,+site,+page+):
++++try:
++++++++url+=+'http://'%2Bsite%2B''%2Bpage
++++++++response+=+self.opener.open(url)
++++++++return+response.read()
++++except+Exception,+err:
++++++++print+"+Error+retrieving:+"%2Bpage
++++++++sys.stderr.write('ERROR:+%25s\n'+%25+str(err))
++++return+""+

++++return+resppage

++def+loginSite(+self,+site_url+):
++++try:
++++cj+=+CookieJar()
++++self.opener+=+urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))

++++url+=+'http://'%2Bsite_url+
++++++++params+=+{'name':+'customer_admin',+'pass':+'customer_admin123',+'opt':+'Log+in',+'form_build_id':+'form-3560fb42948a06b01d063de48aa216ab',+'form_id':'user_login_block'}
++++user_agent+=+'Mozilla/4.0+(compatible;+MSIE+5.5;+Windows+NT)'
++++self.headers+=+{+'User-Agent'+:+user_agent+}

++++data+=+urllib.urlencode(params)
++++response+=+self.opener.open(url,+data)
++++print+"Logged+in"
++++return+response.read()+

++++except+Exception,+err:
++++print+"+Error+logging+in"
++++sys.stderr.write('ERROR:+%25s\n'+%25+str(err))

++++return+1

++def+handle_starttag(+self,+tag,+attrs+):
++++if+tag+==+'a':
++++++newstr+=+str(attrs[0][1])
++++++print+newstr
++++++if+re.search('http',+newstr)+==+None:
++++++++if+re.search('mailto',+newstr)+==+None:
++++++++++if+re.search('#',+newstr)+==+None:
++++++++++++if+(newstr+in+self.viewedQueue)+==+False:
++++++++++++++print+"++adding",+newstr
++++++++++++++self.instQueue.append(+newstr+)
++++++++++++++self.viewedQueue.append(+newstr+)
++++++++++else:
++++++++++++print+"++ignoring",+newstr
++++++++else:
++++++++++print+"++ignoring",+newstr
++++++else:
++++++++print+"++ignoring",+newstr


def+main():

++if+len(sys.argv)!=3:
++++print+"usage+is+./minispider.py+site+link"
++++sys.exit(2)

++mySpider+=+miniHTMLParser()

++site+=+sys.argv[1]
++link+=+sys.argv[2]

++url_login_link+=+site%2B"/node?destination=node"
++print+"\nLogging+in",+url_login_link
++x+=+mySpider.loginSite(+url_login_link+)

++while+link+!=+'':

++++print+"\nChecking+link+",+link

++++#+Get+the+file+from+the+site+and+link
++++retfile+=+mySpider.gethtmlfile(+site,+link+)

++++#+Feed+the+file+into+the+HTML+parser
++++mySpider.feed(retfile)

++++#+Search+the+retfile+here

++++#+Get+the+next+link+in+level+traversal+order
++++link+=+mySpider.get_next_link()

++mySpider.close()

++print+"\ndone\n"

if+__name__+==+"__main__":
++main()|code-block|syntax|javascript|1442195|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I hacked the above script to include a login page as I needed it to access a drupal site. Not pretty but may help someone out there.

<pre><code>#!/usr/bin/python

import httplib2
import urllib
import urllib2
from cookielib import CookieJar
import sys
import re
from HTMLParser import HTMLParser

class miniHTMLParser( HTMLParser ):

 viewedQueue = []
 instQueue = []
 headers = {}
 opener = ""

 def get_next_link( self ):
 if self.instQueue == []:
 return ''
 else:
 return self.instQueue.pop(0)


 def gethtmlfile( self, site, page ):
 try:
 url = 'http://'+site+''+page
 response = self.opener.open(url)
 return response.read()
 except Exception, err:
 print " Error retrieving: "+page
 sys.stderr.write('ERROR: %s\n' % str(err))
 return "" 

 return resppage

 def loginSite( self, site_url ):
 try:
 cj = CookieJar()
 self.opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))

 url = 'http://'+site_url 
 params = {'name': 'customer_admin', 'pass': 'customer_admin123', 'opt': 'Log in', 'form_build_id': 'form-3560fb42948a06b01d063de48aa216ab', 'form_id':'user_login_block'}
 user_agent = 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)'
 self.headers = { 'User-Agent' : user_agent }

 data = urllib.urlencode(params)
 response = self.opener.open(url, data)
 print "Logged in"
 return response.read() 

 except Exception, err:
 print " Error logging in"
 sys.stderr.write('ERROR: %s\n' % str(err))

 return 1

 def handle_starttag( self, tag, attrs ):
 if tag == 'a':
 newstr = str(attrs[0][1])
 print newstr
 if re.search('http', newstr) == None:
 if re.search('mailto', newstr) == None:
 if re.search('#', newstr) == None:
 if (newstr in self.viewedQueue) == False:
 print " adding", newstr
 self.instQueue.append( newstr )
 self.viewedQueue.append( newstr )
 else:
 print " ignoring", newstr
 else:
 print " ignoring", newstr
 else:
 print " ignoring", newstr


def main():

 if len(sys.argv)!=3:
 print "usage is ./minispider.py site link"
 sys.exit(2)

 mySpider = miniHTMLParser()

 site = sys.argv[1]
 link = sys.argv[2]

 url_login_link = site+"/node?destination=node"
 print "\nLogging in", url_login_link
 x = mySpider.loginSite( url_login_link )

 while link != '':

 print "\nChecking link ", link

 # Get the file from the site and link
 retfile = mySpider.gethtmlfile( site, link )

 # Feed the file into the HTML parser
 mySpider.feed(retfile)

 # Search the retfile here

 # Get the next link in level traversal order
 link = mySpider.get_next_link()

 mySpider.close()

 print "\ndone\n"

if __name__ == "__main__":
 main()
</code></pre>

I'm half-tempted to write my own, but I don't really have enough time right now. I've seen the Wikipedia list of <a href="http://en.wikipedia.org/wiki/Web_crawler#Open-source_crawlers" rel="nofollow noreferrer">open source crawlers</a> but I'd prefer something written in Python. I realize that I could probably just use one of the tools on the Wikipedia page and wrap it in Python. I might end up doing that - if anyone has any advice about any of those tools, I'm open to hearing about them. I've used Heritrix via its web interface and I found it to be quite cumbersome. I definitely won't be using a browser API for my upcoming project.

Thanks in advance. Also, this is my first SO question!

Anyone know of a good Python based web crawler that I could use?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我不太想写我自己的，但是我现在真的没有足够的时间。我看过维基百科上的列表，但我更喜欢用Python语言写的东西。我意识到我可能只需要使用Wikipedia页面上的工具之一，并将其包装在Python中。我可能最终会这么做--如果任何人对这些工具有任何建议，我都乐于倾听。我通过Heritrix的web界面使用过它，我发现它...

问谁知道一个好的基于Python的网络爬虫，我可以使用？
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问谁知道一个好的基于Python的网络爬虫，我可以使用？
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