python web crawler code

Like climbing baidu.com, which should be written in Python 3.4.Error tip 1:print "Hello" syntaxerror:missing parentheses in call to ' print 'The syntax for print is different in 2 and 3 .print ("Hello") in Python 3print "Hello" in Python 2Error Tip 2:No module named ' Urllib2 'python3.3 inside, replace URLLIB2 with Urllib.requestReference Official Document HTTPS:

) #---------5 seconds after the next stepReq3=urllib.urlopen ()Always multiple simple page crawls with 5 second intervals in the middleImport Urllib,urllib2url = ' Https://api.douban.com/v2/book/user/ahbei/collections 'data={' status ': ' read ', ' rating ': 3, ' tag ': ' Novel '}Data=urllib.urlencode (data)Req=urllib2. Request (Url,data)Res=urllib2.urlopen (req)Print Res.read ()This is a standard post request, but due to multiple visits to the site, it is easy for IP to be blockedImport Urllib,

When I was bored last night, I tried to practice python, so I wrote a little reptile to get a knife. Update data in the entertainment network[Python]View PlainCopy #!/usr/bin/python # Coding:utf-8 Import Urllib.request Import re #定义一个获取网页源码的子程序 Head = "www.xiaodao.la" Def get (): data = Urllib.request.urlopen (' http://www.xiaodao.la '). Read

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[Python] web crawler (4): Opener, Handler, and openerhandler Before proceeding, let's first explain the two methods in urllib2: info and geturl.The response object response (or HTTPError instance) returned by urlopen has two useful methods: info () and geturl () 1. geturl (): Geturl () returns the obtained real URL, which is useful because urlopen (or the opener

This article mainly introduces the simple crawling of the python girl chart. The example analyzes the page source code acquisition, progress display, regular expression matching, and other skills involved in the Python crawler program, for more information about how to implement simple crawling, see the example in this

This article describes in detail how to solve the garbled problem of Python web crawlers, which has some reference value, interested friends can refer to this article to introduce in detail how to solve the garbled problem of Python web crawlers, which has some reference value. interested friends can refer There are m

The requests Library is an HTTP client written in Python . Requests Cubby urlopen more convenient. Can save a lot of intermediate processing process, so that directly crawl Web data. Take a look at specific examples: defRequest_function_try ():headers={' User-agent ':' mozilla/5.0 (Windows NT 10.0; WOW64; rv:44.0) gecko/20100101 firefox/44.0 '}R=requests.get (Url="Http://www.baidu.com",Headers=headers)pri

Python3x, we can get the content of the Web page in two ways Get address: National Geographic Chinese Network url = ' http://www.ngchina.com.cn/travel/' Urllib Library 1, guide warehousing From Urllib Import Request 2, get the content of the Web page With Request.urlopen (URL) as file: data = File.read () print (data) Run found an error: Urllib.error.HTTPError:HTTP Error 403:forbidden Mainly bec

also set multiple parameter lookups, such as finding the label for a formHtml.find_all (' form ',method="POST",target="_blank" ) ):A.encode (' GBK ')Of course, in the search can also use regular expressions, such as Re.complie ("a.*") and other methodsYou can also limit the number of lookups: The following expression is the first 5 search resultsHtml.find_all (' A ', limit=5):a.attrs[' class ']The Find family also has find_parents/find_parent to locate the parent node. find_next_siblings ()/fin

Weekend nothing to write a web crawler, first introduced its function, this is a small program, mainly used to crawl pages of articles, blogs, etc., first find the article you want to crawl, such as Han's Sina blog, into his article directory, write down the directory connection such as HTTP/ Blog.sina.com.cn/s/articlelist_1191258123_0_1.html, there is a connection in each article, all we need to do now is

://www.csdn.net/'}start_urls=["http://www.csdn.net/"]Reload (SYS)Sys.setdefaultencoding (' Utf-8 ')Type = Sys.getfilesystemencoding ()def start_requests (self):return [Request ("Http://passport.csdn.net/account/login", meta={' Cookiejar ': 1},callback=self.post_login,method= " POST ")]def post_login (self,response):Html=beautifulsoup (Response.text, "Html.parser")For input in Html.find_all (' input '):If ' name ' in Input.attrs and input.attrs[' name '] = = ' LT ':lt=input.attrs[' value ']If ' n

This article explains the example code for writing a Python crawler to crawl a GIF on a comic, with sample code Python3, using the Urllib module, request module, and BeautifulSoup module, and the friends you need can refer to This article is to introduce the crawler is to c

callsApplication/JSON: used for json rpc callsApplication/X-WWW-form-urlencoded: used when the browser submits a web formWhen using the restful or soap service provided by the server, the Content-Type setting error may cause the server to reject the service. 4. RedirectBy default, urllib2 automatically performs a redirect action on the HTTP 3xx return code, without manual configuration. To check whether

Python multi-thread crawler and multiple data storage methods (Python crawler practice 2), python Crawler1. multi-process Crawler For crawlers with a large amount of data, you can use a python