python web crawler tutorial

python3.x Crawler,Found the error "Unicodedecodeerror: ' Utf-8 ' codec can ' t decode byte 0x8b in position 1:invalid start byte", has been looking for file errors, finally after the user's tips, the cause of the error Then there is a message in my header:"' accept-encoding ': ' gzip, deflate '"This is the one I copied directly from Fiddler, why the browser can be normal browsing, and Python imitation can n

Version number: Python2.7.5,python3 changes are large, you find another tutorial. The so-called Web crawl, is the URL address specified in the network resources from the network stream read out, save to Local.Similar to the use of the program to simulate the function of IE browser, the URL as the content of the HTTP request to the server side, and then read the server-side response resources. In

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

I think this article is very interesting, idle to see!Python crawler tutorial -28-selenium manipulating ChromePHANTOMJS Ghost Browser, no interface browser, no rendering page. Selenium + Phantomjs is a perfect match before. Later in 2017, Google announced that Chrome also announced support for non-rendering. So PHANTOMJS use more and less people, it is a pity, th

The crawler simply says it consists of two steps: Get the Web page text, filter the data. 　　 1. Get HTML text.Python is very handy for getting HTML, and just a few lines of code can do what we need. The code is as follows: def gethtml (URL):page = Urllib.urlopen (URL)html = Page.read ()Page.close ()return HTML Such a few lines of code believe that you can probably know what it means without annotations.

(title_list)): Title=Title_list[i].text.strip ()Print('the title of article%s is:%s'% (i+1, title))Find_all Find all results, the result is a list. Use a loop to list the headings. Parser How to use Advantages Disadvantage Python Standard library BeautifulSoup (markup, "Html.parser") Python's built-in standard library Moderate execution speed

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Version number: Python2.7.5,python3 changes larger, you find another tutorial. The so-called web crawl, is the URL address specified in the network resources from the network stream to read out, save to the local.Similar to using the program to simulate the function of IE browser, the URL is sent as the content of the HTTP request to the server side, and then read the server-side response resources. In

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

The simple introduction to urllib2 is mentioned earlier. The following describes how to use urllib2. 1. Proxy Settings By default, urllib2 uses the environment variable http_proxy to set HTTP proxy. If you want to explicitly control the proxy in the program without being affected by environment variables, you can use the proxy. Create test14 to implement a simple proxy Demo: import urllib2enable_proxy = Trueproxy_handler = urllib2.ProxyHandler({"http" : 'http://some-proxy.com:8080'})null_proxy

,i,path): If not os.path.exists (path):Os.makedirs (PATH)File_path = path +'/' +STR (i) +'. txt 'f =Open (File_path,' W ') For itemIn items: if __name__ = =' __main__ ':item_new= item.Replace‘\ n‘,‘‘).Replace' ‘\ n‘).Replace' ‘‘).Replace' ‘‘).Replace' ‘\ n‘).Replace' ‘\ n‘)F.write (item_new)F.close () def run (Self): Print Span style= "color: #000080; Font-weight:bold ">for i in range ( Span style= "COLOR: #0000ff" >1,35): content= self.get _page (i) items= self.analysis (content) Self.save

Pop:queue is empty 'returnNoneElse: returnSelf.queue.pop () def isEmpty (self):ifLen (self.queue) ==0: return1Else: return0def addtovisited (self,url): Self.visited.append (URL) def addtofailed (Self,url): Self.failed.appen D (URL) def remove (Self,url): Self.queue.remove (URL) def getvisitedcount (self):returnLen (self.visited) def getqueuecount (self):returnLen (self.queue) def addlinks (self,links): forlink in links:self.push (link)if__name__== "__main__": Se

Description: Download pictures, regular expressions for tests onlyTest URL for Iron Man post An introduction to Mark's armor postsThe following code will download all the pictures of the first page to the root directory of the program#!/usr/bin/env python#!-*-coding:utf-8-*-ImportUrllib,urllib2ImportRe#返回网页源代码 def gethtml(URL):html = urllib2.urlopen (URL) srccode = Html.read ()returnSrccode def getimg(srccode): #通过分析网页中的图片地址, establish regular for

made some changes and wrote the title to the TXT file Import urllib.request Import re #使用正则表达式def getjpg (html): Jpglist = Re.findall (R ' (img src= "http.+?. JPG ") ([\s\s]*?) (.+?. alt= ". +?.") ', html) jpglist = Re.findall (R ' http.+?. JPG ', str (jpglist)) return jpglistdef downLoad (jpgurl,stitle,n): Try:urllib.request.urlretrieve (Jpgurl, ' C:/users/74172/source/repos/python/spidertest1/images/book.douban/%s.jpg '%stitl

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

(to_list,subject,content):Me= "Hello" + "msg = Mimetext (content,_subtype= ' plain ', _charset= ' utf-8 ')msg[' Subject '] = SubjectMsg[' from '] = MeMsg[' to '] = ";". Join (To_list)TryServer = Smtplib. SMTP ()Server.connect (Mail_host)Server.login (MAIL_USER,MAIL_PWD)Server.sendmail (Me, To_list, msg.as_string ())Server.close ()Return TrueExcept Exception as E:Print (str (e))Return Falsedef tag (Url,key):I=1While 1:Tryr = Requests.get (URL)Cont =r._content.decode (' Utf-8 ')Except Exception a

Since python2.x and python3.x are very different, python2.x calls urllib with instruction Urllib.urlopen (),Run times wrong: Attributeerror:module ' urllib ' has no attribute ' Urlopen 'The reason is that urllib.request should be used in python3.x.After the download page is successful, call the Webbrowsser module and enter the instruction Webbrowsser. Open_new_tab (' baidu.com.html ')TrueOpen (' baidu.com.html ', ' W '). Write (HTML)Writes the downloaded Web