python web crawler source code

couldn\ ' t fulfill the request. ' Print ' Error code: ', E.code elif hasattr (E, ' reason '): Print ' We failed to reach a server. ' Print ' Reason: ', E.reason Else : Print ' No exception was raised. ' # everything is fine The above describes the [Python]

Reference: http://www.cnblogs.com/xin-xin/p/4297852.htmlFirst, IntroductionCrawler is a web crawler, if the Internet than to make a big net, then spiders are reptiles. If it encounters a resource, it will crawl down.Second, the processWhen we browse the Web page, we often see a variety of pages, in fact, this process is we enter the URL, the DNS resolution to the

Finally have the time to do with the Python knowledge learned to write a simple web crawler, this example is mainly implemented with Python crawler from the Baidu Gallery to download beautiful pictures, and saved in the local, gossip less, directly posted the corresponding

packet: 9. Processing of forms Login necessary forms, how to fill out the form? First, use the tool to intercept the content you want to fill in.For example, I usually use the Firefox+httpfox plugin to see what I sent the package.Take VERYCD as an example, first find your own post request, and the Post form item.Can see VERYCD words need to fill username,password,continueuri,fk,login_submit these items, where FK is randomly generated (actually not too random, it looks like the epoch time thro

I'm also looking at the Python version of the RCNN code, which comes with the practice of Python programming to write a small web crawler.The process of crawling a Web page is the same as when the reader usually uses Internet Explorer to browse the

Function Introduction: Use Selenium and Chrome browser, let it automatically open Baidu page, and set to show 50 per page, and then in Baidu Search box input selenium, to query. Then open the page and select "Selenium-Open source China community" and open the page Knowledge Brief: The role of Selenium: 1. Originally used for Web site automation testing, in recent years, to obtain accurate site snapshots. 2)

computer implementation will also have a certain difference. However, the relative difference between each method should be considerable. As you can see from the results,beautiful Soup is more than 7 times times slower than the other two methods when crawling our sample Web pages. In fact, this result is expected because lxml and regular expression modules are written in C , while beautiful Soup is written in pure

[Python Data Analysis] Python3 multi-thread concurrent web crawler-taking Douban library Top250 as an example, python3top250 Based on the work of the last two articles [Python Data Analysis] Python3 Excel operation-Take Douban library Top250 as an Example [Python Data Analys

If you want to develop a simple python crawler case and run it in a Python3 or above environment, what you need to know to complete a simple python What about reptiles? Crawler's architecture implementationcrawlers include scheduler, manager, parser, downloader, and output. The scheduler can understand the entry of the primary function as the head of the entire

, */* ',' Accept-language ': ' en-us,en;q=0.8,zh-hans-cn;q=0.5,zh-hans;q=0.3 ',' User-agent ': ' mozilla/5.0 (Windows NT 6.3; WOW64; trident/7.0; rv:11.0) Like Gecko ',' accept-encoding ': ' gzip, deflate ',' Host ': ' www.zhihu.com ',' DNT ': ' 1 '}url = ' http://www.zhihu.com/'Opener = Getopener (header)op = opener.open (URL)data = Op.read ()data = ungzip (data)# Unzip_XSRF = GETXSRF (Data.decode ())URL + = ' login 'id = ' Fill in your account number here 'Password = ' Fill in your password he

realized. 2. set Headers to http requests Some websites do not like to be accessed by programs (not manually accessed), or send different versions of content to different browsers. By default, urllib2 uses itself as "Python-urllib/x. y" (x and y are the main Python version and minor version, such as Python-urllib/2.7 ),This identity may confuse the site or sim

The Python write web crawler is a great guide to crawling Web data using Python, explaining how to crawl data from static pages and how to manage server load using caching. In addition, the book describes how to use AJAX URLs and Firebug extensions to crawl data, and more ab

Some time ago self-study of Python, as a novice thinking of writing something to be able to practice, understand Python to write a reptile script is very convenient, and recently learned MongoDB related knowledge, everything has only owe the East wind. The requirements of the program is this, the crawler crawling page is the Beijing-East ebook website page, will

Today this article mainly introduces the Python web crawler-about simple analog login, has a certain reference value, now share to everyone, the need for friends can refer to and access to the information on the Web page, you want to do a simulated login also need to send some information to the server, such as accoun

Don't say much nonsense, just say the point:At the beginning of the time, agent IP, head information pool, have been done, using SELENIUM+PHANTOMJS to get JS dynamic loading of the source codeAt first very good, can come out of the dynamic load after the source code, but after several runs, the computer a little lag (estimated that the storage is too small), the

===================== crawler principle =====================Access the news homepage via Python and get news leaderboard links with regular expressions.Access these links in turn, get the article information from the HTML code of the Web page, and save the information to the article object.The data in the article obje

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

Today, we have integrated a BFS crawler and HTML extraction. At present, the function still has limitations. Extract the body, see http://www.fuxiang90.me/2012/02/%E6%8A%BD%E5%8F%96html-%E6%AD%A3%E6%96%87/ Currently, only the URLs of the HTTP protocol are allowed to be crawled and tested only on the Intranet, because the connection to the Internet is not unpleasant. A global URL queue and URL set. The queue is for the convenience of BFS implementa

page information.1. Call the Urlopen method inside the URILLIB2 library, pass in a URL (ie, url), after executing the Urlopen method, return a response object, return the information is saved in here, through the response object's Read method, return to get to the Web page content , the code is as follows:1 Import Urllib2 2 3 response = Urllib2.urlopen ("http://www.cnblogs.com/mix88/")4 Print response.re

with the id attribute content_1. //* means that regardless of location, just follow the properties to meet. Then look down to the 7 span tab and find the label for a below. Then the result is a list. Represents all the elements found. Print out the content by traversing the list. The results of the operation are as follows: E:\python2.7.11\python.exe e:/py_prj/test.pySection 7As can be seen from the above, in fact, XPath is still very good to write, relative BeautifulSoup to the positioni