python web crawler 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]

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

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

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

First, the problem to be solvedThe solution is to automatically search for Google academics based on a custom keyword, parse the search page, and download a PDF link to all the corresponding papers. Here we use Python to implement,Ii. Getting started with PythonPython auto indent: shift+table the whole block to the left, and the table to the right, which is useful when modifying the entire block of code, su

XMLHttpRequest object: Properties Description onReadyStateChange The function (or function name) is called whenever the ReadyState property is changed. ReadyState The state of being xmlhttprequest. Vary from 0 to 4. 0: Request uninitialized; 1: Server connection established; 2: Request received; 3: request processing; 4: Request completed and response ready Status : "OK"; 404: Page Not Found

, */* ',' 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

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

I. Preparations To complete a web crawler applet, you need to prepare the following: 1. Understand basic HTTP protocols 2. Familiar with urllib2 library interface 3. Familiar with Python Regular Expressions Ii. Programming ideas Here is just a basic web crawler program. Its

shows how to create a Post object and set the corresponding request parameters. Listing 2 Postmethod Postmethod = new Postmethod ("http://dict.cn/"); Htmlparser Basic Class Library use Htmlparser provides a powerful class library to handle Web pages on the Internet, which enables you to extract and modify specific content on a Web page. Here are a few examples to illustrate some of the uses

Learn the next Python, read a simple web crawler:http://www.cnblogs.com/fnng/p/3576154.htmlSelf-realization of a simple web crawler, to obtain the latest information on the film.The crawler mainly obtains the page, then parses the page, parses the information needed for furt

This question has just been queried on the Internet, summarized below. The main development language of reptiles is Java, Python, C + +For the general information collection needs, the different languages are not very different.C, C + +Search engine without exception to the use of c\c++ development crawler, guess the search engine crawler to collect a large numb

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

reImport QueueImport Threadsif __name__ = = ' __main__ ':Html_url = Raw_input (' Enter the URL: ')Html_page = Threads.download_page (Html_url)Max_page = 0title = ' 'If Html_page is not None:Search_title = Re.search (R ' title = Search_title.groupdict () [' title ']Search_page = Re.findall (R ' For Page_number in Search_page:page_number = Int (page_number)If Page_number > Max_page:Max_page = Page_numberprint ' title:%s '% titleprint ' max page number:%s '% max_pageStart_page = 0While Start_page