python web scraping library

Windows 64-bit operating system, crawling Web pages with Python and parsing pages with PyqueryPyquery is the implementation of jquery in Python, and it is very convenient to manipulate the parsing of HTML documents in the syntax of jquery. Need to install before use, Easy_install pyquery can, or Ubuntu underDetailed reference:http://blog.csdn.net/zhaoyl03/article

') Print "'. Join (time) m=Re.findall (Datepattern,page.text)ifLen (m):Pass Else: M=Re.findall (Datepattern2,page.text) forKinchm:date=re.sub (Subpattern_img,"", K) File.write (DATE) file.write ('\ n') Time.sleep (10) The crawl speed is not fast ... But to avoid being reversed, this is the only way.3. PostScriptPython is really getting interesting. Of course, in addition to using a variety of libraries to achieve interesting features, I do need to strength

Response = Requests.get ('http://www.baidu.com')Print(Response.status_code)# $Print(response.headers)#header information returned by the serverPrint(response.content)#raw data, byte typePrint(Response.content.decode ())#page source code has been transcodedPrint(Response.text)#Web page source code for transcoding iso-8859, Chinese garbled when the returned header information Content-type has charset attribute, #transcoding

1. Chop a webpage down in minutes How to grill Web pages? In fact, it is based on the URL to get its web page information, although we see in the browser is a beautiful picture, but in fact, is interpreted by the browser is presented, in essence it is a piece of HTML code, plus JS, CSS, if the page compared to a person, then HTML is his skeleton, JS is his muscle, CSS is its clothes. So the most important

knows how to open URLs through a specific protocol, or how to handle various aspects of the URL when it is opened. such as HTTP redirection or HTTP cookies.More information on openers and handlers. Http://www.voidspace.org.uk/python/articles/urllib2.shtml#openers-and-handlers2. URLLIB2 Usage Tips 2.1 Proxy IP creation openernote:currently urllib2 does not support fetching of HTTPS locations through a proxy. This can is a problem. http://www.voidspace

the server itself.Delete: Deletes a resource. This is mostly rare, but there are some places like Amazon's S3 cloud service that use this method to delete resources.If you want to use HTTP PUT and DELETE, you can only use the lower-level httplib library. Even so, we can make it possible for URLLIB2 to send a PUT or delete request in the following way, but the number of times it is used is really small, as mentioned here.Python 1234

(user_num)]Printlist[Int (user_num)]Printlist[Int (pass_num)]ifmode=='POP3': Checkpop3password (Mail_server,username,password)ifmode=='SMTP': Checksmtppassword (mail_server,username,password) each_line=F.readline ()if __name__=='__main__': Print 'mail_check.py nefu.txt pop.nefu.edu.cn user_num pass_num mode' Print 'mail_check.py nefu.txt pop.nefu.edu.cn 2 1 pop3/smtp'Open_check_password_user (sys.argv[1],sys.argv[2],sys.argv[3],sys.argv[4],sys.argv[5]) The company's busine

[Python crawler topic] Parsing Method What is Urllib: A python built-in HTTP request library mainly contains four modules: Urllib. request module: This module is used to simulate sending page requestsUrllib. error Exception Handling Module: ensures that the program will not be accidentally terminated due to running errors.Urllib. parse url parsing module: Used a

1. Crawl a webpage in minutesHow to crawl the page? In fact, it is based on the URL to obtain its web page information, although we see in the browser a beautiful picture, but in fact, it is interpreted by the browser to show, in essence it is a piece of HTML code, plus JS, CSS, if the page compared to a person, then HTML is his skeleton, JS is his muscle, CSS is his clothes. So the most important part is in the HTML, let's write an example to pick a

The basic use of the Python crawler's urllib libraryImport urllib2response = Urllib2.urlopen ("http://www.baidu.com") print Response.read ()In fact, the above Urlopen parameters can be passed to a request requests, it is actually a request class instance, constructs the need to pass in the Url,data and so on content. Like the two lines of code above, we can rewrite this.#-*-Coding:utf-8-*-"" "Created on Fri Apr 11:23:04 2017@author:zeze" "" Import url

Python Urllib library basic usage tutorial, pythonurllib 1. Pull a webpage in minutes How to obtain webpages? In fact, the webpage information is obtained based on the URL. Although we see a beautiful picture in the browser, it is actually presented by the browser, in essence, it is an HTML code, adding JS and CSS. If you compare a webpage to a person, HTML is his skeleton, JS is his muscle, and CSS is his

When using the requests library, there will be the situation of Chinese garbled Reference Code Analysis Python requests Library Chinese coding problem Python HTTP Library Requests Chinese page garbled solution. Analysis According to the two articles, The source code of the a

first save the HTML file, with a ready-made HTTP Server software, to receive user requests, from the file to read HTML, return.If you want to generate HTML dynamically, you need to implement the above steps yourself. However, accepting HTTP requests, parsing HTTP requests, and sending HTTP responses are all menial jobs, and if we're writing these underlying code ourselves, it's going to take months to read the HTTP specification before we start writing Dynamic HTML.The correct approach is that

Advanced usage of Python crawler urllib LibrarySet headersSome sites do not agree to the program directly in the way of access, if the identification of the problem, then the site will not respond, so in order to fully simulate the work of the browser, we need to set some headers properties.First of all, open our browser, debugging browser F12, I use Chrome, open the network monitoring, as shown below, such as a website, after the login, we will find

In today's web pages, image verification codes are one of the most common ways to prevent bots from submitting forms. Here is not detailed introduction, I believe we have met.Now give the code to implement the CAPTCHA image using Python's PiL library. Detailed comments are in the code.#!/usr/bin/env python#coding=utf-8import randomfrom PIL import Image, Imagedraw

One time PackageSleep ([float time]) delays a number of seconds in floating-point numbersThe time package is based on the C language library function (functions).Python's interpreter is generally written in C, and some Python functions also call the C-language library function directly.Time.time () Get current time, return float type, Unit: secTime.clock () on UN

One time PackageSleep ([float time]) delays a number of seconds in floating-point numbersThe time package is based on the C language library function (functions).Python's interpreter is usually written in C, and some Python functions directly invoke the C-language library function.Time.time () Get current time, return float type, Unit: secTime.clock () on UNIX sy

This article describes how to use the pycurl Library in python to read web pages from a specified website. For more information, see the following example, share it with you for your reference. The code of this instance allows you to read web pages from a specified website, mainly using the pycurl

a contentTitle_contains Title contains a contentPresence_of_all_elements_located y element is loaded, passed in the locating tuple, as (by.id, ' P ')visibility_of element visible, incoming locator tupleText_to_be_present_in_element an element literal contains a literalText_to_be_present_in_element_value An element value contains a fileElement_to_be_clickable an element can be clickedWait a minute6 Browser forward and backwardBrowser.forward ()Browser.back ()7CookiesCookies can be viewed, added

servers written in python, and decouples web apps from web servers. 2. The independent WSGI server provided by the python standard library is called wsgiref #!/usr/bin/env python# -*- coding:utf-8 -*-#-Author-Lianfrom wsgiref.sim