python web crawler source code

Python static Web Crawler xpath (simple blog update reminder function), pythonxpath Directly run the Code: #! /Usr/bin/env python3 # antuor: Alan #-*-coding: UTF-8-*-import requestsfrom lxml import etreeimport datetime, timeimport osclass xxoohelper (object ): # Easy read def _ init _ (self): self. url = 'HTTP: // www.

Wrote a simple web crawler:#Coding=utf-8 fromBs4ImportBeautifulSoupImportRequestsurl="http://www.weather.com.cn/textFC/hb.shtml"defget_temperature (URL): Headers= { 'user-agent':'mozilla/5.0 (Windows NT 10.0; WOW64) applewebkit/537.36 (khtml, like Gecko) chrome/55.0.2883.87 safari/537.36', 'upgrade-insecure-requests':'1', 'Referer':'http://www.weather.com.cn/weather1d/10129160502A.shtml

1, Python web crawler to get Taobao commodity price code: #-*-coding:utf-8-*-' Created on March 17, 2017 @author: Lavi ' "Import requests from BS4 import BeautifulSoup import BS4 I Mport re def gethtmltext (URL): try:r = Requests.get (url,timeout=30) r.raise_for_status R.enco Ding = r.apparent_encoding return r.text e

beautifulsoup corresponds to the entire contents of a html/xml document.Beautiful Soup Library ParserSoup = beautifulsoup (' Data ', ' Html.parser ') Parser How to use conditions HTML parser for BS4 BeautifulSoup (MK, ' Html.parser ') Installing the BS4 Library HTML parser for lxml BeautifulSoup (MK, ' lxml ') Pip Install lxml XML parser for lxml BeautifulSoup (MK, ' xml ') Pip Install lxml

. The engine gets the first URL to crawl from the spider, and then dispatches it as a request in the schedule. The engine gets the page that crawls next from the dispatch. The schedule returns the next crawled URL to the engine, which the engine sends to the downloader via the download middleware. When the Web page is downloaded by the downloader, the response content is sent to the engine via the download middleware. The engine re

scrapy bench, will create a local server and will crawl at the maximum speed, again in order to test the performance of local hardware, to avoid the impact of too many factors, all only connected follow-up, not content processingPurely on the hardware performance, the display can crawl about 2,400 pages per minute, this is a reference standard, in the actual operation of crawler projects, due to various factors caused by different speed, in general,

=============== crawler principle ==================Access the website via python, get the HTML code of the website, and get the image address of SRC in the specific IMG tag via regular expression.Then access the image address and save the picture locally via IO.=============== script code ==================ImportUrlli

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

First, install the ScrapyImporting GPG keyssudo apt-key adv--keyserver hkp://keyserver.ubuntu.com:80--recv 627220E7Add a software sourceEcho ' Deb Http://archive.scrapy.org/ubuntu scrapy main ' | sudo tee/etc/apt/sources.list.d/scrapy.listUpdate the package list and install Scrapysudo apt-get update sudo apt-get install scrapy-0.22Ii. Composition of ScrapyThree, fast start scrapyAfter you run scrapy, you only need to rewrite a download.Here is someone else's example of crawling job site informa

Share--https://pan.baidu.com/s/1c3emfje Password: eew4Alternate address--https://pan.baidu.com/s/1htwp1ak Password: u45nContent IntroductionThis course is intended for students who have never been in touch with Python, starting with the most basic grammar and gradually moving into popular applications. The whole course is divided into two units of foundation and actual combat.The basic part includes Python

[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

for convenience, under Windows I used the pycharm, personal feeling that this is an excellent Python learning software. Crawler, that is, web crawler, we can be understood as crawling on the internet has been spiders, the internet is likened to a large network, and the crawler