en
Книги
Richard Lawson

Web Scraping with Python

Successfully scrape data from any website with the power of Python
About This BookA hands-on guide to web scraping with real-life problems and solutionsTechniques to download and extract data from complex websitesCreate a number of different web scrapers to extract informationWho This Book Is ForThis book is aimed at developers who want to use web scraping for legitimate purposes. Prior programming experience with Python would be useful but not essential. Anyone with general knowledge of programming languages should be able to pick up the book and understand the principals involved.
What You Will LearnExtract data from web pages with simple Python programmingBuild a threaded crawler to process web pages in parallelFollow links to crawl a websiteDownload cache to reduce bandwidthUse multiple threads and processes to scrape fasterLearn how to parse JavaScript-dependent websitesInteract with forms and sessionsSolve CAPTCHAs on protected web pagesDiscover how to track the state of a crawlIn DetailThe Internet contains the most useful set of data ever assembled, largely publicly accessible for free. However, this data is not easily reusable. It is embedded within the structure and style of websites and needs to be carefully extracted to be useful. Web scraping is becoming increasingly useful as a means to easily gather and make sense of the plethora of information available online. Using a simple language like Python, you can crawl the information out of complex websites using simple programming.
This book is the ultimate guide to using Python to scrape data from websites. In the early chapters it covers how to extract data from static web pages and how to use caching to manage the load on servers. After the basics we'll get our hands dirty with building a more sophisticated crawler with threads and more advanced topics. Learn step-by-step how to use Ajax URLs, employ the Firebug extension for monitoring, and indirectly scrape data. Discover more scraping nitty-gritties such as using the browser renderer, managing cookies, how to submit forms to extract data from complex websites protected by CAPTCHA, and so on. The book wraps up with how to create high-level scrapers with Scrapy libraries and implement what has been learned to real websites.
Style and approachThis book is a hands-on guide with real-life examples and solutions starting simple and then progressively becoming more complex. Each chapter in this book introduces a problem and then provides one or more possible solutions.
198 печатни страници
Година на публикуване
2015
Издател
Packt Publishing
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    Ethan Huntцитирапреди 4 години
    ;td> element of class w2p_fw
    camille2pro4uцитирапреди 5 години
    n order to scrape a website, we first need to download its web pages containing the data of interest—a process known as crawling. There are a number of approaches that can be used to crawl a website, and the appropriate choice will depend on the structure of the target website. This chapter will explore how to download web pages safely, and then introduce the following
    camille2pro4uцитирапреди 5 години
    will raise an exception and exit the script. To be safer, here is a more robust version to catch these exceptions

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