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Bibliographic Details

Title: Web Scraping with Python Successfully scrape...

Publisher: Packt Publishing Limited

Publication Date: 2015

Binding: PAP

Condition: New

About this title

Synopsis:

Successfully scrape data from any website with the power of Python

About This Book

A hands-on guide to web scraping with real-life problems and solutions
Techniques to download and extract data from complex websites
Create a number of different web scrapers to extract information

Who This Book Is For

This 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 Learn

Extract data from web pages with simple Python programming
Build a threaded crawler to process web pages in parallel
Follow links to crawl a website
Download cache to reduce bandwidth
Use multiple threads and processes to scrape faster
Learn how to parse JavaScript-dependent websites
Interact with forms and sessions
Solve CAPTCHAs on protected web pages
Discover how to track the state of a crawl

In Detail

The 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 approach

This 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.

About the Author:

Richard Lawson

Richard Lawson is from Australia and studied Computer Science at the University of Melbourne. Since graduating, he built a business specializing at web scraping while traveling the world, working remotely from over 50 countries. He is a fluent Esperanto speaker, conversational at Mandarin and Korean, and active in contributing to and translating open source software. He is currently undertaking postgraduate studies at Oxford University and in his spare time enjoys developing autonomous drones.

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