Book Image

Python Web Scraping Cookbook

By : Michael Heydt
Book Image

Python Web Scraping Cookbook

By: Michael Heydt

Overview of this book

Python Web Scraping Cookbook is a solution-focused book that will teach you techniques to develop high-performance scrapers and deal with crawlers, sitemaps, forms automation, Ajax-based sites, caches, and more. You'll explore a number of real-world scenarios where every part of the development/product life cycle will be fully covered. You will not only develop the skills needed to design and develop reliable performance data flows, but also deploy your codebase to AWS. If you are involved in software engineering, product development, or data mining (or are interested in building data-driven products), you will find this book useful as each recipe has a clear purpose and objective. Right from extracting data from the websites to writing a sophisticated web crawler, the book's independent recipes will be a godsend. This book covers Python libraries, requests, and BeautifulSoup. You will learn about crawling, web spidering, working with Ajax websites, paginated items, and more. You will also learn to tackle problems such as 403 errors, working with proxy, scraping images, and LXML. By the end of this book, you will be able to scrape websites more efficiently and able to deploy and operate your scraper in the cloud.
Table of Contents (13 chapters)

Using auto throttling

Fairly closely tied to controlling the maximum level of concurrency is the concept of throttling. Websites vary in their ability to handle requests, both across multiple websites and on a single website at different times. During periods of slower response times, it makes sense to lighten up of the number of requests during that time. This can be a tedious process to monitor and adjust by hand.

Fortunately for us, scrapy also provides an ability to do this via an extension named AutoThrottle.

How to do it

AutoThrottle can easily be configured using the AUTOTHROTTLE_TARGET_CONCURRENCY setting:

process = CrawlerProcess({
'AUTOTHROTTLE_TARGET_CONCURRENCY': 3
})
process.crawl(Spider)
process...