Book Image

Hands-On Web Scraping with Python

By : Anish Chapagain
Book Image

Hands-On Web Scraping with Python

By: Anish Chapagain

Overview of this book

Web scraping is an essential technique used in many organizations to gather valuable data from web pages. This book will enable you to delve into web scraping techniques and methodologies. The book will introduce you to the fundamental concepts of web scraping techniques and how they can be applied to multiple sets of web pages. You'll use powerful libraries from the Python ecosystem such as Scrapy, lxml, pyquery, and bs4 to carry out web scraping operations. You will then get up to speed with simple to intermediate scraping operations such as identifying information from web pages and using patterns or attributes to retrieve information. This book adopts a practical approach to web scraping concepts and tools, guiding you through a series of use cases and showing you how to use the best tools and techniques to efficiently scrape web pages. You'll even cover the use of other popular web scraping tools, such as Selenium, Regex, and web-based APIs. By the end of this book, you will have learned how to efficiently scrape the web using different techniques with Python and other popular tools.
Table of Contents (16 chapters)
Free Chapter
Section 1: Introduction to Web Scraping
Section 2: Beginning Web Scraping
Section 3: Advanced Concepts
Section 4: Conclusion

Using regular expressions to extract data

Now that we've covered the basics and had an overview of Regex, we will use Regex to scrape (extract) data in bulk in a similar manner to using XPath, CSS selectors, pyquery, bs4, and so on by choosing between the implementation of Regex, XPath, pyquery, and more. This depends on the requirements and feasibility of web access and the availability of the content.

It's not always a requirement that the content should be unstructured to apply Regex and extract data. Regex can be implemented for both structured and unstructured web content that's found in order to extract the desired data. In this section, we'll explore a few examples while using Regex and its various properties.

Example 1 – extracting HTML-based content...