Getting Started with Beautiful Soup

Vineeth G. Nair

• Editore: Packt Publishing
• Anno: 2014
• ISBN:
  9781783289554
• Edizione: 1
• Argomento: Informatik
• Categoria: Programmierung in HTML

In Detail

Beautiful Soup is a Python library designed for quick turnaround projects like screen-scraping. Beautiful Soup provides a few simple methods and Pythonic idioms for navigating, searching, and modifying a parse tree: a toolkit for dissecting a document and extracting what you need without writing excess code for an application. It doesn't take much code to write an application using Beautiful Soup.

Getting Started with Beautiful Soup is a practical guide to Beautiful Soup using Python. The book starts by walking you through the installation of each and every feature of Beautiful Soup using simple examples which include sample Python codes as well as diagrams and screenshots wherever required for better understanding. The book discusses the problems of how exactly you can get data out of a website and provides an easy solution with the help of a real website and sample code.

Getting Started with Beautiful Soup goes over the different methods to install Beautiful Soup in both Linux and Windows systems. You will then learn about searching, navigating, content modification, encoding support, and output formatting with the help of examples and sample Python codes for each example so that you can try them out to get a better understanding. This book is a practical guide for scraping information from any website. If you want to learn how to efficiently scrape pages from websites, then this book is for you.

Approach

This book is a practical, hands-on guide that takes you through the techniques of web scraping using Beautiful Soup.

Who this book is for

Getting Started with Beautiful Soup is great for anybody who is interested in website scraping and extracting information. However, a basic knowledge of Python, HTML tags, and CSS is required for better understanding.

Getting Started with Beautiful Soup

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Table of Contents

Getting Started with Beautiful Soup

Credits

About the Author

About the Reviewers

www.PacktPub.com

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Why Subscribe?

Free Access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Installing Beautiful Soup

Installing Beautiful Soup

Installing Beautiful Soup in Linux

Installing Beautiful Soup using package manager

Installing Beautiful Soup using pip or easy_install

Installing Beautiful Soup using pip

Installing Beautiful Soup using easy_install

Installing Beautiful Soup in Windows

Verifying Python path in Windows

Installing Beautiful Soup using setup.py

Using Beautiful Soup without installation

Verifying the installation

Quick reference

Summary

2. Creating a BeautifulSoup Object

Creating a BeautifulSoup object

Creating a BeautifulSoup object from a string

Creating a BeautifulSoup object from a file-like object

Creating a BeautifulSoup object for XML parsing

Understanding the features argument

Tag

Accessing the Tag object from BeautifulSoup

Name of the Tag object

Attributes of a Tag object

The NavigableString object

Quick reference

Summary

3. Search Using Beautiful Soup

Searching in Beautiful Soup

Searching with find()

Finding the first producer

Explaining find()

Searching for tags

Searching for text

Searching based on regular expressions

Searching based on attribute values of a tag

Finding the first primary consumer

Searching based on custom attributes

Searching based on the CSS class

Searching using functions defined

Applying searching methods in combination

Searching with find_all()

Finding all tertiary consumers

Understanding parameters used with find_all()

Searching for Tags in relation

Searching for the parent tags

Searching for siblings

Searching for next

Searching for previous

Using search methods to scrape information from a web page

Quick reference

Summary

4. Navigation Using Beautiful Soup

Navigation using Beautiful Soup

Navigating down

Using the name of the child tag

Using predefined attributes

The .contents attribute

The .children attribute

The .descendants attribute

Special attributes for navigating down

The .string attribute

The .strings attribute

Navigating up

The .parent attribute

The .parents attribute

Navigating sideways to the siblings

The .next_sibling attribute

The .previous_sibling attribute

Navigating to the previous and next objects parsed

Quick reference

Summary

5. Modifying Content Using Beautiful Soup

Modifying Tag using Beautiful Soup

Modifying the name property of Tag

Modifying the attribute values of Tag

Updating the existing attribute value of Tag

Adding new attribute values to Tag

Deleting the tag attributes

Adding a new tag

Adding a new producer using new_tag() and append()

Creating a new tag using new_tag()

Adding a new tag using append()

Adding a new div tag to the li tag using insert()

Modifying string contents

Using .string to modify the string content

Adding strings using .append(), insert(), and new_string()

Deleting tags from the HTML document

Deleting the producer using decompose()

Deleting the producer using extract()

Deleting the contents of a tag using Beautiful Soup

Special functions to modify content

Quick reference

Summary

6. Encoding Support in Beautiful Soup

Encoding in Beautiful Soup

Understanding the original encoding of the HTML document

Specifying the encoding of the HTML document

Output encoding

Quick reference

Summary

7. Output in Beautiful Soup

Formatted printing

Unformatted printing

Output formatters in Beautiful Soup

The minimal formatter

The html formatter

The None formatter

The function formatter

Using get_text()

Quick reference

Summary

8. Creating a Web Scraper

Getting book details from PacktPub.com

Finding pages with a list of books

Finding book details

Getting selling prices from Amazon

Getting the selling price from Barnes and Noble

Summary

Index

Getting Started with Beautiful Soup

Copyright © 2014 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: January 2014

Production Reference: 1170114

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78328-955-4

www.packtpub.com

Cover Image by Mohamed Raoof (<[email protected]>)

Credits

Author

Vineeth G. Nair

Reviewers ...