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Python Data Analysis, Second Edition

You're reading from   Python Data Analysis, Second Edition Data manipulation and complex data analysis with Python

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781787127487
Length 330 pages
Edition 2nd Edition
Languages
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Author (1):
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Ivan Idris Ivan Idris
Author Profile Icon Ivan Idris
Ivan Idris
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Table of Contents (16) Chapters Close

Preface 1. Getting Started with Python Libraries FREE CHAPTER 2. NumPy Arrays 3. The Pandas Primer 4. Statistics and Linear Algebra 5. Retrieving, Processing, and Storing Data 6. Data Visualization 7. Signal Processing and Time Series 8. Working with Databases 9. Analyzing Textual Data and Social Media 10. Predictive Analytics and Machine Learning 11. Environments Outside the Python Ecosystem and Cloud Computing 12. Performance Tuning, Profiling, and Concurrency A. Key Concepts
B. Useful Functions C. Online Resources

Parsing HTML with Beautiful Soup


Hypertext Markup Language (HTML) is the fundamental technology used to create web pages. HTML is composed of HTML elements that consist of so-called tags enveloped in slanted brackets (for example, <html>). Often, tags are paired with a starting and closing tag in a hierarchical, tree-like structure. An HTML-related draft specification was first published by Berners-Lee in 1991. Initially, there were only 18 HTML elements. The formal HTML definition was published by the Internet Engineering Task Force (IETF) in 1993. The IETF completed the HTML 2.0 standard in 1995. Around 2013, the latest HTML version, HTML5, was specified. HTML is not a very strict standard compared to XHTML and XML.

Modern browsers tolerate a lot of violations of the standard, making web pages a form of unstructured data. We can treat HTML as a big string and perform string operations on it with regular expressions, for example. This approach works only for simple projects.

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