Book Image

Python Text Processing with NLTK 2.0 Cookbook

By : Jacob Perkins
Book Image

Python Text Processing with NLTK 2.0 Cookbook

By: Jacob Perkins

Overview of this book

<p>Natural Language Processing is used everywhere – in search engines, spell checkers, mobile phones, computer games – even your washing machine. Python's Natural Language Toolkit (NLTK) suite of libraries has rapidly emerged as one of the most efficient tools for Natural Language Processing. You want to employ nothing less than the best techniques in Natural Language Processing – and this book is your answer.<br /><br /><em>Python Text Processing with NLTK 2.0 Cookbook</em> is your handy and illustrative guide, which will walk you through all the Natural Language Processing techniques in a step–by-step manner. It will demystify the advanced features of text analysis and text mining using the comprehensive NLTK suite.<br /><br />This book cuts short the preamble and you dive right into the science of text processing with a practical hands-on approach.<br /><br />Get started off with learning tokenization of text. Get an overview of WordNet and how to use it. Learn the basics as well as advanced features of Stemming and Lemmatization. Discover various ways to replace words with simpler and more common (read: more searched) variants. Create your own corpora and learn to create custom corpus readers for JSON files as well as for data stored in MongoDB. Use and manipulate POS taggers. Transform and normalize parsed chunks to produce a canonical form without changing their meaning. Dig into feature extraction and text classification. Learn how to easily handle huge amounts of data without any loss in efficiency or speed.<br /><br />This book will teach you all that and beyond, in a hands-on learn-by-doing manner. Make yourself an expert in using the NLTK for Natural Language Processing with this handy companion.</p>
Table of Contents (16 chapters)
Python Text Processing with NLTK 2.0 Cookbook
Credits
About the Author
About the Reviewers
Preface
Penn Treebank Part-of-Speech Tags
Index

Translating text with Babelfish


Babelfish is an online language translation API provided by Yahoo. With it, you can translate text in a source language to a target language. NLTK comes with a simple interface for using it.

Getting ready

Be sure you are connected to the internet first. The babelfish.translate() function requires access to Yahoo's online API in order to work.

How to do it...

To translate your text, you first need to know two things:

  1. The language of your text or source language.

  2. The language you want to translate to or target language.

Language detection is outside the scope of this recipe, so we will assume you already know the source and target languages.

>>> from nltk.misc import babelfish
>>> babelfish.translate('cookbook', 'english', 'spanish')
'libro de cocina'
>>> babelfish.translate('libro de cocina', 'spanish', 'english')
'kitchen book'
>>> babelfish.translate('cookbook', 'english', 'german')
'Kochbuch'
>>> babelfish.translate...