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Natural Language Processing with Python
Natural Language Processing
with Python
Steven Bird, Ewan Klein, and Edward Loper
Beijing •
Cambridge •
Farnham •
Köln •
Sebastopol •
Taipei •
Tokyo
Natural Language Processing with Python
by Steven Bird, Ewan Klein, and Edward Loper
Copyright © 2009 Steven Bird, Ewan Klein, and Edward Loper. All rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.
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). For more information, contact our corporate/institutional sales department: (800) 998-9938 or corporate@oreilly.com
.
Editor:
Julie Steele
Indexer:
Ellen Troutman Zaig
Production Editor:
Loranah Dimant
Cover Designer:
Karen Montgomery
Copyeditor:
Genevieve d’Entremont
Interior Designer:
David Futato
Proofreader:
Loranah Dimant
Illustrator:
Robert Romano
Printing History:
June 2009:
First Edition.
Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of
O’Reilly Media, Inc. Natural Language Processing with Python
, the image of a right whale, and related
trade dress are trademarks of O’Reilly Media, Inc.
Many of the designations used by manufacturers and sellers to distinguish their products are claimed as
trademarks. Where those designations appear in this book, and O’Reilly Media, Inc. was aware of a
trademark claim, the designations have been printed in caps or initial caps.
While every precaution has been taken in the preparation of this book, the publisher and authors assume
no responsibility for errors or omissions, or for damages resulting from the use of the information con-
tained herein.
ISBN: 978-0-596-51649-9
[M]
1244726609
Table of Contents
Preface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ix
1. Language Processing and Python
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
1.1 Computing with Language: Texts and Words
1
1.2 A Closer Look at Python: Texts as Lists of Words
10
1.3 Computing with Language: Simple Statistics
16
1.4 Back to Python: Making Decisions and Taking Control
22
1.5 Automatic Natural Language Understanding
27
1.6 Summary
33
1.7 Further Reading
34
1.8 Exercises
35
2. Accessin ............

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