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PythonCookbook3高清.pdf
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PythonCookbook3高清.pdf
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Python Cookbook, Third Edition
by David Beazley and Brian K. Jones
Copyright © 2013 David Beazley and Brian Jones. All rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.
O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are
also available for most titles (http://my.safaribooksonline.com). For more information, contact our corporate/
institutional sales department: 800-998-9938 or corporate@oreilly.com.
Editors: Meghan Blanchette and Rachel Roumeliotis
Production Editor: Kristen Borg
Copyeditor: Jasmine Kwityn
Proofreader: BIM Proofreading Services
Indexer: WordCo Indexing Services
Cover Designer: Karen Montgomery
Interior Designer: David Futato
Illustrator: Robert Romano
May 2013:
Third Edition
Revision History for the Third Edition:
2013-05-08: First release
See http://oreilly.com/catalog/errata.csp?isbn=9781449340377 for release details.
Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of O’Reilly
Media, Inc. Python Cookbook, the image of a springhaas, 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 trade‐
mark 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 contained
herein.
ISBN: 978-1-449-34037-7
[LSI]
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Table of Contents
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
1.
Data Structures and Algorithms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1. Unpacking a Sequence into Separate Variables 1
1.2. Unpacking Elements from Iterables of Arbitrary Length 3
1.3. Keeping the Last N Items 5
1.4. Finding the Largest or Smallest N Items 7
1.5. Implementing a Priority Queue 8
1.6. Mapping Keys to Multiple Values in a Dictionary 11
1.7. Keeping Dictionaries in Order 12
1.8. Calculating with Dictionaries 13
1.9. Finding Commonalities in Two Dictionaries 15
1.10. Removing Duplicates from a Sequence while Maintaining Order 17
1.11. Naming a Slice 18
1.12. Determining the Most Frequently Occurring Items in a Sequence 20
1.13. Sorting a List of Dictionaries by a Common Key 21
1.14. Sorting Objects Without Native Comparison Support 23
1.15. Grouping Records Together Based on a Field 24
1.16. Filtering Sequence Elements 26
1.17. Extracting a Subset of a Dictionary 28
1.18. Mapping Names to Sequence Elements 29
1.19. Transforming and Reducing Data at the Same Time 32
1.20. Combining Multiple Mappings into a Single Mapping 33
2.
Strings and Text. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.1. Splitting Strings on Any of Multiple Delimiters 37
2.2. Matching Text at the Start or End of a String 38
2.3. Matching Strings Using Shell Wildcard Patterns 40
2.4. Matching and Searching for Text Patterns 42
iii
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