Pro+Django.pdf

Pro Django

Marty Alchin

Pro Django

electronic or mechanical, including photocopying, recording, or by any information storage or retrieval

system, without the prior written permission of the copyright owner and the publisher.

ISBN-13 (pbk): 978-1-4302-1047-4

ISBN-13 (electronic): 978-1-4302-1048-1

Printed and bound in the United States of America 9 8 7 6 5 4 3 2 1

Trademarked names may appear in this book. Rather than use a trademark symbol with every occurrence

of a trademarked name, we use the names only in an editorial fashion and to the benefit of the trademark

owner, with no intention of infringement of the trademark.

Java and all Java-based marks are trademarks or registered trademarks of Sun Microsystems, Inc., in the

US and other countries. Apress, Inc., is not affiliated with Sun Microsystems, Inc., and this book was writ-

ten without endorsement from Sun Microsystems, Inc.

Lead Editor: Steve Anglin

Technical Reviewers: Jacob Kaplan-Moss, George Vilches

Editorial Board: Clay Andres, Steve Anglin, Mark Beckner, Ewan Buckingham, Tony Campbell, Gary

Cornell, Jonathan Gennick, Jonathan Hassell, Michelle Lowman, Matthew Moodie, Duncan Parkes,

Jeffrey Pepper, Frank Pohlmann, Ben Renow-Clarke, Dominic Shakeshaft, Matt Wade, Tom Welsh

Project Manager: Richard Dal Porto

Copy Editors: Liz Welch, Ami Knox

Associate Production Director: Kari Brooks-Copony

Production Editor: Laura Cheu

Compositor: Kinetic Publishing Services, LLC

Proofreader: April Eddy

Indexer: Julie Grady

Cover Designer: Kurt Krames

Manufacturing Director: Tom Debolski

Distributed to the book trade worldwide by Springer-Verlag New York, Inc., 233 Spring Street, 6th Floor,

New York, NY 10013. Phone 1-800-SPRINGER, fax 201-348-4505, e-mail kn`ano)ju<olnejcan)o^i*_ki , or

visit dppl6++sss*olnejcankjheja*_ki .

For information on translations, please contact Apress directly at 2855 Telegraph Avenue, Suite 600,

Berkeley, CA 94705. Phone 510-549-5930, fax 510-549-5939, e-mail ejbk<]lnaoo*_ki(knreoepdppl6++

sss*]lnaoo*_ki .

Apress and friends of ED books may be purchased in bulk for academic, corporate, or promotional use.

eBook versions and licenses are also available for most titles. For more information, reference our Special

Bulk Sales–eBook Licensing web page at http://www.apress.com/info/bulksales.

The information in this book is distributed on an “as is” basis, without warranty. Although every precau-

tion has been taken in the preparation of this work, neither the author(s) nor Apress shall have any liability

to any person or entity with respect to any loss or damage caused or alleged to be caused directly or indi-

rectly by the information contained in this work.

The source code for this book is available to readers at dppl6++sss*]lnaoo*_ki . You will need to answer

questions pertaining to this book in order to successfully download the code.

Contents at a Glance

About the Author ..................................................................xiii

Acknowledgments ................................................................ xv

Preface ......................................................................... xvii

Introduction ......................................................................xix

CHAPTER 1 Understanding Django ...........................................1

CHAPTER 2 Django Is Python ...............................................13

CHAPTER 3 Models ........................................................45

CHAPTER 4 URLs and Views ................................................91

CHAPTER 5 Forms ........................................................113

CHAPTER 6 Templates ....................................................133

CHAPTER 7 Handling HTTP ................................................163

CHAPTER 8 Backend Protocols ............................................183

CHAPTER 9 Common Tools ................................................213

CHAPTER 10 Coordinating Applications .....................................231

CHAPTER 11 Enhancing Applications ........................................253

APPENDIX

INDEX .......................................................................285

iii

Contributing to Django .........................................279

Contents

About the Author ..................................................................xiii

Acknowledgments ................................................................ xv

Preface ......................................................................... xvii

Introduction ......................................................................xix

CHAPTER 1

Understanding Django .......................................1

Philosophy .......................................................1

Django’s Interpretation of the MVC Pattern ......................2

Loose Coupling ..............................................5

Don’t Repeat Yourself (DRY) ...................................5

A Focus on Readability .......................................6

Failing Loudly ...............................................6

Community ......................................................8

Management of the Framework ...............................9

News and Resources ........................................10

Reusable Applications .......................................10

Getting Help ...............................................11

Now What? .....................................................12

CHAPTER 2 Django Is Python ............................................13

How Python Builds Classes .......................................13

Building a Class Programmatically ............................14

Metaclasses Change It Up ...................................15

Using a Base Class with a Metaclass ..........................16

Declarative Syntax ..........................................17

Common Duck-Typing Protocols ..................................19

Callables ..................................................20

Dictionaries ................................................21

Files ......................................................22

Iterables ...................................................23

Sequences .................................................25

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: