Web2py8.5plus3minus4plus24plus2minus2Complete …

MASSIMO DI PIERRO

WEB2PY

COMPLETE REFERENCE MANUAL, 5TH EDITION

EXPERTS4SOLUTIONS

Copyright 2008-2013 by Massimo Di Pierro. All rights reserved.

THE CONTENT OF THIS BOOK IS PROVIDED UNDER THE TERMS OF THE CREATIVE COMMONS PUBLIC LICENSE BY-NC-ND 3.0.

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THE WORK IS PROTECTED BY COPYRIGHT AND/OR OTHER APPLICABLE LAW. ANY USE OF THE WORK OTHER THAN AS AUTHORIZED UNDER THIS LICENSE OR COPYRIGHT LAW IS PROHIBITED. BY EXERCISING ANY RIGHTS TO THE WORK PROVIDED HERE, YOU ACCEPT AND AGREE TO BE BOUND BY THE TERMS OF THIS LICENSE. TO THE EXTENT THIS LICENSE MAY BE CONSIDERED TO BE A CONTRACT, THE LICENSOR GRANTS YOU THE RIGHTS CONTAINED HERE IN CONSIDERATION OF YOUR ACCEPTANCE OF SUCH TERMS AND CONDITIONS. Limit of Liability/Disclaimer of Warranty: While the publisher and author have used their best efforts in preparing this book, they make no representations or warranties with respect to the accuracy or completeness of the contents of this book and specifically disclaim any implied warranties of merchantability or fitness for a particular purpose. No warranty may be created ore extended by sales representatives or written sales materials. The advice and strategies contained herein may not be suitable for your situation. You should consult with a professional where appropriate. Neither the publisher nor author shall be liable for any loss of profit or any other commercial damages, including but not limited to special, incidental, consequential, or other damages.

For more information about appropriate use of this material contact:

Massimo Di Pierro School of Computing DePaul University 243 S Wabash Ave Chicago, IL 60604 (USA) Email: massimo.dipierro@

Library of Congress Cataloging-in-Publication Data:

ISBN: 978-0-578-12021-8 Build Date: March 3, 2013

to my family

Contents

1 Introduction

23

1.1 Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

1.2 Web frameworks . . . . . . . . . . . . . . . . . . . . . . . . . 26

1.3 Model-View-Controller . . . . . . . . . . . . . . . . . . . . . . 28

1.4 Why web2py . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

1.5 Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

1.6 In the box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

1.7 About this book . . . . . . . . . . . . . . . . . . . . . . . . . . 37

1.8 Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

1.9 Contribute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

1.10 Elements of style . . . . . . . . . . . . . . . . . . . . . . . . . 40

1.11 License . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

1.12 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 42

2 The Python language

47

2.1 About Python . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

2.2 Starting up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

2.3 help, dir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

2.4 Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

2.4.1 str . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

2.4.2 list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

2.4.3 tuple . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

2.4.4 dict . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

2.5 About indentation . . . . . . . . . . . . . . . . . . . . . . . . 55

2.6 for...in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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