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Paul A. Zandbergen

PYTHON

Scripting for ArcGIS

Esri Press, 380 New York Street, Redlands, California 92373-8100

Copyright © 2013 Esri

All rights reserved. First edition

Printed in the United States of America

17 16 15 14 13 1 2 3 4 5 6 7 8 9 10

Library of Congress has cataloged the print edition as follows:

Zandbergen, Paul A., 1968-

Python scripting for Ar

cGIS / Paul A. Zandbergen.

First edition.

pages cm

Includes index.

ISBN 978-1-58948-371-2 (pbk.)

eISBN 978-1-58948-362-0 (electronic) 1. Ar cGIS. 2. Geographic information systems. 3. Graphical user interfaces ( Computer systems) 4. Python (Computer program language) I. Title.

G70.212.Z36 2013

910.285"5133--dc23

2012020676

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Contents

Preface ________________________________________________xi Acknowledgments ______________________________________xiv Part 1: Learning the fundamentals of Python and geoprocessing __1

Chapter 1: Introducing Python

___________________________________3 1.1 Introduction ___________________________________________3 1.2 Exploring the features of Python _________________________3 1.3 Comparing scripting vs. programming ____________________4 1.4 Using scripting in ArcGIS _______________________________5 1.5 Python history and versions _____________________________5 1.6 About this book _______________________________________6 1.7 Exploring how Python is used ___________________________8 1.8 Choosing a Python script editor ________________________13 Points to remember ___________________________________19

Chapter 2: Geoprocessing in ArcGIS

_____________________________21 2.1 Introduction __________________________________________21 2.2 What is geoprocessing? ________________________________21 2.3 A note on ArcObjects__________________________________23 2.4 Using toolboxes and tools ______________________________24 2.5 Learning types and categories of tools ___________________25 2.6 Running tools using tool dialog boxes ___________________26 2.7 Specifying environment settings ________________________30 2.8 Using batch processing ________________________________32 2.9 Using models and ModelBuilder ________________________34 2.10 Using scripting _______________________________________38 2.11 Running scripts as tools _______________________________41 2.12 Converting a model to a script __________________________44 2.13 Scheduling a Python script to run at prescribed times _____45 Points to remember ___________________________________47 viContents Chapter 3: Using the Python window_____________________________49 3.1 Introduction __________________________________________49 3.2 Opening the Python window ___________________________49 3.3 Writing and running code ______________________________50 3.4 Getting assistance _____________________________________52 3.5 Exploring Python window options ______________________54 3.6 Saving your work _____________________________________55 3.7 Loading code into the Python window __________________56 Points to remember ___________________________________57

Chapter 4: Learning Python language fundamentals

_______________59 4.1 Introduction __________________________________________59 4.2 Locating Python documentation and resources ___________59 4.3 Working with data types and structures _________________60 4.4 Working with numbers ________________________________60 4.5 Working with variables and naming _____________________62 4.6 Writing statements and expressions _____________________63 4.7 Using strings _________________________________________64 4.8 Using lists____________________________________________66 4.9 Working with Python objects ___________________________66 4.10 Using functions _______________________________________68 4.11 Using methods _______________________________________69 4.12 Working with strings __________________________________70 4.13 Working with lists ____________________________________74 4.14 Working with paths ___________________________________78 4.15 Working with modules ________________________________79 4.16 Controlling work-ow using conditional statements _______81 4.17 Controlling work-ow using loop structures ______________83 4.18 Getting user input ____________________________________85 4.19 Commenting scripts ___________________________________86 4.20 Working with code in the PythonWin editor _____________88 4.21 Following coding guidelines ____________________________89 Points to remember ___________________________________90 vii Contents

Part 2: Writing scripts

Chapter 5: Geoprocessing using Python

_________________________95 5.1 Introduction __________________________________________95 5.2 Using the ArcPy site package ___________________________95 5.3 Importing ArcPy ______________________________________96 5.4 Working with earlier versions of ArcGIS _________________97 5.5 Using tools ___________________________________________98 5.6 Working with toolboxes _______________________________104quotesdbs_dbs17.pdfusesText_23

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