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Getting Started with PythonCarl Eichenberger
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Agenda
• What is Python and why use it?• Python basics• The ArcPy module – Python’s window to ArcGIS• Geoprocessing script tools• Resources
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What is Python?
“Python is an easy to learn, powerful language… (with) high level data structures and a simple but effective approach to object-oriented programming. Python’s elegant syntax and dynamic typing…make it an ideal language for scripting…in many areas and on most platforms.”
– python.orgScripting language of ArcGIS
Free, cross-platform, easy to learn, widely useful, great community
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Why use Python and ArcGIS?
Automate repetitive tasksMake your own spatial analysis toolsAdd geoprocessing to web applicationsExtend the capabilities of ArcGIS
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Python Basics
Where do I write Python code?Python file is text with .py extensionIDE like PyScripter, Wing IDE ($), PythonWin, IDLEPython window in ArcGIS
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Python building blocks
Function: a defined piece of functionality that performs a specific task; requires argumentsModule: a Python file where functions live; importPackage: a collection of related modules
import mathmath.sqrt(100) … 10
Python Standard Library / Built-insos, sys, math, datetime, urllib2
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Writing Python codePython basicsPython IDEArcGIS Python window
Demo
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The ArcPy Module
Site package that adds ArcGIS functionality to PythonAccess to rich suite of geoprocessing toolsFunctions, classes and modules
Helper functions like ListFeatureClasses, DescribeClasses that can be used to create complex objects likeSpatialReference, FieldMapModules that provide specialized functionality like Mapping,SpatialAnalyst, NetworkAnalyst, DataAccess
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Run geoprocessing tools
import arcpy
Tool syntaxarcpy.Buffer_analysis()Enter input and output parameters
How do I use a specific tool?Tool help pageCopy as Python Snippethelp(arcpy.Buffer_analysis)Export from Model Builder
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Python script tools
Make your Python script into a geoprocessing tool
Great way to create and share workflows, extend ArcGIS
More accessible than stand-alone script
Share as a geoprocessing package or service
Integrated with geoprocessing frameworkUse it just like any other tool
Works with map layers, selections
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Geoprocessing script tool
Demo
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Resourcesresources.ArcGIS.com
arcpy.wordpress.com
GIS Stack Exchange, Stack Overflow
Python ReferencesPython Scripting for ArcGIS
by Zandbergen (Esri Press)
GIS Tutorial for Python Scripting
by Allen (Esri Press)
Learning Python
by Lutz
The Python Standard Library by Example
by Hellmann
python.org
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