How to enter the world of Python Programming for ArcGIS Or, a funny thing happened on the way from an ESRI conference By Katherine Paybins WVAGP Membership.

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Presentation transcript:

How to enter the world of Python Programming for ArcGIS Or, a funny thing happened on the way from an ESRI conference By Katherine Paybins WVAGP Membership Meeting, November 3, 2011

Why use Python in ArcGIS 9 or 10? With ArcGIS 10, Python scripting takes front place for programming repetitive tasks and creating custom functions for the ArcToolbox. Python as a programming language has been around for awhile, and when your ArcGIS 10 was installed, Python was also, with a GUI included called the Idle Python Shell. There are other GUIs out there, but the Idle GUI is one of the more popular for it’s ease of use.

From the Python Tutorial Python is an easy to learn, powerful programming language. It has efficient high-level data structures and a simple but effective approach to object-oriented programming. Python’s elegant syntax and dynamic typing, together with its interpreted nature, make it an ideal language for scripting and rapid application development in many areas on most platforms. The Python interpreter and the extensive standard library are freely available in source or binary form for all major platforms from the Python Web site, and may be freely distributed. The same site also contains distributions of and pointers to many free third party Python modules, programs and tools, and additional documentation.

From ESRI help documents Python was introduced to the ArcGIS community at 9.0. Since then, it has been accepted as the scripting language of choice for geoprocessing users and continues to grow. Each release has furthered the Python experience, providing you with more capabilities and a richer, more Python-friendly experience. ESRI has fully embraced Python for ArcGIS and sees Python as the language that fulfills the needs of our user community. Here are just some of the advantages of Python: Easy to learn and excellent for beginners, yet superb for experts Highly scalable, suitable for large projects or small one-off programs known as scripts Portable, cross-platform Embeddable (making ArcGIS scriptable) Stable and mature A large user community Python extends across ArcGIS and becomes the language for data analysis, data conversion, data management, and map automation, helping increase productivity.

More help pages

Where to find in ArcGIS?

The IDLE python shell:

Look at the ESRI site for sample scripts to download, and also look within the ArcToolBox for scripts.

Online classes The Python tutorial is available on several sites, but you have it on your computer if you have ArcGIS installed ESRI offers twelve online courses relating directly to or referencing Python, including: Basics of Python (for ArcGIS 10) Python Scripting for Map Automation in ArcGIS 10 Python Scripting for Geoprocessing Workflows (ArcGIS 10)

An example of learning the software First, conference sessions showing use of the new arcpy set of python scripts Next, taking the tutorial and starting a notes for future reference/ copy and paste into Python. Also, testing out running commands in the Python window Purchased a couple of books on the topic- I like the Python Phrasebook by Brad Dayley, and Core Python Programming by Wesley Chun As I work on projects, I try to view any Python scripts in the GeoProcessing tools

Taking notes is a good idea For instance, here are some notes from the Tutorial that I have kept for reference and cut/paste. ________________________________________________________ Commands to start at beginning of interactive Python session, or in a script if I want the functionality included by using these commands. import os filename = os.environ.get('PYTHONSTARTUP') if filename and os.path.isfile(filename): execfile(filename) import env import arcpy arcpy.sa arcpy.mapping arcpy.ga

An easy way to make a python program from geoprocessing models:

Here is that Python script:

Open and view scripts from the ArcToolbox

Questions?