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Python: An IntroductionBrittney White
Questions we’ll address
• What is Python?• Why use Python with ArcGIS?• What is ArcPy?• Where do I write Python code?• How do I run a geoprocessing tool?• How do I perform batch processing?• How do I use data properties to control the flow of a script?• Bonus: 5 tips & tricks for getting started with Python
What is Python?
• Simple and easy to learn• Free and open source• Cross platform• Scripting language of ArcGIS
Why use Python with ArcGIS?
• Automate repetitive tasks- Data management- Spatial analysis- Map automation
• Make your own geoprocessing tools
What is ArcPy?
• Access point to ArcGIS desktop functionality through Python
1. Geoprocessing tools2. Functions like ListFeatureClasses,
Describe3. Classes like Polygon, SpatialReference4. Modules like arcpy.da, arcpy.mp
Demo: ArcGIS Pro Python Reference
Where do I write Python code?
• Integrated Development Environment (IDE)- PyCharm, Spyder, Wing IDE, Python IDLE,…
• Python window in ArcGIS
Demo: Python window & IDE
Where do I write Python code?
Desired task Python window Python IDEExecute a single line of code Work directly with layers in ArcGIS Pro Test geoprocessing workflows and visually verify results Work with tools to enter, edit, and check syntax in your code
How do I run a geoprocessing tool?
• Tool syntax- arcpy.toolname_toolboxalias(parameters)
- arcpy.toolboxalias.toolname(parameters)
• Where do I find the syntax?- Tool help page- help(arcpy.buffer_analysis)
- Copy Python command- Send to Python window
Demo: Geoprocessing tool syntax
How do I perform batch processing?
How do I perform batch processing?List feature classes example
• arcpy.ListFeatureClasses ({wild_card}, {feature_type}, {feature_dataset})
- Returns a list of feature classes in the workspace
How do I access data properties?
• arcpy.Describe()- Returns a describe object - Describe object has dynamic properties
How do I access data properties?…to control the flow the script?
if arcpy.Describe().property == something:
#Do something
else:
#Do something else
Demo: Prepare shapefiles for analysis
Goal ArcPyList the shapefiles in a folder
List function -arcpy.ListFeatureClasses()
Check the coordinate system of each shapefile
Describe function - arcpy.Describe()
Project the shapefiles into the local coordinate system
Geoprocessing tool -arcpy.Project_management()
Move shapefiles into a file geodatabase
Geoprocessing tool -arcpy.CopyFeatures_management()
5 tips & tricks for getting started with Python
5. Use the print function
print function
4. Copy and paste
Copy and paste - Code samples
Copy and paste - Paths
Shift + Right-click a file reveals the Copy as path option
3. Participate in the GeoNetPython community
2. Take Esri Training about Python
https://www.esri.com/training/catalog/
1. Manage Python packages with ArcGIS Pro
Print Your Certificate of AttendancePrint Stations Located at L Street Bridge
Tuesday Wednesday12:30 pm – 6:30 pm GIS Solutions Expo Hall D
5:15 pm – 6:30 pm GIS Solutions Expo SocialHall D
10:45 am – 5:15 pm GIS Solutions Expo Hall D
6:30 pm – 9:00 pm Networking ReceptionNational Building Museum
Please Take Our Survey on the AppDownload the Esri Events app and find your event
Select the session you attended
Scroll down to find the feedback section
Complete answersand select “Submit”
Python Sessions at #FedGIS
Session Tuesday WednesdayPython: An Introduction 1:45 pm – 2:45 pm in 202B 8:30 am – 9:30 am in 202BPython: Beyond the Basics 4:15 pm – 5:15 pm in 208AB 11:00 am – 12:00 pm in 202BUsing Python in ArcGIS Enterprise
8:30 am – 9:30 am in 201
Python: Building Geoprocessing Tools
5:15 pm – 6:15 pm in 201
Data Science in ArcGIS Using Python and R
4:00 pm – 5:00 pm in 202B
Machine Learning in ArcGIS 4:15 pm – 5:15 pm in 202 A 8:30 am – 9:30 am in 202A
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