How to Handle MultiValue Parameters in Python Toolbox Tool

BradyWalker2 — Wed, 06 Mar 2024 19:36:26 GMT

I am working on a tool for our Planning team. What this tool needs to do is take input parcel account numbers and a buffer distance before it selects the input parcels, creates a buffer, selects all parcels in the buffer, and then runs a bunch of calculations. Normally, a single parcel is used as the input, but on rare occasions multiple parcels are used as the input.

I've set up a model in ArcGIS Pro and exported to python to help me get started. Here's what I've got so far:

import arcpy from sys import argv temp = r"\\\\Workspace\Location" arcpy.env.scratchWorkspace = temp arcpy.env.workspace = temp arcpy.env.overwriteOutput = True arcpy.AddMessage(arcpy.env.workspace) arcpy.overwriteOutput = True class Toolbox: def __init__(self): """Define the toolbox (the name of the toolbox is the name of the .pyt file).""" self.label = "Toolbox" self.alias = "toolbox" # List of tool classes associated with this toolbox self.tools = [Tool] class Tool: def __init__(self): """Define the tool (tool name is the name of the class).""" self.label = "Zoning Maps Tool" self.description = "" def getParameterInfo(self): """Define the tool parameters.""" params = [ arcpy.Parameter(displayName="Account", name="account_numbers", datatype="GPString", parameterType="Required", direction="Input", multiValue= True), arcpy.Parameter(displayName="Buffer (Feet)", name="buffer", datatype="Double", parameterType="Required", direction="Input") ] return params def isLicensed(self): """Set whether the tool is licensed to execute.""" return True

Below is a picture of the input before I run the tool.

Is this the correct way to handle multiple input parcels? How should I set up the select tool to handle multiple parcels?

def execute(self, parameters, messages): """The source code of the tool.""" account_numbers = parameters[0].valueAsText buffer = parameters[1].valueAsText

Re: How to Handle MultiValue Parameters in Python Toolbox Tool

DuncanHornby — Wed, 13 Mar 2024 16:50:34 GMT

Seems alright to me. Remember a multi-value comes back as semi-colon separated, so first thing I tend to do split it into a list. You can add the following line to your execute function to get an idea of what is returned.

arcpy.AddMessage(account_numbers.split(";"))

topic Re: How to Handle MultiValue Parameters in Python Toolbox Tool in Geoprocessing Questions

How to Handle MultiValue Parameters in Python Toolbox Tool

Re: How to Handle MultiValue Parameters in Python Toolbox Tool