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I have been posting similar questions recently, but I found a template code for a Python toolbox and I would like more help.

I am trying to create a tool in ArcGIS Pro that takes parameters from users (initially, the geodatabase filename) and shows the report on the screen.

I added to the template the function "getParameter." I thought this function will open up a dialog box for a user to choose a parameter, but it does not for some reason.

The following code has no syntax error. When I add a new Python toolbox and ran this code, it does run, but it says "no parameters," as the screenshot says. What change do I need to make?enter image description here 

import arcpy import os class Toolbox(object): def __init__(self): """Define the toolbox (the name of the toolbox is the name of the .pyt file).""" self.label = "Toolbox" self.alias = "" # List of tool classes associated with this toolbox self.tools = [Report] class Report(object): def __init__(self): """Define the tool (tool name is the name of the class).""" self.label = "Tool" self.description = "" self.canRunInBackground = False def getParameter(self): arcpy.env.workspace = arcpy.GetParameterAsText(0) featureclasses = arcpy.ListFeatureClasses() for fc = in featureclasses: print (fc) def getParameterInfo(self): """Define parameter definitions""" params = None return params def isLicensed(self): """Set whether tool is licensed to execute.""" return True def updateParameters(self, parameters): """Modify the values and properties of parameters before internal validation is performed. This method is called whenever a parameter has been changed.""" return def updateMessages(self, parameters): """Modify the messages created by internal validation for each tool parameter. This method is called after internal validation.""" return def execute(self, parameters, messages): """The source code of the tool.""" return
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    Did you try returning something for getParameterInfo? pro.arcgis.com/en/pro-app/arcpy/geoprocessing_and_python/… Commented Jan 30, 2020 at 21:18
  • So, are you saying that because in my code, it says params = None, it returns nothing? Should I change it to 0 then? Commented Jan 30, 2020 at 21:26
  • The parameter need to be a path to a filename (initially, geodatabase filename.) What datatype should I choose for that? Commented Jan 30, 2020 at 21:35
  • You said that you "have been posting similar questions recently". Please always include links to any GIS SE questions that you mention in a new question so that potential answerers do not have to go looking for them before deciding whether this is actually a non-duplicate question. Commented Jan 30, 2020 at 22:03
  • Have you reviewed Defining parameters in a Python toolbox? Commented Jan 30, 2020 at 22:04

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I suggest you look at the Python Toolbox documentation, particularly:

Your code was not working because:

  • your getParameterInfo method was returning None instead of a list of Parameter definitions
  • Your getParameter method will never get called as it's not part of the python toolbox API
  • Your execute method did nothing.

Here's a working example

import arcpy class Toolbox(object): def __init__(self): """Define the toolbox (the name of the toolbox is the name of the .pyt file).""" self.label = "Toolbox" self.alias = "" # List of tool classes associated with this toolbox self.tools = [Report] class Report(object): def __init__(self): """Define the tool (tool name is the name of the class).""" self.label = "Tool" self.description = "" self.canRunInBackground = True def getParameterInfo(self): # Define parameter definitions params = [] # First parameter param0 = arcpy.Parameter( displayName="Input workspace", name="in_workspace", datatype="DEWorkspace", parameterType="Required", direction="Input") params.append(param0) return params def execute(self, parameters, messages): """The source code of the tool.""" arcpy.env.workspace = parameters[0].valueAsText featureclasses = arcpy.ListFeatureClasses() for fc in featureclasses: messages.addMessage(fc)
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  • Thank you, but I just realized I have been barkin at the wrong tree. All this time I was thinking I was supposed to make Python toolbox, but actually I am supposed to make a script toolbox... Thank you tho! Commented Jan 31, 2020 at 22:13

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