Calling ModelBuilder model from Python script using ArcPy

Question

I updated the code in the script below per suggestion. I receive the same results as described in my original post, here...

I have a very simple Modelbuilder model (ArcGIS Pro, v2.6) that has a parameter for user input asking how many input feature classes to include (in a later model). I want the user to be able to input a number between 1-4 (AuxNum). If the user input value is 1 then a specific model runs, if the user input is 2 then a different model runs, and so on. Prior to the chosen model running, the user needs to be able to input parameter values prior to the model running. I want the python code to open the second model in the Geoprocessing window to allow the user to input parameters.

Here is the layout of the first user input model.

In the DecideAuxLayer tool in the above model layout, I have the following Python code, (spoiler alert!! I'm not a coder).

• Toolbox is PreProcesses.tbx

• Model names are Aux1, Aux2, Aux3, Aux4

• Models and python script are inside PreProcesses.tbx

• Toolbox, models, and .py are all located in C:\Temp

import arcpy
arcpy.AddToolbox("C:/Temp/PreProcesses.tbx")
AuxNum = arcpy.GetParameterAsText(0)
if (AuxNum is 1):
    arcpy.Aux1_PreProcesses()
elif (AuxNum is 2):
    arcpy.Aux2_PreProcesses()

Issue: when I run the Python script the model does not open in the Geoprocessing window. The model completes with no errors or warnings and shows that the input value is 1. That's it. Here is a screenshot of the results of the script model.

Answer 1

I believe the issue is to do with how you are testing the variable AuxNum. Your code returns the parameter value as a TEXT. You then test the TEXT variable with AuxNum is 1, is your TEXT a number...no! You then test if your TEXT variable is another number...which again is no! and thus nothing happens. You need to adjust your code to this:

(AuxNum == '1')

Now you are testing if your text variable is equal to the text '1'.

UPDATE

@GeoffreyWhitchurch so I spoofed up your scenario and it worked for me. Looking at your screen shots your parameter feeding into the script has a dotted line, that indicates a precondition and not a parameter feeding into the script tool. Did you create a parameter for the script tool? It's not enough to write code that accepts a parameter you need to actually define them in the properties of the tool so they expose as inputs to the tool in modelbuilder.

import arcpy
arcpy.AddToolbox("C:/Temp/PreProcess.tbx")
AuxNum = arcpy.GetParameterAsText(0)
if (AuxNum == '1'):
    arcpy.aux1_PreProcess()
elif (AuxNum == '2'):
    arcpy.aux2_PreProcess()

UPDATE

@Hornbydd See error in image below. Made slight spelling change to "...Preprocesses" in the code, I include the code as I entered it for this error message.

import arcpy
arcpy.AddToolbox("C:\Temp\PreProcesses.tbx")
AuxNum = arcpy.GetParameterAsText(0)
if (AuxNum == '1'):
    arcpy.Aux1_PreProcesses()
elif (AuxNum == '2'):
    arcpy.Aux2_PreProcesses()