Making python script results appear in ModelBuilder?

Question

I have a model (ModelBuilder) and within I added a python script to calculate a field. My problem now is, that I don't know how to make the output appear in my model as it is the same as the input (only with the field calculated).

I imagine there is a very simple way, but I am new to ModelBuilder and python and just can't think of it?

Alternatively, I could also try using the field calculator, but I would prefer it this way.

And here is my script:

import arcpy
from arcpy import env

env.workspace = arcpy.GetParametersAsText(0)  # the workspace
inLayer = arcpy.GetParameterAsText(1) # The shapefile
inField = arcpy.GetParameterAsText(2)  # The column in attr table with Area
outField = arcpy.GetParameterAsText(3) # The column in attr table which should be calculated

# Create a list from area field and find min & max value

listing = []
rows = arcpy.SearchCursor(inLayer)
for row in rows:
    listing.append(row.getValue(inField))
del rows

listing.sort()
min = listing[0]
max = listing[-1]

# Calculate the normalized value

rows2 = arcpy.UpdateCursor(inLayer)
for row2 in rows2:
    row2.setValue(outField, (max - row2.getValue(inField))/(max - min))
    rows2.updateRow(row2)
del rows2

Answer 1

You'll want to add your script as a tool in a custom Toolbox, then add your script tool into your ModelBuilder process.

When you create your script tool, be sure to set the script tool parameters up so that you have the Type parameter set to "Derived" with the Direction parameter set to "Output".