I have a custom model (called TOOLNAME) in a custom toolbox developed in Model Builder on ArcGIS 10.1 Desktop. The model takes two input parameters (SingleFDI_D and dayindex) and outputs a Derived parameter called "MaxFDI_DateTime" which is data of String type.

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The model runs well within the ModelBuilder on ArcGIS Desktop. It returns the result MaxFDI_DateTeime: 22/11/2017 12:00:00 AM as below.

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I will need to run the model in Python.

How do I get the output of MaxFDI_DateTime out of the tool execution in Python?

# The custom model should return a String, how to retrieve it here?
model_result = arcpy.{TOOLNAME}_{TOOLBOX_ALIAS}(SingleFDI_D, str(day))

1 Answer 1


In your code snippet model_result is a Result object.

Without testing I think the string you are after can be printed from that using:



  • Thanks! If the code snippet has multiple (i) output params, we could potentially use model_result.getOutput(i-1)?
    – alextc
    Nov 23, 2017 at 0:28
  • That's what I would try.
    – PolyGeo
    Nov 23, 2017 at 1:02

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