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I currently have a Python 2.7 script that takes a hard-coded select by attribute from ArcMap 10.3.

arcpy.SelectLayerByAttribute_management("SoilLandscapePolygons_Layer", "NEW_SELECTION", "POLY_ID = 25984)

that then copies this polygon and its related tables into a new FGDB. What I want to do, is to have the user select a polygon and then have this polygon copied ... so that I can continue working on it in my script. I'm not doing any editing what so ever but I need this one polygon to begin working through the various relationship tables to create a summary for the selected polygon.

  • Look into using a Feature Set - there a few Q&As here about them – PolyGeo Feb 28 at 22:23
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    If you have a selection in ArcMap then only that selection is used by a geoprocessing tool, you should be able to comment out the line with SelectLayerByAttribute and export only the selected polygon. This is not true for Catalog where a selection must be made within the script. Beware though, if the layer doesn't have a selection when it is passed to your script then all polygons in the layer will be processed, there is no Layer.HasSelection to help decide if the layer has a selection before proceeding.. – Michael Stimson Feb 28 at 22:46
  • Gents - I have yet to see how to set up a feature set as part of a tool or as part of an addin. Any suggestions. Also, I agree that once there is a selected polygon, I just can't seem to figure out how to pass it to the script. – Layne Seely Feb 28 at 23:21
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    @MichaelStimson There's if arcpy.Describe (lyr).FIDSet: which will return True or False depending on if there's a selection on the layer. – Emil Brundage Feb 28 at 23:26
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    The fastest and simplest so far is layer.getSelectionSet (). Will return None or tuple of selected OIDs. – FelixIP Mar 1 at 0:54
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Working in the ArcMap environment you simply need to pass a string of the layer name into your copy code. Thus if the selection is manually done instead of with your SelectLayerByAttribute_management just skip this line of code and proceed with your Copy Features.

If you want to check for a selection first you can use FIDSet.

if arcpy.Describe ("SoilLandscapePolygons_Layer").FIDSet:
    ###copy features
else:
    print "no selection"
  • this is the error that I got "AttributeError: DescribeData: Method FIDSet does not exist" – Layne Seely Mar 1 at 0:07

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