An attempt to Enable Symbol Layer Drawing with arcpy

nsidaniel — Thu, 16 Oct 2025 20:16:36 GMT

As part of larger process I'm trying to Enable Symbol Layer Drawing.

1. I tried using the CIM through the Layer class, which didn't work (I may have set it up wrong) and I foolishly deleted my code out of annoyance.

2. I also tried using the renderer (without the CIM):

sym = lyr.symbology sym.updateRenderer('UniqueValueRenderer') sym.renderer.enableSymbolLayerDrawing = True lyr.symbology = sym

3. Here's my full code currently:

import arcpy aprx = arcpy.mp.ArcGISProject("CURRENT") m = aprx.listMaps(map_name)[0] lyr = m.listLayers(layer_name)[0] cim_lyr = lyr.getDefinition("V3") for lblClass in cim_lyr.labelClasses: lblClass.expressionEngine = "VBScript" lblClass.expression = '"<FNT name=\'Arial\' style=\'Bold\' size=\'8\'><CLR red=\'255\' green=\'255\' blue=\'255\'>" & [ParcelID] & vbNewLine & [OpCo] & " " & [TypeOfUse] & "</CLR></FNT>"' if not lblClass.maplexLabelPlacementProperties: lblClass.maplexLabelPlacementProperties = arcpy.cim.CreateCIMObjectFromClassName('CIMMaplexLabelPlacementProperties', 'V3') lblClass.maplexLabelPlacementProperties.polygonFeatureType = "LandParcel" lblClass.maplexLabelPlacementProperties.polygonPlacementMethod = "StraightInPolygon" lblClass.maplexLabelPlacementProperties.preferHorizontalPlacement = True lblClass.maplexLabelPlacementProperties.multiPartOption = "OneLabelPerPart" lblClass.maplexLabelPlacementProperties.featureWeight = 0 lblClass.maplexLabelPlacementProperties.labelWeight = 0 lblClass.maplexLabelPlacementProperties.polygonBoundaryWeight = 0 lblClass.maplexLabelPlacementProperties.avoidOverlappingLabeledPolygonsAsIfHoles = True lblClass.maplexLabelPlacementProperties.canRemoveOverlappingLabel = False lblClass.maplexLabelPlacementProperties.canPlaceLabelOnTopOfFeature = True lblClass.maplexLabelPlacementProperties.canOverrunFeature = True lblClass.maplexLabelPlacementProperties.canPlaceLabelOutsidePolygon = False lblClass.maplexLabelPlacementProperties.backgroundLabel = True lblClass.visibility = True lblClass.priority = 0 sym = lyr.symbology sym.renderer.enableSymbolLayerDrawing = True lyr.showLabels = True m.enableMaplex = True lyr.symbology = sym lyr.setDefinition(cim_lyr) print(f" Label settings updated for {layer_name}")

Any ideas or thoughts are appreciated!

- Daniel

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An attempt to Enable Symbol Layer Drawing with arcpy