Batch Apply Symbology from one layer to another in multiple maps within an aprx

Ron_S1

Hi!

I am trying to develop a script to batch apply symbology from one source layer to another layer in multiple maps within an .aprx. I have a feature class that's being used in different map layouts, and I want to find a way to apply the symbology without having to go through each layout.

Attached below is my working script. It does run without error, but it does not do anything.

Thank you!

import arcpy

def main():
# Get parameters from ArcGIS Pro script tool
    source_map_name = arcpy.GetParameterAsText(0)        # Map with the styled source layer
    source_layer_name = arcpy.GetParameterAsText(1)      # Name of the styled layer
    target_map_names = arcpy.GetParameterAsText(2).split(";")  # Other maps to apply to

    aprx = arcpy.mp.ArcGISProject("CURRENT")

# Find the source map
    source_map = next((m for m in aprx.listMaps() if m.name.strip().lower() == source_map_name.strip().lower()), None)
if not source_map:
        arcpy.AddError(f"❌ Source map '{source_map_name}' not found.")
return

    # Find the source layer
    source_layer = next((lyr for lyr in source_map.listLayers() if lyr.name.strip().lower() == source_layer_name.strip().lower()), None)
if not source_layer:
        arcpy.AddError(f"❌ Source layer '{source_layer_name}' not found in map '{source_map_name}'.")
return

    symbology_applied = False  # Flag to track if we made changes

    for map_name in target_map_names:
        m = next((m for m in aprx.listMaps() if m.name.strip().lower() == map_name.strip().lower()), None)

if not m:
            arcpy.AddWarning(f"⚠ Map '{map_name}' not found. Skipping.")
continue

        target_layer = next((lyr for lyr in m.listLayers() if lyr.name.strip().lower() == source_layer_name.strip().lower()), None)
        arcpy.AddMessage(f" Found target layer '{target_layer.name}' in map '{map_name}'.")

if not target_layer:
            arcpy.AddWarning(f"⚠ Layer '{source_layer_name}' not found in map '{map_name}'. Skipping.")
continue

        try:
            arcpy.management.ApplySymbologyFromLayer(target_layer, source_layer)
            arcpy.AddMessage(f"✅ Symbology applied to layer '{source_layer_name}' in map '{map_name}'.")
            symbology_applied = True
        except Exception as e:
            arcpy.AddWarning(f"❌ Failed to apply symbology in map '{map_name}': {e}")

if symbology_applied:
        aprx.save()
        arcpy.AddMessage(" Changes saved to project.")

if __name__ == "__main__":
    main()

 

RTPL_AU

I use XTools to copy / paste symbology , def queries, etc (when 3.5.1 allows me to copy anything without freezing) as needed from one layer to many other layers so the concept definitely should work if it is exposed properly. 

Not a developer so any suggestions may be well off track but is your source layer in a group by any chance?