Combining symbol classes using Arcpy

OllyD — Thu, 18 May 2023 08:01:39 GMT

Hello,

I'm trying to write a test script which looks at a layers attributes and then applies different colours based on a given attribute. This is the script I have so far:

import arcpy aprx = arcpy.mp.ArcGISProject("CURRENT") aprxMap = aprx.activeMap lyr = aprxMap.listLayers('Q_ARCHAEOLOGY')[0] sym = lyr.symbology sym.updateRenderer('UniqueValueRenderer') sym.renderer.fields = ['LAYER_NAME'] for grp in sym.renderer.groups: for itm in grp.items: attrVal = itm.values[0][0] if attrVal == "ARCH_LAYER": itm.symbol.color = {"RGB": [249, 30, 22, 100]} # red itm.symbol.outlineColor = {"RGB": [0, 0, 0, 0]} # null colour for symbol outline itm.symbol.size = 5 itm.label = str("layer") elif attrVal == "ARCH_PRE_EX": itm.symbol.color = {"RGB": [78, 247, 30, 100]} # green itm.symbol.outlineColor = {"RGB": [0, 0, 0, 0]} # null colour for symbol outline itm.symbol.size = 5 itm.label = str("preex") elif attrVal == "ARCH" or attrVal == "ARCHAEOL": itm.symbol.color = {"RGB": [70, 207, 50, 100]} # green itm.symbol.outlineColor = {"RGB": [0, 0, 0, 0]} # null colour for symbol outline itm.symbol.size = 5 itm.label = str("arch") lyr.symbology = sym aprx.save()

Whilst for the most part this script works the issue I have is that it creates two symbol classes labelled "arch", whilst I want the attributes ARCH and ARCHAEOL combined into one symbol class for the purpose of legend tidiness on figures.

How do I combine these into one class? Is there a way replicate an Arcade expression combining the two in python?

Thanks

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Combining symbol classes using Arcpy