How to get distinct data sources of layers and tables in ArcGIS Pro project?

    aprx = arcpy.mp.ArcGISProject("CURRENT")
    maps = aprx.listMaps()
    for map in maps:
        print ('--------------------------------------------------------------')
        print (map.name)
        print ('--------------------------------------------------------------')
        layers = map.listLayers()
        tables = map.listTables()
        for layer in layers:
          print (layer.dataSource)
        for table in tables:
          print (table.dataSource)
  • 2
    Try creating a list of all of them, then use a set to remove duplicates - see stackoverflow.com/questions/7961363/…
    – PolyGeo
    Commented Feb 7, 2023 at 11:20
  • 1
    This isn't an ArcGIS Pro question, or even a GIS question, it is a basic Python programming question, and a quick search for finding unique values in a list yields numerous answers. The ArcGIS Pro aspect of this question is already answered How to get a list of all data sources used in a ArcGIS Pro project? - GIS SE
    – bixb0012
    Commented Feb 7, 2023 at 13:35
  • I'm newby to Python, so I can't figure it out by myself. Tried to use set, but it didn't worked in ArcPy, so maybe it's not generel Python question, but ArcPy's.
    – Fikusas
    Commented Feb 7, 2023 at 14:39
  • Please don’t ask follow up questions in the same question. Ask a new question and link to the original as context, if it’s relevant.
    – PolyGeo
    Commented Feb 10, 2023 at 10:18

1 Answer 1


List layer objects, extract their sources using dataSource property, convert to a set which can't have duplicates:

import arcpy

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

layers = [] #A list to hold layer objects

for mp in aprx.listMaps(): #For each map in the project
    for layer in mp.listLayers(): #Find all layers
    for table in mp.listTables(): #And tables
sources = [x.dataSource for x in layers] #Extract their sources
print(set(sources)) #Print unique sources

enter image description here


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