inputLayer = r"...\testLayer.lyr" targetLayerName = (arcpy.mapping.Layer(inputLayer)).name fields = arcpy.ListFields(inputLayer) lyrList = [] for item in fields: if ((item.name).split('.'))[0] not in lyrList: lyrList.append(((item.name).split('.'))[0]) for lyr in lyrList: if lyr != targetLayerName: print 'Join Layer: '+lyr