I'm trying to export Orders dataset after solving a Vehicle Routing Problem (VRP) into a shapefile using Python only. The problem is that apparently arcpy without mxd open doesn't recognise my VRP layer. Below is the code I'm working on:

outNALayer = arcpy.na.MakeVehicleRoutingProblemLayer (inNetworkDataset, 
outNALayer = outNALayer.getOutput(0)

#Get the names of all the sublayers within the VRP layer.
subLayerNames = arcpy.na.GetNAClassNames(outNALayer)
#Stores the layer names that we will use later
ordersLayerName = subLayerNames["Orders"]
depotsLayerName = subLayerNames["Depots"]
routesLayerName = subLayerNames["Routes"]
pairsLayerName = subLayerNames["OrderPairs"]

arcpy.na.AddLocations(outNALayer, ordersLayerName, inOrders, orderFieldMappings,"")

#List name of attributes in Depot layer
depotFieldMappings = arcpy.na.NAClassFieldMappings(outNALayer, depotsLayerName)
arcpy.na.AddLocations(outNALayer, depotsLayerName, inDepots, depotFieldMappings, "")

#List name of attributes in Route layer
routeFieldMappings = arcpy.na.NAClassFieldMappings(outNALayer, routesLayerName)
arcpy.na.AddLocations(outNALayer, routesLayerName, inRoutes,  routeFieldMappings, "")

#List name of attributes in Route layer
pairFieldMappings = arcpy.na.NAClassFieldMappings(outNALayer, pairsLayerName)
arcpy.na.AddLocations(outNALayer, pairsLayerName, inPairs,  pairFieldMappings, "")

arcpy.na.Solve(outNALayer, "SKIP")
arcpy.CopyFeatures_management(outNALayerName + r"\Orders", inOrders + '_' + str(iterator))

The error message is that the Orders does not exist or is not supported. I have tried saving the layer file on the disk and accessing Orders from that layer but get the same error. Is there a solution to access the actual sublayers within solved layer just in python. I think Select function is available in model builder only. Note: the above code runs just fine when is run in the mxd python window.

The error is at the last line. The error message is:

Traceback (most recent call last): File "C:\Users\zarem\OneDrive\Total_Transport_Home\Code\Vehicle Routing Problem_Only - Copy.py", line 143, in arcpy.CopyFeatures_management(outNALayerName + r"\Orders", inOrders + '_' + str(iterator)) File "C:\Program Files (x86)\ArcGIS\Desktop10.3\ArcPy\arcpy\management.py", line 2435, in CopyFeatures raise e ExecuteError: Failed to execute. Parameters are not valid. ERROR 000732: Input Features: Dataset VRP_Lyr_Grp_74\Orders does not exist or is not supported


1 Answer 1


I found the bit of code to access the sublayers within NA layer.

OrderSublayer = arcpy.mapping.ListLayers(outNALayer, "Orders")[0]

Hope this helps someone with same problem.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.