I am trying to get my first python/arcpy script going, but I am stuck with implementing it into ArcGIS Pro. If my script is running inside the ArcGIS Pro Python-Window everything is executed well and a new Layer is added to the workspace. But if I try to use it as a tool via geoprocessing with editable input and output the script still executes without any errors but no new layer with the desired data appears inside the GDB/workspace. I need to implement it as a tool to be able to use it as part of an existing ModelBuilder process.

This is the attribute table of the layer, which I want to edit with the script:

FID Shape object drain
1 point 44_6547/2 [55.27517, -142.08384] ; [-71.56405, 5.49818]
2 point 44_6543/6 [45.58417, -50.15136] ; [-40.11681, 5.49818] ; [-28.57185, 128.38152] ; [-48.65803, -78.15412]
3 point 44_6894/5 [9.51578, -20.82284] ; [3.92250, 78.47350]; [-12.93206, 130.76959]
4 point 44_6594/2 [33.01124, -85.81893]

This is my arcpy script:

import arcpy

# input_layer = arcpy.GetParameterAsText(0)
# output_layer = arcpy.GetParameterAsText(1)

input_layer = 'C:/Users/... local path .../layer/testLayer.shp'

workspace = arcpy.env.workspace
new_layer = arcpy.CreateFeatureclass_management(workspace,'_GetLatLng','POINT')
arcpy.AddField_management(new_layer, 'object', 'STRING', field_length = 255)
arcpy.AddField_management(new_layer, 'lat', 'FLOAT', field_length = 50)
arcpy.AddField_management(new_layer, 'lng', 'FLOAT', field_length = 50)
fields_insert = ['object', 'lat', 'lng']
insert_cursor = arcpy.da.InsertCursor(new_layer, fields_insert)

fields_search = ['Shape', 'object', 'drain']
search_cursor = arcpy.da.SearchCursor(input_layer, fields_search)

for x in search_cursor:
    a = x[2].split(' ; ')
    for i in a:
        e = i.split(', ')
        lat = e[0].lstrip('[')
        lng = e[1].rstrip(']')       
        insert_cursor.insertRow((x[1], float(lat), float(lng)))

del search_cursor, insert_cursor

This is how I tried to setup the tool in ArcGIS Pro:

ArcGIS Pro tool screenshot

Updated code part after comment from @gotchula

inFC = arcpy.GetParameterAsText(0)
outFC = arcpy.GetParameterAsText(1)

workspace = arcpy.env.workspace
spatial_ref = arcpy.Describe(inFC).spatialReference
testedFC = arcpy.ValidateTableName(outFC, workspace)
newFC = arcpy.CreateFeatureclass_management(workspace, testedFC, 'POINT', spatial_ref)

But now I receive an error message about the newFC line.

My desired input type is Feature-Class in File-Geodatabase and my output could either be a feature-class or feature-layer. Does this has to match with the datatypes I declare in the tool properties? Because if I declare Feature-Class instead of Feature-Layer there appear no choices in the list when running the tool...

  • I doubt that it worked at all, because it's Shape@, not shape.
    – FelixIP
    Nov 20, 2021 at 20:50
  • was a typo... edited it
    – jonsken
    Nov 21, 2021 at 17:02
  • You are creating table not feature class. No geometry field, no attempt to populate it.
    – FelixIP
    Nov 21, 2021 at 18:14
  • 1
    Please never just say "I receive an error message about..." Always include the full error message (not just the last line) as text in your question.
    – user2856
    Nov 28, 2021 at 3:35

1 Answer 1


with regards to adding layers to the active map, the gp framework logic is like this: once a gp tool completes it's processing (aka: script execution) the gp framework iterates over all output parameters, if the dataType of that parameter is one that can be added to a map (say raster, feature class or table) and that parameter has a value (path to an existing dataset) then add that dataset to the map.

Other dataset created during the tool processing that are not associated with an output parameter will not be added to the active map.

So what I think you're missing is an parameter with these properties: direction=output, dataType=FeatureClass. This is something you're want anyways since it gives control to the user of the tool as to where the output feature class will be created and what name it will have. Additionally this allows the output of the tool to be chained into another tool in modelBuilder.

After adding the parameter to the tool you'll want to update your script to catch and use the value

outfc = arcpy.GetParameterAsText(1)
fcWorkspace, fcName = os.path.split(outfc)
arcpy.CreateFeatureclass_management(fcWorkspace, fcName, ...)

Another best practice which I would recommend is when creating the output feature class, set an appropriate spatial reference, else the feature class' storage parameters will likely cause you some problems later on.

edit: reworked the text a bit for clarity, and based on follow on comments below.

  • I tried to adjust my code to your input @gotchula, but I now receive an error message... I added to updated part in my question above
    – jonsken
    Nov 20, 2021 at 13:10
  • could it be related to my filetypes, that there occurs an error? I added the filetypes to my edit in the question as well
    – jonsken
    Nov 20, 2021 at 14:53
  • 1
    if parameter 1's dataType is FeatureClass, the value entered by the user will be the full path to the fc. So you'd want something like fcWs, fcName = os.path.split(outFC) then do arcpy.CreateFeatureclass_management(fcWs, fcName, ...)
    – gotchula
    Nov 26, 2021 at 0:07

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