topic Re: Something simple that I can't seem to troubleshoot? in Python Questions

Something simple that I can't seem to troubleshoot?

RPGIS — Thu, 09 Sep 2021 14:02:41 GMT

Hi,

I am currently working on a custom python tool that works until a certain point. The issue that I am having, and it is probably really simple but I can't seem to trouble shoot, is specifying the feature class using os.path.join method (unless I configured this wrong but running a random test proves otherwise).

The input workspace is set by a created gdb derived from one of the user inputs. Everything works until this point and I am now at a standstill. Any help on this would be greatly appreciated.

import arcpy Project_GDB = 'input random gdb' SubBoundaryFC_Name = 'SubdivisionBoundary' SubdivisionFC = os.path.join(Project_GDB, SubBoundaryFC_Name) SubBoundary = arcpy.management.FeatureToPolygon(FCs_forSubdivisionBoundary, SubBoundaryFC_Name) arcpy.AddMessage('{} has been created.'.format(SubBoundary))

Re: Something simple that I can't seem to troubleshoot?

David_Brooks — Thu, 09 Sep 2021 14:08:49 GMT

@RPGIS you haven't declared this variable:

FCs_forSubdivisionBoundary

Re: Something simple that I can't seem to troubleshoot?

Anonymous User — Thu, 09 Sep 2021 14:21:54 GMT

It can be tricky trying to troubleshoot script tools but there are some ways you can get error messages.

import arcpy Project_GDB = 'input random gdb' try: SubBoundaryFC_Name = 'SubdivisionBoundary' SubdivisionFC = os.path.join(Project_GDB, SubBoundaryFC_Name) # As Brooks mentioned, should SubdivisionFC be FCs_forSubdivisionBoundary below? SubBoundary = arcpy.management.FeatureToPolygon(FCs_forSubdivisionBoundary, SubBoundaryFC_Name) arcpy.AddMessage('{} has been created.'.format(SubBoundary)) except: arcpy.AddError(arcpy.GetMessages(2))

or if you want to test the script in an IDE as a standalone/script tool script and use env.workspace:

import arcpy Project_GDB = arcpy.GetParametersAsText(0) # value assigned when ran as script tool if Project_GDB == '' or not Project_GDB: Project_GDB = 'input random gdb' # default value for standalone SubBoundaryFC_Name = arcpy.GetParametersAsText(1) if SubBoundaryFC_Name == '' or not SubBoundaryFC_Name: SubBoundaryFC_Name = 'SubdivisionBoundary' try: arcpy.env.workspace = Project_GDB # if the target fc's are in the project_gdb, you should be able to reference them by name and not have to use os.path.join if you set your env.workspace SubBoundary = arcpy.management.FeatureToPolygon("FCs_forSubdivisionBoundary", SubBoundaryFC_Name) arcpy.AddMessage('{} has been created.'.format(SubBoundary)) except: arcpy.AddError(arcpy.GetMessages(2))

Re: Something simple that I can't seem to troubleshoot?

BlakeTerhune — Thu, 09 Sep 2021 14:53:10 GMT

@Anonymous User has some good suggestions for error handling. I want to point out that the except like that will catch all exceptions but will only attempt to output specifically arcpy geoprocessing errors. A more well rounded solution would be a specific except and a general except for everything else.

Error handling with Python—ArcGIS Pro | Documentation

Re: Something simple that I can't seem to troubleshoot?

MichaelVolz — Thu, 09 Sep 2021 15:45:21 GMT

I would suggest adding print statements for variables to ensure that they are being populated as expected.

Re: Something simple that I can't seem to troubleshoot?

RPGIS — Thu, 09 Sep 2021 17:17:56 GMT

I accidently left out of the snippet for this little piece here by mistake.

FCs_forSubdivisionBoundary = []

It is derived from using walk to append each feature class in the database based on matching names.

Re: Something simple that I can't seem to troubleshoot?

BlakeTerhune — Thu, 09 Sep 2021 19:09:42 GMT

Are you getting a particular error message? If so, please paste the entire traceback if you can. Is everything in FCs_forSubdivisionBoundary a line or polygon feature class? Also, try using SubdivisionFC as the out_feature_class for FeatureToPolygon() instead of SubBoundaryFC_Name (because no workspace is specified).

Re: Something simple that I can't seem to troubleshoot?

RPGIS — Thu, 09 Sep 2021 19:28:45 GMT

Hi @BlakeTerhune,

Here is the error message that I keep getting when it runs.

Failed script Import Test... Traceback (most recent call last): File "*:\CAD Exporting Test\Default.tbx#ImportTest_Default.py", line 207, in <module> File "*:\CAD Exporting Test\Default.tbx#ImportTest_Default.py", line 183, in ScriptTool File "*:\''\''\AppData\Local\Programs\ArcGIS\Pro\bin\Python\envs\arcgispro-py3\Lib\ntpath.py", line 76, in join path = os.fspath(path) TypeError: expected str, bytes or os.PathLike object, not Result Failed to execute (ImportTest).

Not sure what this error refers to but I can't seem to bypass it for some reason. I am thinking that the issue is either a syntax issue or an output error.

Re: Something simple that I can't seem to troubleshoot?

BlakeTerhune — Thu, 09 Sep 2021 20:11:46 GMT

That error means you're taking a Result object (output from a geoprocessing tool) and inputting it directly into something else without unpacking it.

I can't say exactly where it's happening since we don't have the whole script but look on line 183. Something there is getting a result object when it should be getting something more specific (like a string path to a feature class).

Re: Something simple that I can't seem to troubleshoot?

RPGIS — Fri, 10 Sep 2021 11:55:50 GMT

Hi @BlakeTerhune,

So I figured out the issue with part of the script that was giving me issues.

#Check to see if the following project already exists. If project exists, overwrite the existing project. Project_GDB = '' for root, directory, files in os.walk(folder_location): GDB = os.path.split(root)[-1] if GDB == ProjectGDB: Project_GDB = root else: Project_GDB = arcpy.management.CreateFileGDB(folder_location, Project)

Further in the script I converted the output to a string and then utilized the os.path.join which worked as intended.

SubBoundaryFC_Name = 'SubdivisionBoundary' SubdivisionFC = os.path.join(str(Project_GDB), SubBoundaryFC_Name) SubBoundary = arcpy.management.FeatureToPolygon(FCs_forSubdivisionBoundary, SubdivisionFC) arcpy.AddMessage('{} has been created.'.format(SubBoundaryFC_Name))

So this simple solution was really all I needed. Here is the message result that it generated.

SubdivisionBoundary has been created.