Description
Problem
We encountered an error with calculator execution right off the bat like this:
Traceback (most recent call last):
File "<string>", line 111, in execute
File "C:\Users\User.Name\AppData\Local\ESRI\conda\envs\CornellCulvertTool\Lib\site-packages\drainit\workflows.py", line 543, in __init__
self.save_config_json_filepath = f'{self.gp._so("drainit_config", suffix="", where="folder")}.json'
File "C:\Users\User.Name\AppData\Local\ESRI\conda\envs\CornellCulvertTool\Lib\site-packages\drainit\services\gp\_esri\__init__.py", line 171, in _so
location = Path(env.scratchFolder)
File "C:\Users\User.Name\AppData\Local\ESRI\conda\envs\CornellCulvertTool\Lib\pathlib.py", line 1082, in __new__
self = cls._from_parts(args, init=False)
File "C:\Users\User.Name\AppData\Local\ESRI\conda\envs\CornellCulvertTool\Lib\pathlib.py", line 707, in _from_parts
drv, root, parts = self._parse_args(args)
File "C:\Users\User.Name\AppData\Local\ESRI\conda\envs\CornellCulvertTool\Lib\pathlib.py", line 691, in _parse_args
a = os.fspath(a)
TypeError: expected str, bytes or os.PathLike object, not NoneType
Failed to execute (CulvertCapacityPytTool).
The error was that arcpy.env.scratchFolder was returning None. This folder is relied on for temporary file i/o.
Cause
It looks like the global environment setting in ArcGIS Pro for the scratch workspace has to be set explicitly to a folder. That setting is here:
It can not be set using a Model Builder-style variable, e.g., %my_scratch_folder%.
That was the issue in this particular case.
Solution
For end-users
Set the scratch workspace explicitly. It's not clear if model builder variables are supported as global environment settings.
In the codebase
We should fall back to the system temp directory if the configured ArcGIS Pro scratch folder/workspace isn't available for some reason. That change would happen in the scratch output path generator function: