Programmatically access user's Esri Python path

Question

I'm creating a CoreHost app that needs to be able to call ArcPy scripts. To do this, we need (from what I understand) to know the local machine's python path - specifically the path of the python .exe installed with Arc Pro.

I've accomplished this on my development machine by just hardcoding the path to the ArcGIS directory in Program Files - but how can we get the appropriate executable without knowing where and how the user has installed Arc Pro?

DavidLaMartina · Answer

Thank you Wolfgang Kaiser‌. For others interested, this is the code I used to grab the path from the registry key Wolfgang provided:

RegistryKey arcGISProInstallDirectoryKey = Registry.LocalMachine.OpenSubKey(@SOFTWARE\ESRI\ArcGISPro);
 object pythonDirectoryKeyValue = arcGISProInstallDirectoryKey.GetValue("PythonCondaRoot");
 string pythonDirectoryPath = pythonDirectoryKeyValue.ToString();

string localExecutablePath = @Scripts\propy.bat;
 string pythonExeutablePath = Path.Combine(pythonDirectoryPath, localExecutablePath);

danretired · Answer

This works on a local machine, I don't know how you can access that information on another machine import sys sys.executable 'C:\arc_pro\bin\Python\envs\arcgispro-py3\python.exe'‍‍‍‍‍‍ In my case, arcgis pro is installed in the c:\arc_pro folder Addendum which yields the same as the registry if you parse the \envs... onward off

Wolf · Answer

You can use the registry path HKEY_LOCAL_MACHINE\SOFTWARE\ESRI\ArcGISPro\PythonCondaRoot to retrieve the python root folder used by Pro.