This took me a little bit of effort to figure out so thought I would share.
When executing a Python script within a KM macro, it is well documented how to use a KM Variable's value in a Python script see here.
Unfortunately, it is not supported natively to send information back to KM using Python to set a KM Variable's value from within the Python script. It can be done using AppleScript from within the Python script but I have not seen any code examples so I thought I would include one:
import subprocess
# insert your python script here
python_output = "Data that you want to set a KM variable to."
applescript_command = f"""osascript -e 'tell application "Keyboard Maestro Engine" to setvariable "km_variable_name" to "{python_output}"'"""
subprocess.run(applescript_command, shell=True)
Hope that helps someone!
