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You can see which application started Python by looking at sys.executable, which returns the executable that was used to start the Python session.

import os
import sys

def main():
    # Determine if this script is being run from PSSE or plain Python.
    full_path_executable = sys.executable
    # Remove the folder path and keep only the executable file (in lower case).
    executable = os.path.basename(full_path_executablefull_path_exec).lower()

    run_in_psse = True
    if executable in ['python.exe', 'pythonw.exe']:
        # If the executable was one of the above, it is a Python session.
        run_in_psse = False        

    if not run_in_psse:
        psspy.stop_2()
    else:
        # do something else to finish up.