Creo automation: start Creo with trail-file by e.g. python command

I want to do some automated Tasks in Creo controlled by a python script.

I prefer a simple solution without the need of extra Software (creoson / creopyson).

What works is to start Creo with a Batch file or from cmd with the Trail-file. (parametric.exe .psf Trail.txt)

But when I start Creo like this from within python, the Trail file is ignored. I don't know why.

I use the external Analysis and .csv files to change Parameters and get measurements. The csv-files are read/written with the python script.

Is there something in Creo, which blocks the Trail-file when started from python?

I think it would be the same, if I use a different programming language.

I've tried the following:

batch-file:

"C:\Program Files\ptc\Creo 4.0\M070\Parametric\bin\parametric.exe" "C:\Program Files\ptc\Creo 4.0\M070\Parametric\bin\parametric1.psf" M:\test_trail.txt

python commands:

start with batch file:

import os
import subprocess

os.chdir(pathlib.Path(r"C:\Program Files\ptc\Creo 4.0\M070\Parametric\bin"))
test = subprocess.Popen(r"M:\start_creo_with_trail.bat")

 start directly:

import os
import subprocess

os.chdir(pathlib.Path(r"C:\Program Files\ptc\Creo 4.0\M070\Parametric\bin"))
test = subprocess.Popen(["parametric.exe","parametric1.psf","M:\test_trail.bat"])