shell_exec on windows server, how to debug?

Question

I would like to run a Python script on a Windows Server (IIS) system with the PHP shell_exec("python hubbeldibubbel.py parameter). If I start the Python script normally via the console, the script works, but not via web access.

What can be the cause? How can I debug this?
The Python script should only write something to a txt file at the moment.
The php-script:

<?php
$string = $_SERVER['REQUEST_URI'];

$command = '"C:\\Users\\Administrator\\AppData\\Local\\Programs\\Python\\Python311\\Python.exe" C:\\inetpub\\vhosts\\...\\httpdocs\\nw.py ' . $string;


$output= shell_exec($command);
echo $output;

?>

The python script:

import sys


string = sys.argv[1]

datei = open('datei.txt','a')
datei.write("aaa" + string)
print(string)

I tried other php commands.

Answer 1

You miss one slash here AppData\Local, should be AppData\\Local.