windows php exec apache -

windows 10, php 5.6 mod, apache 2 service

in browser dont see exec() return value

<?php exec("python c:\script.py", $output); var_dump($output); 

if change command using "python" smth "dir" works , return results

<?php exec("dir", $output); var_dump($output); 

if run python script command line works expected

> python c:\script.py 

if run php script command line works expected , exec return required results python script

> php -r "exec('python c:\script.py', $output); var_dump($output);" 

i suppose problem related apache permissions or php permissions python.exe ? may smth. else ?

advise me pls , explain how change permissions im not familiar windows not user friendly :d kidding :)