Call python via command line from php

.htaccess

Options +SymLinksIfOwnerMatch
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^((?!index\.php).+)$ /index.php?py=$1 [NC,L,QSA] 

example.py

import sys, json

def main(args):
    return args

if __name__=="__main__":
    args={}
    k=""
    for a in sys.argv[1:]:
        if a.startswith("-"):
            k=a.strip("-")
        else:
            args[k]=a
    try:
        output = main(args)
    except Exception as e:
        output={"exception": type(e).__name__, "message": str(e)}                                                                        if type(output)!=str:
        output=json.dumps(output)
    print(output)

index.php

<?php
if ((!array_key_exists('py',$_GET)) || (!file_exists($_GET['py'].'.py')))
{
    header('Location: http://www.argmax.ml/');
    die();
}
$py = $_GET['py'];
if ((strpos($py, ' ') !== false) || (strpos($py, '.') !== false)) {
    header('Location: http://www.argmax.ml/');
    die();
}

$args='';
foreach ($_REQUEST as $key => $value) {
    if ($key!='py')
    {
            $value=escapeshellarg($value);
            $key=escapeshellarg("--".$key);
            $args.=" $key $value";
    }
}
header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");
header('Content-Type: application/json');

echo exec("/bin/python $py.py $args");