Had the same problem

Let me show you what I did

PHP :

base64_encode(json_encode($bodyData))

then

json_decode(shell_exec('python ' . base64_encode(json_encode($bodyData)) );

and in Python I have

import base64

and

content = json.loads(base64.b64decode(sys.argv[1]))

as Em L already mentioned :)

It works for me Cheers!

Copy    $jsonArr = array();
    foreach($periodi as $key => $val){
        $jsonArr[$key]['name'] = $val;
        $jsonArr[$key]['data'] = $key; //there is no source for priority 
          //in your array so i just put $key as priority variable
    }

    json_encode($jsonArr);

If your array isn't too exotic, your JSON idea should actually work just fine. I built a little python script (test.py) to feed the php script (test.php):

test.py:

import json
print json.dumps([['a','b','c'], ['d','e','f']]);

test.php:

<?php
$command = escapeshellcmd('python test.py');
$output = shell_exec($command);
echo $output;
$arr = json_decode($output);
var_dump($arr);
?>

Thank you all for comments! According to that, I kind figure out solution.

Python script

data = {}
for result in results:
    if 'stackoverflow.com' in result['serp_url']:
        data['url'] = result['serp_url']
        data['rank'] = result['serp_rank']
        data['query'] = result['query']
        print(json.dumps(data))
        exit

PHP script

exec("python3 py.py", $output);

$test = [];

foreach($output as $key => $out) {
    $test[$key] = json_decode($out, true);
    print_r("Rank: " . $test[$key]['rank'] ." - ". $test[$key]['url']."<br>");
}

Output

Rank: 1 - https://stackoverflow.com/
Rank: 36 - https://www.quantcast.com/stackoverflow.com

If you pass the JSON in your post to json_decode, it will fail. Valid JSON strings have quoted keys:

json_decode('{foo:"bar"}');         // this fails
json_decode('{"foo":"bar"}', true); // returns array("foo" => "bar")
json_decode('{"foo":"bar"}');       // returns an object, not an array.

You creating invalid json by adding apiBlockTicketRequest to output

 $json='apiBlockTicketRequest'.$data;

instead you can do

$json = json_encode(['apiBlockTicketRequest' => $prebook]);