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shell_exec — Execute command via shell and return the complete output as a string . [reference][1]

<?php
 if(isset($_POST['switch'])){
 $c=escapeshellcmd("sudo python /home/pi/Desktop/test.py");
 $res=shell_exec($c);
 echo $res; // returns result to display
 }
?>

in your script,output is not printed that may seem to not working

 <?php
 if(isset($_POST['switch'])){
 $s=exec("sudo python /home/pi/Desktop/test.py");
 echo "$s"; 
}
 ?>

EDIT:

add full path of interpreter in the first line of python script . if you have installed more than one python version

$s=exec("sudo -u /home/pi/Desktop/test.py"); this gives permission to python file

first of all make python file executable with chmod +x /path/to/python-script.py [1]: http://php.net/manual/en/function.shell-exec.php