How to run python script from php on xampp which is installed on windows?

Question

PHP

there are two files e:\xampp\htdocs\script\test.php and e:\xampp\cgi-bin\test.py
the python program is here c:\Python27\python.exe
test.py

#!/Python27/python
    print "Content-type: text/plain\n\n"
    print "Hello world"

test.php

$python =  exec('python e:\xampp\cgi-bin\test.py');
  echo "Python is printing: " .  $python;

This code does not run ((
How to run it correctly so that the text is displayed?