Comunicate python process with asyncronush calls with nodejs

comunite python with nodejs asynchronous.js

var spawn = require('child_process').spawn,
    ls    = spawn('python',['-u','python.py']);

ls.stdout.on('data', function (data) {
    console.log('stdout: ' + data);
});

ls.stderr.on('data', function (data) {
    console.log('stderr: ' + data);
});

python.py

import sys                                                                       
from datetime import datetime                                                    
from time import sleep                                                           
                                                                                  
for x in range(1, 5):                                                            
    print(datetime.now())                                                       
    sleep(1)