Python output streaming

index.js

console.log('running');

var child = require('child_process').spawn('python', ['./index.py']);
child.stdout.on('data', function(data) {
  console.log('stdout: "' + data.toString().trim() + '"');
});
child.stderr.on('data', function(data) {
  console.log('stderr: ' + data);
});
child.on('close', function(code) {
  console.log('closing code: ' + code);
});

index.py

import time, sys

def step(name):
    print(name)
    sys.stdout.flush()  # the key
    time.sleep(1)

for name in ['five', 'four', 'three', 'two', 'one']:
    step(name)
print('blastoff!')