#!usr/bin/env python
from __future__ import absolute_import, division, print_function, unicode_literals

import subprocess


p = subprocess.Popen(
    ['python2.7', 'slave.py'],
    stdin=subprocess.PIPE,
    stdout=subprocess.PIPE,
)

while True:
    p.stdin.write("0\n")
    p.stdin.flush()
    response = p.stdout.readline().strip()
    print("main get {}".format(response))
    if int(response) == 0:
        break