import subprocess
import time
import os
from threading import Thread
from queue import Queue


def enqueue_output(proc, queue):
    while not proc.poll():
        line = proc.stdout.readline()
        queue.put(line)


def main(filepath):
    filepath = os.path.abspath(os.path.expanduser(filepath))
    proc = subprocess.Popen([filepath], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    queue = Queue()
    thread = Thread(target=enqueue_output, args=(proc, queue))
    thread.start()

    while True:
        if queue.qsize():
            line = queue.get(timeout=.1).decode("utf-8").strip()
            print(line)
        else:
            time.sleep(.5)


if __name__ == "__main__":
    main("sample.sh")