#!/usr/bin/python3

import subprocess
import os

def run_command():
    p = subprocess.Popen("./command.py",
                         stdout=subprocess.PIPE,
                         stderr=subprocess.STDOUT,
                         universal_newlines=False)  # \r goes through

    nice_stdout = open(os.dup(p.stdout.fileno()), newline='')  # re-open to get \r recognized as new line
    for line in nice_stdout:
        yield line, p.poll()

    yield "", p.wait()


for l, rc in run_command():
    print(l, end="", flush=True)