subprocess.Popen for lively data reading?

[gontajones]

You can do this using threads:

import subprocess
import os
from threading import Thread


def std_output(pipe):
    with pipe:
        for line in iter(pipe.readline, b''):
            print('o ' + str(line))


def err_output(pipe):
    with pipe:
        for line in iter(pipe.readline, b''):
            print('e ' + str(line))


my_cmd = ['ping', 'www.google.com']

p = subprocess.Popen(
    my_cmd,
    stdout=subprocess.PIPE,
    stderr=subprocess.PIPE,
    bufsize=1,
    preexec_fn=os.setsid
)

th_out = Thread(target=std_output, args=(p.stdout,))
th_err = Thread(target=err_output, args=(p.stderr,))
th_out.start()
th_err.start()