subprocess.Popen for lively data reading?

[gontajones]

I like to use this way to monitor output of a child process:

import subprocess
import os

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

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

with p.stdout:
    for line in iter(p.stdout.readline, b''):
        print('OUTPUT: ' + str(line))