Is there a way to poll a file handle returned from subprocess.Popen?

Question

Say I write this:

from subprocessing import Popen, STDOUT, PIPE
p = Popen([\"myproc\"], stderr=STDOUT, stdout=PIPE)

Now if I do

Answer 1

Use p.stdout.read(1) this will read character by character

And here is a full example:

import subprocess
import sys

process = subprocess.Popen(
    cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE
)

while True:
    out = process.stdout.read(1)
    if out == '' and process.poll() != None:
        break
    if out != '':
        sys.stdout.write(out)
        sys.stdout.flush()