Listening to stdout from the Linux console with python3

Question

I’m trying to make a script in python that I need to hear the stdout linux console. The script is to test serial transmission error rate for image recording of an OS on an iMX collibri card, as there are some inconsistencies in serial TX/RX recording, mainly of timeout.

The script works perfectly, however, I found no way to hear the stdout console without running a file/script or process using the module subprocess python with the function Popen(). The code that captures stdout from a file is as follows: cmd the exit of a echo or script/arquivo :

import subprocess
import sys


def run(cmd):
    proc = subprocess.Popen(cmd,
                            stdout=subprocess.PIPE,
                            stderr=subprocess.PIPE,
                            )
    stdout, stderr = proc.communicate()

    return proc.returncode, stdout, stderr


code, out, err = run([sys.executable, 'run.py'])

print("out: '{}'".format(out))
print("err: '{}'".format(err))
print("exit: {}".format(code))

What I need to do is listen to stdout from the console at runtime, without having to run something before - script/file - to generate an stdout output. But I don’t know if it’s possible to do that.

Thanks!