read subprocess stdout line by line

Question

My python script uses subprocess to call a linux utility that is very noisy. I want to store all of the output to a log file and show some of it to the user. I thought the

Answer 1

The following modification of Rômulo's answer works for me on Python 2 and 3 (2.7.12 and 3.6.1):

import os
import subprocess

process = subprocess.Popen(command, stdout=subprocess.PIPE)
while True:
  line = process.stdout.readline()
  if line != '':
    os.write(1, line)
  else:
    break