Reading STDOUT of subprocess

Question

Hello I want to read output of command which gives progress bar like output as show below

10% |****                       | 3:56 ETA

I tried with following code

import subprocess
import sys
proc = subprocess.Popen("command", shell=True, stdout=subprocess.PIPE)
while True:
    line = proc.stdout.readline()
    if not line:
        break
    split = line.rstrip()
    print line
    print "\n"
print "Done"

This code reads output after completion of progress bar to 100%, but I want to read it at intermediate. Can any one help?

Answer 1

You're using readline() but the progress bar is all printed on one line, so readline() waits until the progress bar has been fully printed, as that is when a line break occurs. Try read(1) to get a character at a time.