Getting realtime output using subprocess

Question

I am trying to write a wrapper script for a command line program (svnadmin verify) that will display a nice progress indicator for the operation. This requires me to be abl

Answer 1

Real Time Output Issue resolved: I encountered a similar issue in Python, while capturing the real time output from C program. I added fflush(stdout); in my C code. It worked for me. Here is the code.

C program:

#include 
void main()
{
    int count = 1;
    while (1)
    {
        printf(" Count  %d\n", count++);
        fflush(stdout);
        sleep(1);
    }
}

Python program:

#!/usr/bin/python

import os, sys
import subprocess


procExe = subprocess.Popen(".//count", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)

while procExe.poll() is None:
    line = procExe.stdout.readline()
    print("Print:" + line)

Output:

Print: Count  1
Print: Count  2
Print: Count  3