parallel python subprocesses with interleaved writing to stdout

child1.py

import time


if __name__ == '__main__':
    print('child 1 reporting for work')
    time.sleep(10)
    print('child 1 done working')

child2.py

import time


if __name__ == '__main__':
    print('child 2 reporting for work')
    time.sleep(10)
    print('child 2 done working')

Parallel_subprocesses.md

Usage

Make two child processes do 10 seconds of work each in parallel, reporting their output to stdout in an interleaved fashion:

$ python parent.py
child 1 reporting for work
child 2 reporting for work
child 1 done working
child 2 done working

parent.py

import subprocess


if __name__ == '__main__':
    c1 = subprocess.Popen('python child1.py', shell=True)
    c2 = subprocess.Popen('python child2.py', shell=True)
    c1.wait()
    c2.wait()