From blog post: http://lextoumbourou.com/blog/posts/what-are-zombie-processes-unix/

fork_wait.py

from os import fork, getppid, wait
from sys import exit
from time import sleep

pid = fork()

if pid == 0:
    print "Hope my parent doesn't forget me this time!"
    for _ in range(3):
        sleep(1)
        print "Right now, my parent is", getppid()
else:
    wait()
    print "My child has finished processing. My work here is done."