os.fork demo

fork.py

import os
import time

print("forking...")
pid = os.fork()
print("done!")
if pid == 0:
    print("hello, I am the child")
else:
    print("hello, I am the parent")
print("and we work simultaneously")
print("and when the parent dies, a prompt appears")
if pid == 0:
    print("child: still alive")
    time.sleep(1)
    print("child: alive and kickin'")
    time.sleep(5)
    print("child: goodbye")
else:
    print("parent: goodbye")