"""Example code using Python threads. Copyright 2010 Allen B. Downey License: GNU GPLv3 http://www.gnu.org/licenses/gpl.html """ from threading import Thread from time import sleep def counter(xs, delay=1): for x in xs: print x sleep(delay) # one thread counts backwards, fast t = Thread(target=counter, args=[range(100, 1, -1), 0.25]) t.start() # the other thread count forwards, slow counter(range(1, 100), 1)