A tiny coroutine example in python

coro.py

#########################################################
#                                                       #
# Copyright 2013 Christopher Abiad All rights reserved. #
#                                                       #
#########################################################

__author__ = 'Chris Abiad <chris@chrisabiad.com>'

def f1():
    while True:
        print "waiting for value from <generator object>.send()"
        next_val = yield
        print "yielding received value {}".format(next_val)
        yield next_val

if __name__ == '__main__':
    y = f1()
    y.next()
    for i in range(5):
        print "send()ing {}".format(i)
        val = y.send(i)
        print "got back yielded val {}".format(val)