proper interruption with ctrl+c

gistfile1.py

#!/usr/bin/python

import Queue
import threading
import commands


def run_delay(delay):
        try:
                print "Start delaying: {0}".format(delay)
                result = commands.getoutput("sleep {0} && echo {0}".format(delay))
                print "Done delaying: {0}".format(result)
                return result
        except:
                print "Error sleeping {0}".format(delay)
        return None


def worker():
        while True:
                delay = q.get()
                if delay is None:
                        return
                run_delay(delay)
                q.task_done()                

##############

num_threads=5

q = Queue.Queue()

for i in range(num_threads):
        t = threading.Thread(target=worker)
        t.daemon = True
        t.start()

for item in [ 10, 30, 2, 4, 8, 1, 4, 2, 8, 3 ]:
        q.put(item)

q.join()
print "All gone"