import multiprocessing import time def func(msg): for i in xrange(3): print msg time.sleep(1) return "done " + msg if __name__ == "__main__": pool = multiprocessing.Pool(processes=4) result = [] for i in xrange(10): msg = "hello %d" %(i) result.append(pool.apply_async(func, (msg, ))) pool.close() pool.join() for res in result: print res.get() print "Sub-process(es) done."