sched_test.py

import sched
import threading
import time

class test(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)
        self.setDaemon(True)
    
    def run(self):
        while True:
            time.sleep(5)
            l.append(None)
            print l

def mysleep(sleep):
    time.sleep(1)

l = list()
def len_list(): return int(len(l))
def print_len(): print len(l)

s = sched.scheduler(len_list, mysleep)

t = test()
t.start()

print "OK."

s.enter(3, 1, print_len, ())
s.run()

print "Exit."