import threading
import time

def clock(interval):
        print("The time is %s" % time.ctime())
        time.sleep(interval)

t0 = threading.Thread(target=clock, args=(8,))
t1 = threading.Thread(target=clock, args=(13,))
t2 = threading.Thread(target=clock, args=(16,))
t3 = threading.Thread(target=clock, args=(5,))
t0.start()
t1.start()
t2.start()
t3.start()

threads = [t0, t1, t2, t3]