Why sys.exit does not exit ?

[Giorge]

Hi all, here is a small code snippet that should
tell something about what I'm trying to do:

import sys, os, thread, time
from threading import *

def quit ():
    print "10 seconds passed. We should exit right now !"
    sys.exit(0)
    
# main program:
t = Timer (10.0, quit )
t.start()
sleep(20)

The problem here is that the sys.exit call doesn't
terminate the program, which exits after the sleep
call.

Can you help ? thanks.