t.py

import threading
import time

def bug(num):
	while 1:
		print "bug!^C may not work!thread-%d"%num
		time.sleep(1)

threads=[] 

for i in range(4):
	th = threading.Thread(target=lambda : bug(i))
	th.daemon = True
	threads.append(th) 

try:
	for th in threads: 
		th.start()
	while True: time.sleep(100)
except (KeyboardInterrupt):
	print "Quitting"