2009/6/29 MRAB <pyt...@mrabarnett.plus.com>: > superpollo wrote: >> >> hi folks. >> >> the follwing shoud print 'stuff' for 3 seconds and then stop. why it does >> not work? (prints stuff forever) >> >> 1 #!/usr/bin/python >> 2 >> 3 import threading >> 4 import sys >> 5 >> 6 t = threading.Timer(3.0, sys.exit) >> 7 t.start() >> 8 while True: >> 9 print "stuff ", >> > The Timer runs the function in another thread. Perhaps sys.exit is just > exiting that thread and not the main thread.
sys.exit raises a SystemExit exception, which will get handled in the new thread (where it won't do anything). Conceded, this isn't particularly intuitive. For a non-toy example, you'd probably create an Event object, use your timer to set the event, and your while loop would do while event.is_set(), so the problem wouldn't arise. Paul. -- http://mail.python.org/mailman/listinfo/python-list
