tornado.options.parse_command_line()

@tornado.gen.coroutine
def callback():
    logging.info('get ready for an error...')
try:
    raise Exception()
except Exception as e:
    logging.exception(e)
main_loop = tornado.ioloop.IOLoop.instance()
scheduler = tornado.ioloop.PeriodicCallback(callback, 1000, io_loop=main_loop)
scheduler.start()
main_loop.start()
In Tornado, how can I see Exceptions rasied in a coroutine called by PeriodicCallback?