def start(self):
        self._running = True
        self._next_timeout = self.io_loop.time()
        self._schedule_next()
Page types should be able to disable their creation
dataset/ETHPy150Open RobotWebTools/rosbridge_suite/rosbridge_server/src/tornado/ioloop.py/PeriodicCallback.start--crossover with--dataset/ETHPy150Open torchbox/wagtail/wagtail/wagtailcore/tests/test_page_model.py/TestIsCreatable.test_is_creatable_false