@manipulative
    def clear(self):
        self.session.client.delete(self.key)
Adds a callback to be run every period_milliseconds until it is removed.
dataset/ETHPy150Open dahlia/sider/sider/hash.py/Hash.clear--crossover with--dataset/ETHPy150Open bokeh/bokeh/bokeh/util/tornado.py/_CallbackGroup.add_periodic_callback