def promote(self):
        if self.expiry is not None:
            self.promoted = time() + self.expiry
A read-only property that returns the amount of seconds remaining before
dataset/ETHPy150Open benoitc/gaffer/gaffer/sockjs/sessioncontainer.py/SessionMixin.promote--crossover with--dataset/ETHPy150Open debrouwere/django-locking/locking/models.py/LockableModel.lock_seconds_remaining