def pop(self, blocking = False, timeout = -1):
        if len(self) == 0 and blocking:
            self.channel.receive(timeout)
        return collections.deque.pop(self)
Return a list of str for values that changed from old_snapshot.
dataset/ETHPy150Open concurrence/concurrence/lib/concurrence/core.py/Deque.pop--crossover with--dataset/ETHPy150Open buildingenergy/buildingenergy-platform/seed/models.py/_get_diff_sources