def detach_volume(self, blockdevice_id):
        """
        Clear the cached device path, if it was cached.
        """
        try:
            del self._device_paths[blockdevice_id]
        except __HOLE__:
            pass
        return self._api.detach_volume(blockdevice_id)
dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/blockdevice.py/ProcessLifetimeCache.detach_volume