':param unicode blockdevice_id: The identity of the block device we
are attempting to attach.
:param unicode instance_id: The identity of the instance we are
attempting to attach the block device to.
:param unicode local_instance_id: The identity of the instance this
API is running on.'

def __init__(self, blockdevice_id, instance_id, local_instance_id):

    Exception.__init__(self, blockdevice_id, instance_id, local_instance_id)
    self.blockdevice_id = blockdevice_id
    self.instance_id = instance_id
    self.local_instance_id = local_instance_id
