'Save this object as it is, with an optional expected value
:param expected_value: Optional tuple of Attribute, and Value that
must be the same in order to save this object. If this
condition is not met, an SDBResponseError will be raised with a
Confict status code.
:type expected_value: tuple or list
:return: This object
:rtype: :class:`boto.sdb.db.model.Model`'

def put(self, expected_value=None):

    self._manager.save_object(self, expected_value)
    return self
