'Delete just these attributes, not the whole object.
:param attrs: Attributes to save, as a list of string names
:type attrs: list
:return: self
:rtype: :class:`boto.sdb.db.model.Model`'

def delete_attributes(self, attrs):

    assert isinstance(attrs, list), 'Argument    must    be    a    list    of    names    of    keys    to    delete.'
    self._manager.domain.delete_attributes(self.id, attrs)
    self.reload()
    return self
