Save just these few attributes, not the whole object

        :param attrs: Attributes to save, key->value dict
        :type attrs: dict
        :return: self
        :rtype: :class:`boto.sdb.db.model.Model`

def put_attributes(self, attrs):
        """
        Save just these few attributes, not the whole object

        :param attrs: Attributes to save, key->value dict
        :type attrs: dict
        :return: self
        :rtype: :class:`boto.sdb.db.model.Model`
        """
        assert(isinstance(attrs, dict)), "Argument must be a dict of key->values to save"
        for prop_name in attrs:
            value = attrs[prop_name]
            prop = self.find_property(prop_name)
            assert(prop), "Property not found: %s" % prop_name
            self._manager.set_property(prop, self, prop_name, value)
        self.reload()
        return self