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1、As mentioned in [1], we should avoid using six.iteritems/keys achieve iterators. We can use dict.items/keys instead, as it will return iterators in PY3 as well. And dict.items/keys will more readable. 2、In py2, the performance about list should be negligible, see the link [2]. [1] https://wiki.openstack.org/wiki/Python3 [2] http://lists.openstack.org/pipermail/openstack-dev/ 2015-June/066391.html TrivialFix. Change-Id: I0cbe8af3210233a58d25f0df187c3d085405aa2a