1.As mentioned in [1], we should avoid using six.iteritems to
achieve iterators. We can use dict.items 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
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