Hello, At the end of this cycle, Neutron should support Python 3.4 (https://blueprints.launchpad.net/neutron/+spec/neutron-python3). In order to do this, some hacking checks will be added, so that non python3-compliant code cannot be added. This might break code in neutron-*aas and other projects that use the Neutron hacking rules. Ihar Hrachyshka and I decided to submit patches to fix this: https://review.openstack.org/187353 https://review.openstack.org/187356 https://review.openstack.org/187364 If your project still uses dict.iteritems AND uses the Neutron hacking rules, you can: - replace dict.iteritems() with six.iteritems(); - ask me to do it for you! Cyril.