I can confirm the python3-nova and associated dependencies from cloud-archive:stein-proposed have stopped the errors like these ones form the original report:
2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack [Previous line repeated 280 more times]
2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack RecursionError: maximum recursion depth exceeded while calling a Python object
I tested on bionic using the PPA and whereas nova was not accepting any requests before, now it works as expected.
I can confirm the python3-nova and associated dependencies from cloud-archive: stein-proposed have stopped the errors like these ones form the original report:
2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack [Previous line repeated 280 more times]
2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack RecursionError: maximum recursion depth exceeded while calling a Python object
I tested on bionic using the PPA and whereas nova was not accepting any requests before, now it works as expected.