[openstack-dev] [tripleo][python3] python3 readiness?

[Tom Barron]

Since python 2.7 will not be maintained past 2020 [1] it is a reasonable conjecture that downstream distributions will drop support for python 2 between now and then, perhaps as early as next year. In Pike, OpenStack projects, including TripleO, added python 3 unit tests. That effort was a good start, but likely we can agree that it is *only* a start to gaining confidence that real life TripleO deployments will "just work" running python 3. As agreed in the TripleO community meeting, this email is intended to kick off a discussion in advance of PTG on what else needs to be done.

-- Tom Barron


[1] https://pythonclock.org/
[2] https://lists.rdoproject.org/pipermail/dev/2018-February/008542.html

In this regard it is worth observing that TripleO currently only supports CentOS deployments and CentOS won't have python 3 support until RHEL does, which may be too late to test deploying with python3 before support for python2 is dropped. Fedora does have support for python 3 and for this reason RDO has decided [2] to begin work to run with *stabilized* Fedora repositories in the Rocky cycle, aiming to be ready on time to migrate to Python 3 and support its use in downstream and upstream CI pipelines.

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