Open Stack

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.

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.

-- Tom Barron


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

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