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Hi,

There are a few changes to the Python `tox` jobs that CI is running: 1. Most importantly, Python 3.5 is now the default version when invoked with `tox`. This can be overridden by using basepython[1]. 2. Multiple Python 3 versions are available: 3.4, 3.5, 3.6, and 3.7 (T191764). 3. It's now based on Debian Stretch, instead of Jessie, so some system libraries are newer.

It's possible that #1 will break some repos, but with the Python 2 EOL coming very soon, it was time to just do it.

You can take advantage of #2 by having multiple environments in tox.ini, see keyholder[2] for an example.

I'm still working on rolling these out, so it might take another day or two for it to take effect. If you run into any issues/problems, please file a bug in the Continuous-Integration-Config Phabricator project.

[1] https://tox.readthedocs.io/en/latest/example/general.html#basepython-def aults-overriding [2] https://gerrit.wikimedia.org/r/plugins/gitiles/operations/software/keyho lder/+/master/tox.ini#3

- -- Legoktm