Only run docs-building sessions with Python 3.8. #4210
Merged
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🚀 Pull Request
Make sessions that build docs (doctest, gallery, linkcheck) only support Python 3.8.
Hitherto we offered 'docstest-3.7' and 'docstest-3.8'. We could still do that, but I'm choosing not to.
(since Py3.7 gives different results in some cases)
Likewise, if nox is called specifying a specific unsuitable python, via the PY_VER environment variable, we could still run the session, with Python3.8, but instead I chose not to allow it all.
So..
nox -s doctest
now runs with Python 3.8PY_VER=3.8 nox -s doctest
still works* this is how cirrus invokes it
PY_VER=3.7 nox -s doctest
now gives an errorNew behaviours demonstrated :