[docs] [issue36597] Travis CI: doctest failure

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> As far as reading your first report, this is happen only in your local
environment.

See the beginning of my first message, the doctest prevents me to merge a PR. But I tested on the master branch without my change, and I get the same issue locally, and the issues seems to be unrelated to my change.

"""
On my https://github.com/python/cpython/pull/12770 the doctest job of Travis CI failed with:

https://travis-ci.org/python/cpython/jobs/518572326
"""

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36597>
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