Thanks Victor! This is a great improvement.

On Fri, Sep 18, 2020 at 8:50 AM Victor Stinner <vstin...@python.org> wrote:

> Hi,
>
> The Python 3.8, 3.9 and 3.10 documentation can now be built with
> Sphinx 3.2+, and Sphinx 2 is still supported. Sphinx 3.0 and 3.1 are
> not supported.
>
> On our continuous integration (CI), the Python 3.10 documentation is
> now built with Sphinx 3 (version 3.2.1), whereas the Python 3.8 and
> Python 3.9 documentation is still built with Sphinx 2 (just updated to
> version 2.4.4). Also, the Sphinx version is now only pinned in a
> single file (Doc/requirements.txt), rather than 3 files
> (Doc/requirements.txt, .travis.yml and Doc/Makefile).
>
> Thanks to everyone who helped to fix all these documentation build issues!
>
> --
>
> Sphinx 3.0 released in April 2020 is backward incompatible with Sphinx
> 2: the C domain is stricter, and it is no longer possible to build the
> Python documentation with Sphinx 3.0.
>
> I discussed with the Sphinx maintainers. They accepted to add two new
> options to Sphinx 3.2 to add an opt-in Sphinx 2 compatibility mode:
>
> # bpo-40204: Allow Sphinx 2 syntax in the C domain
> c_allow_pre_v3 = True
>
> # bpo-40204: Disable warnings on Sphinx 2 syntax of the C domain since the
> # Python documentation is built with -W (warnings treated as errors).
> c_warn_on_allowed_pre_v3 = False
>
> I modified Doc/conf.py to use these options.
>
> I also fixed other real documentation issues, discovered by stricter
> Sphinx 3:
> https://bugs.python.org/issue40204
>
> --
>
> By the way, all warnings produced during the documentation build have
> been fixed as well:
> https://bugs.python.org/issue35293
>
> It took two years (I created the issue in November 2018) to fix all
> these warnings! Multiple projects got fixes:
>
> * Update our Doc/tools/extensions/pyspecific.py extension to fix
> Sphinx RemovedInSphinx40Warning, by Dong-hee Na
> * jinja2:
> https://github.com/pallets/jinja/commit/31bf9b7e71c3fee3b7866ffdc0f70f4525a490d9
> (import collections ABC)
> * python-babel: https://github.com/python-babel/babel/pull/609 (import
> collections ABC)
> * docutils: https://sourceforge.net/p/docutils/bugs/373/ (version 0.16
> fixed SyntaxWarning on invalid escape sequence)
> * etc.
>
> --
>
> The last remaining minor issue is my proposition to also update Sphinx
> in docsbuild-scripts (docs.python.org):
> https://github.com/python/docsbuild-scripts/issues/95
>
> Victor
> --
> Night gathers, and now my watch begins. It shall not end until my death.
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-- 
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*Pronouns: he/him **(why is my pronoun here?)*
<http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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