python-doit fails to build with Python 3.9.0a4:

+ make html SPHINXBUILD=sphinx-build-3
Running Sphinx v2.2.2
making output directory... done
Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/sphinx/cmd/build.py", line 272, in build_main
    app = Sphinx(args.sourcedir, args.confdir, args.outputdir,
  File "/usr/lib/python3.9/site-packages/sphinx/application.py", line 276, in __init__
    self._init_builder()
  File "/usr/lib/python3.9/site-packages/sphinx/application.py", line 336, in _init_builder
    self.builder.init()
  File "/usr/lib/python3.9/site-packages/sphinx/builders/html.py", line 249, in init
    self.init_templates()
  File "/usr/lib/python3.9/site-packages/sphinx/builders/html.py", line 289, in init_templates
    self.theme = theme_factory.create(themename)
  File "/usr/lib/python3.9/site-packages/sphinx/theming.py", line 262, in create
    raise ThemeError(__('no theme named %r found '
sphinx.errors.ThemeError: no theme named 'press' found (missing theme.conf?)
Theme error:
no theme named 'press' found (missing theme.conf?)

It seems this problem is not related to Pyhon 3.9, as the build in Koji with Python 3.8 failed as well.

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.9/fedora-rawhide-x86_64/01311939-python-doit/

For all our attempts to build python-doit with Python 3.9, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/package/python-doit/

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.9:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/

Let us know here if you have any questions.

Python 3.9 will be included in Fedora 33. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.9.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.