there are plenty of Python packages in Fedora currently using setuptools at buildtime but not all of them are BuildRequiring it explicitly. This only works because python3-devel (transitively) depends on python3-setuptools.
We would like to kindly ask you to add explicit BuildRequires for python3-setuptoolsto packages where setuptools is used. It will help us with testing new versions of setuptools in the future or with decoupling Python and setuptools. Today, if we want to know if a package is using setuptools, we have to do `fedpkg prep` and use grep to search for setuptools. Using a repoquery is much more convenient.
Several packages can successfully build either with or
without setuptools (they use try-except import and fallback to
distutils from the standard library). Such packages are especially
dangerous when not BuildRequiring setuptools -- they can produce
different results depending on the presence of setuptools: either an
.egg-info metadata directory (w/setuptools) or .egg-info text file
(w/distutils). RPM has troubles when upgrading directories to files .