Python 2 reached upstream end-of-life in January 2020. In Fedora Rawhide, it's now provided from the compat package `python27`. Packages that only use Python 2 at build time, like sdformat, had a general exception to keep using it in Fedora 31. Now, the dependency should be removed. Switching to Python 3 seemed easy to me (though I don't necessarily know much about sdformat). So I opened a pull request: https://src.fedoraproject.org/rpms/sdformat/pull-request/3 Could you merge it? If not, if it's possible that the Python 2 build dependency won't get removed in Fedora 33, please let us know; the package will need a FESCo exception. If you need anything from us, or something is unclear, please mention it here.
The test suite does run with Python 3 instead of Python 2. I've applied the change you submitted in the PR to rawhide with another fix. Thank you for the patch/PR. https://koji.fedoraproject.org/koji/taskinfo?taskID=43662885