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 ctemplate, had a general exception to keep using it in Fedora 31. Now, the dependency should be removed. It seems that Python 3 support was already merged upstream: https://github.com/OlafvdSpek/ctemplate/pull/139 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.
There is a discussion opstream to make a new release, I added that it would helpful for us to have a new release: https://github.com/OlafvdSpek/ctemplate/issues/137#issuecomment-592908834 If this doesn't happen, I'll carry the patch downstream.