+++ This bug was initially created as a clone of Bug #1738016 +++ The libxslt bindings have _not_ been converted to Python 3. In fact there are some fairly fundamental problems including Python 2 syntax everywhere (including the configure script). I have removed the Python 2 bindings in Fedora 31 & Rawhide, so these need to be obsoleted. There is no Python 3 replacement at this time.
As an aside, generic XSLT repertoire is subsumed together with other XML related functionality (all based on libxml2 and libxslt under the hood) for Python crowds in nice-to-work-with[*] lxml project, see python[23]-lxml. [*] TBH, haven't ever got beyond lxml for XML/XSLT handling, for how convenient it was from the first moment, documentation wise, etc.
Changing version to rawhide, since the f31 update was unpushed.