3.13.4 was recently released. We don't have lang/python313 in the tree yet, so there's no time like the present to add it in order to stay up to date with state of the art in the Python space.
The package build completes successfully. I'm working through the plist issues as we speak..
The CFLAGS issue koobs@ addressed in lang/python312/files/patch-Makefile.pre.in (originally added with the 3.3) seems to still be needed as it was never fully upstreamed to python.org: https://svnweb.freebsd.org/ports?view=revision&revision=326729 . The patch doesn't apply cleanly, though... will continue plugging away on the one I'm posting in Phab now.
*** This bug has been marked as a duplicate of bug 274671 ***
I wasn't aware of work that vishwin@ had started to add the port already: https://reviews.freebsd.org/D49680 . I've abandoned mine in favor of their's.