Possibly somewhat related (sorry if not): after building Sage for Python 3, running `sage -t` lets the doctesting framework decide what to set `optional` to, and apparently it uses "python2" rather than "python3"; is this the desired behaviour?
$ ./sage --python --version Python 3.7.3 $ ./sage -t --all -p 2 Running doctests with ID 2019-08-29-17-56-03-a7156513. Git branch: develop Using --optional=build,dochtml,python2,sage -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/bdff653a-95ca-49a3-8f9d-521d1091a633%40googlegroups.com.
