I know there has been some discussion on this. #232, for example. I don't know if this merits trying to figure out a solution, but it would be nice to be able to play with Questionary in BPython. :) ...
After upgrading to the most recent commit from master I've got the following, just right on the first line, when tried to issue s='a[a.l-1]': (Tests)alex@rhyme ~/work/DispatchersTests $ bpython ...