We should add <Esc+.> AKA Meta-. AKA Alt-. to bpython-curtsies. I'm not totally sure what it does, so the first step is opening a terminal and figuring it out and or googling it. Next step would be adding another elif to the process_event in the Repl class of bpython/curtsiesfrontend/repl.py that changes the current line accordingly.