ui: do not use rawinput() when we have to replace sys.stdin/stdout See the inline comment for why. The current Python3 hack doesn't work if more than one user inputs are expected because TextIOWrapper fills its internal buffer at the first read() request. Maybe we could write an unbuffered TextIOWrapper, but I don't want to make things more complicated. Instead, this patch reinvents raw_input(' ') of no readline support.