I agree that `len(seq) == 0` is more readable. I don't mind the recommended truth test of the sequence itself, but I have no idea who would use their "wrong" op

I agree that `len(seq) == 0` is more readable. I don't mind the recommended truth test of the sequence itself, but I have no idea who would use their "wrong" option with the length as a truth value. Or maybe POSIX exit codes (0 is success) have made me shy about using integers as truth values.