Method do

Lib/_pyrepl/commands.py:312–319

(self)

class left(MotionCommand):
    def do(self) -> None:
        r = self.reader
        for _ in range(r.get_arg()):
            p = r.pos - 1
            if p >= 0:
                r.pos = p
            else:
                self.reader.error("start of buffer")


class right(MotionCommand):