def cursorBackward(self, n=1):
        assert n >= 1
        self.cursorPos.x = max(self.cursorPos.x - n, 0)
        self.write('\x1b[%dD' % (n,))
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/conch/insults/insults.py/ServerProtocol.cursorBackward/original