Raw mode in python

raw.py

import sys
import tty
import termios

def raw():
    # save old setting
    file_desc = sys.stdin.fileno()
    old_setting = termios.tcgetattr(file_desc)

    # enable raw mode
    tty.setraw(sys.stdin)

    # read one key
    k = str(sys.stdin.read(1))
    while k != 'q':
        # output
        if k == 'w':
            print("\r\033[0K up", end='')
        elif k == 's':
            print("\r\033[0K down", end='')
        elif k == 'a':
            print("\r\033[0K left", end='')
        elif k == 'd':
            print("\r\033[0K right", end='')

        sys.stdout.flush()

        # read one key
        k = str(sys.stdin.read(1))

    # reset raw mode
    termios.tcsetattr(file_desc, termios.TCSADRAIN, old_setting)