Code to print keyboard keycodes for debugging keystroke delays

show_keycodes.py

#! /usr/bin/env python2

import sys
import termios
import tty

stdin_fd = sys.stdin.fileno()
old = termios.tcgetattr(stdin_fd)
try:
    tty.setcbreak(sys.stdin)
    while True:
        print ord(sys.stdin.read(1))
finally:
    old[3] = old[3] | termios.ECHO
    termios.tcsetattr(stdin_fd, termios.TCSADRAIN, old)