# code exemple find at : https://stackoverflow.com/questions/2408560/python-nonblocking-console-input

import sys
import select
import tty
import termios

def isData():
	return select.select([sys.stdin], [], [], 0) == ([sys.stdin], [], [])

old_settings = termios.tcgetattr(sys.stdin)

try:
	tty.setcbreak(sys.stdin.fileno())

	i = 0
	while 1:
		#if i % 100000 == 0:
		#	print("i", i)
		#i += 1
		if isData():
			c = sys.stdin.read(1)
			print(c)
			if c == '\x1b':		 # x1b is ESC
				break

finally:
	termios.tcsetattr(sys.stdin, termios.TCSADRAIN, old_settings)



### for windows
#import msvcrt
#
#num = 0
#done = False
#while not done:
#	print(num)
#	num += 1
#
#	if msvcrt.kbhit():
#		print "you pressed",msvcrt.getch(),"so now i will quit"
#		done = True
#

## cross platforme (but may be a bit huge to import pygame...)
#import pygame
#from pygame.locals import *
#
#def display(str):
#	text = font.render(str, True, (255, 255, 255), (159, 182, 205))
#	textRect = text.get_rect()
#	textRect.centerx = screen.get_rect().centerx
#	textRect.centery = screen.get_rect().centery
#
#	screen.blit(text, textRect)
#	pygame.display.update()
#
#pygame.init()
#screen = pygame.display.set_mode( (640,480) )
#pygame.display.set_caption('Python numbers')
#screen.fill((159, 182, 205))
#
#font = pygame.font.Font(None, 17)
#
#num = 0
#done = False
#while not done:
#	display( str(num) )
#	num += 1
#
#	pygame.event.pump()
#	keys = pygame.key.get_pressed()
#	if keys[K_ESCAPE]:
#		done = True
#