new_contents: from os import system
  from time import sleep
  from msvcrt import getch
  from threading import Thread
  
  system('mode 50,30')
  game_running = True
  direction = 1
  delay = 0.07
  
  def clear():
  	system('cls')
  
  def controller():
  	global game_running,direction,delay
  	while game_running:
  		key = ord(getch())
  		if key == 27:
  			game_running = False
  		elif key == 224:
  			key = ord(getch())
  			if key == 72:
  				direction = 0
  			elif key == 80:
  				direction = 1
  			elif key == 77:
  				direction = 2
  			elif key == 75:
  				direction = 3
  		elif key == 102:
  			delay -= 0.01
  		elif key == 115:
  			delay += 0.01
  
  		
  
  def main():
  	global direction
  	snake = 'S'
  	snake_pos = [0,0]
  	screen = [' '*49 for i in range(30)]
  	size = (30,49)
  	inputs = Thread(target=controller)
  	inputs.start()
  	def blit_snake(x2,y2):
  		x1,y1 = snake_pos
  		screen[x1] = screen[x1][:y1] + ' ' + screen[x1][y1+1:]
  		screen[x2] = screen[x2][:y2] + snake + screen[x2][y2+1:]
  		snake_pos[0],snake_pos[1] = x2,y2
  	
  	blit_snake(0,0)
  	while game_running:
  		if direction == 0:
  			blit_snake(snake_pos[0]-1,snake_pos[1])
  		elif direction == 1:
  			blit_snake(snake_pos[0]+1,snake_pos[1])
  		elif direction == 2:
  			blit_snake(snake_pos[0],snake_pos[1]+1)
  		else:
  			blit_snake(snake_pos[0],snake_pos[1]-1)
  		clear()
  		if snake_pos[0] == size[0]-1:
  			direction = 0
  		elif snake_pos[0] == 0:
  			direction = 1
  		elif snake_pos[1] == size[1]-1:
  			direction = 3
  		elif snake_pos[1] == 0:
  			direction = 2
  		for i in screen:
  			print i,
  		sleep(delay)
  
  main()
subject: Test file added to estimate performance of program between systems.