def main():
	import os, time
	menu_selection = 0
	while menu_selection != 5:
		clear_screen()
		mainmenu()
		if menu_selection == 1:
			clear_screen()
			print_instructions()
		elif menu_selection == 2:
			prep_game()
			while grid_check(grid_list) == 0:
				clear_screen()
				display_grid(list)
				selection = in_game_menu()
			if selection == 1:
				set_buffer()
				set_list(input("Cell: "), input("Value: ")
			elif choice == 2:
				undo()
			elif selection == 3:
				clear_screen()
				mainmenu()
				if menu_selection == 1:
					clear_screen()
					print_instructions()
				elif menu_selection == 2:
					prep_game()
				elif menu_selection == 3:
					return(3)
				elif menu_selection == 4:
					clear_screen()
					display_scores()
				elif menu_selection == 5:
					print("Thanks for playing!")
					time.pause(1)
					exit()
			elif selection == 4:
				exit()
		print("Congratulatons! you win!")
		time.pause(2)f
	elif menu_selection == 3:
		raw_input("You must have started a gave first.")
	elif menu_selection == 4:
		clear_screen()
		display_scores()
		exit()
	exit()

def set_list(location, value):
	grid_list[location] = value

def prep_game():
	grid_list = [0,0,0,0,0,0,0,0,0]
	set_list(RANDOM NUMBER1-3, RANDOM NUMBER 0-8)

def in_game_menu():
	print("1. Enter symbol/square")
	print("2. Undo previous move")
	print("3. Pause game")
	print("Quit game")
	return(input("\nSelection: "))

def display_scores():
	return()

def set_buffer():
	grid_list_buffer = grid_list

def undo():
	grid_list = grid_ist_buffer

def display_grid(list):
	print(" _________ ")
	print("|   |   |   |")
	print("| %d | %d | %d |" % (list[0],list[1],list[2])
	print("|___|___|___|")
	print("|   |   |   |")
	print("| %d | %d | %d |" % (list[3],list[4],list[5])
	print("|___|___|___|")
	print("|   |   |   |")
	print("| %d | %d | %d |" % (list[6],list[7],list[8])
	print("print("|___|___|___|")")

def grid_check(list):
	x1 = (list[0] + list[1] + list[2])
	x2 = (list[3] + list[4] + list[5])
	x3 = (list[6] + list[7] + list[8])
	y1 = (list[0] + list[3] + list[6])
	y2 = (list[1] + list[4] + list[7])
	y3 = (list[2] + list[5] + list[8])
	if (x1 + x2 +x3 + y1 + y2 +y3) == 36:
		return(1)
	else:
		return 0

def clear_screen():
	for i in (75):
		print("\n")

def mainmenu():
	clear_screen():
	print("Welcome to Latin Squares!!!\n\n")
	print("Main Menu:\n")
	print("1.  Game overview/instructions")
	print("2.  Start new game")
	print("3.  Resume current game")
	print("4.  View (top 5) high scores")
	print("5.  Quit")
	menu_selection = input("\nSelection: ")

def print_instructions():
	print("Well, this is the game's instructions....")
	print("\nPress enter to contine....")
	raw_input("\n")

main()