Tic-Tac-Toe game in Python

def print_board(board): print "The board look like this: \n" for i in range(3): print " ", for j in range(3): if board[i*3+j] == 1: print 'X', elif board[i*3+j] == 0: print 'O', elif board[i*3+j] != -1: print board[i*3+j]-1, else: print ' ', if j != 2: print " | ", print if i != 2: print "-----------------" else: print def print_instruction(): print "Please use the following cell numbers to make your move" print_board([2,3,4,5,6,7,8,9,10]) def get_input(turn): valid = False while not valid: try: user = raw_input("Where would you like to place " + turn + " (1-9)? ") user = int(user) if user >= 1 and user <= 9: return user-1 else: print "That is not a valid move! Please try again.\n" print_instruction() except Exception as e: print user + " is not a valid move! Please try again.\n" def check_win(board): win_cond = ((1,2,3),(4,5,6),(7,8,9),(1,4,7),(2,5,8),(3,6,9),(1,5,9),(3,5,7)) for each in win_cond: try: if board[each[0]-1] == board[each[1]-1] and board[each[1]-1] == board[each[2]-1]: return board[each[0]-1] except: pass return -1 def quit_game(board,msg): print_board(board) print msg quit() def main(): # setup game # alternate turns # check if win or end # quit and show the board print_instruction() board = [] for i in range(9): board.append(-1) win = False move = 0 while not win: # print board print_board(board) print "Turn number " + str(move+1) if move % 2 == 0: turn = 'X' else: turn = 'O' # get user input user = get_input(turn) while board[user] != -1: print "Invalid move! Cell already taken. Please try again.\n" user = get_input(turn) board[user] = 1 if turn == 'X' else 0 # advance move and check for end game move += 1 if move > 4: winner = check_win(board) if winner != -1: out = "The winner is " out += "X" if winner == 1 else "O" out += " :)" quit_game(board,out) elif move == 9: quit_game(board,"No winner :(") if __name__ == "__main__": main()