Square_Num = 9
X = "X"
O = "O"
blank = " "
human = X
comp = O
Tie = "Tie"
#create board
def new_board():
        board = []
        for square in range(Square_Num):
            board.append(blank)
        return board

def display_board(board):
        print "\n\t", board[0], "|", board[1], "|", board[2]
        print "\t", "---------"
        print "\t", board[3], "|", board[4], "|", board[5]
        print "\t", "---------"
        print "\t", board[6], "|", board[7], "|", board[8], "\n"
#declare moves
def legal_moves(board):
        moves = []
        for square in range(Square_Num):
                if board[square] == blank:
                        moves.append(square)
        return moves
#declare board number that can win
def moves():
        WIN_MOVES = ((0, 1, 2),
                     (3, 4, 5),
                     (6, 7, 8),
                     (0, 3, 6),
                     (1, 4, 7),
                     (2, 5, 8),
                     (0, 4, 8),
                     (2, 4, 6))


        for row in WIN_MOVES:
                if board[row[0]] == board[row[1]] == board[row[2]] != blank:
                        winner = board[row[0]]
                        return winner

                if blank not in board:
                        return Tie
                return None

def  human_move(board, human):
        legal = legal_move(board)
        move = None
        while move not in legal:
                move = ask_move("Enter move number "), 0, Square_Num
                if move not in legal:
                        print "\nPlease choose again\n"
        return move

def comp_move(board, comp, human):
    board = board[:]
    GOOD_MOVES = (4, 0, 8, 1, 6, 2, 3, 5, 7)

    for move in legal_moves(board):
        board[move] = human
        if winner(board) == human:
            print move
            return move
        board[move] = EMPTY

    # since no one can win on next move, pick best open square
    for move in GOOD_MOVES:
        if move in legal_moves(board):
            print move
            return move

def next_turn(turn):
    if turn == X:
        return 0
    else:
        return X

def congrat_winner(the_winner, comp, human):
    if the_winner != TIE:
        print the_winner, "won!\n"
    else:
        print "It's a tie!\n"
    if the_winner == computer:
        print "Player looses \n"  \

    elif the_winner == human:
        print "Player wins \n" \

    elif the_winner == TIE:
        print "The game is a tie.  \n"  \

def main():
    turn = X
    board = new_board()
    display_board(board)

    while not winner(board):
        if turn == human:
            move = human_move(board, human)
            board[move] = human
        else:
            move = comp_move(board, comp, human)
            board[move] = comp
        display_board(board)
        turn = next_turn(turn)
        the_winner = winner(board)
        congrat_winner(the_winner, computer, human)

main()

 while not winner(board):