An error in a simple program: TypeError: into object has no attribute 'getitem'

Question

I've been trying to program a simple Tic-Tac-Toe game for about 1 week now >.<'

Full source: http://pastebin.com/6dgjen9u

When testing my program in main():

I'm getting the error:

File "x:\programming\python\tac.py", line 64, in display_board
    print "\n\t", board[0], "  |", board[1], " |", board[2]
TypeError: 'int' object has no attribute '__getitem__'

The responsible functions here:

def display_board(board):
    """ Display game board on screen."""
    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"

def cpu_move(board, computer, human):
    """ Takes computer's move + places on board."""

    # make a copy of the board
    board = board[:]
    bestmoves = (0,2,6,8,4,3,5,1,7)

    # if computer can win, play that square:
    for move in legal_moves(board):
        board[move] = computer
        if winning_board(board) == computer:
            print "[debug] cpu win:", move
            return move
        # undo the move because it was empty before
        board[move] = EMPTY

    # if player can win, block that square:
    for move in legal_moves(board):
        board[move] = human
        if winning_board(board) == human:
            print "[debug] block human:", move
            return move
        board[move] = EMPTY

        # chose first best move that is legal
    for move in bestmoves:
        if move in legal_moves(board):
            board[move] = computer
            print "[debug] next best move:", move
            return move


def change_turn(turn):
    if turn == X:
        return O
    else:
        return X

def main():
    human, computer = go_first()
    board = new_board()
    display_board(board)
    turn = X
    while winning_board(board) == None:
        if human == turn:
            board = human_move(board, human)
            turn = change_turn(turn)
            display_board(board)
        else:
            board = cpu_move(board, computer, human)
            turn = change_turn(turn)
            display_board(board)

I have no idea what is causing the error because display_board(board) works fine for the human's move. It just fails when the computer takes its move.

zhangxaochen · Accepted Answer · 2014-03-02 16:39:43Z

1

cpu_move returns an integer here:

return move

Change it to return a list.

answered Mar 2, 2014 at 16:39

zhangxaochen

34.2k15 gold badges82 silver badges115 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

BBedit Over a year ago

That's right. I got confused about return values. I should've done return board

zhangxaochen Over a year ago

@user2071506 yes, the traceback you didn't post may already told you which line introduces that error

James · Accepted Answer · 2014-03-02 16:40:25Z

1

I don't see the human_move function, but anyways, your problem is that you're trying to index an integer.

When you return board, from cpu_move you are returning an int. Look at what you're returning: you're returning move, which is an integer, and doesn't have a __getitem__ method (which is the method that indexing calls).

answered Mar 2, 2014 at 16:40

James

2,8056 gold badges26 silver badges30 bronze badges

Comments

Ruben Bermudez · Accepted Answer · 2014-03-02 16:41:32Z

1

It is possible that your cpu_move function return an int here:

for move in bestmoves:
    if move in legal_moves(board):
        board[move] = computer
        print "[debug] next best move:", move
        return move

This may be the problem as you are using this value for the display_board function:

board = cpu_move(board, computer, human)
turn = change_turn(turn)
display_board(board)

answered Mar 2, 2014 at 16:41

Ruben Bermudez

2,32315 silver badges22 bronze badges

Collectives™ on Stack Overflow

An error in a simple program: TypeError: into object has no attribute 'getitem'

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related