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Problem 2. tttCheckMove()
Write a function named tttCheckMove() that checks whether or not a TicTacMove is on an empty space
on a TTT board.
Input (two parameters):
· Parameter 1: A string of 9 characters denoting the state of a TTT board. Each character in the
string indicates the state of one TicTacToe square – an ‘X’ or ‘O’ if the square is occupied, a ‘-‘
if it is not. The squares are numbered left to right and from the bottom up:

|6|7|8|
|3|4|5|
|0|1|2| ---- simulates tic tac toe board

For example, this TicTacToe board
| | | |
|X| | | ---- X is in space '3'
| | | |
is represented by the string '---X-----'.
· Parameter 2: An int from 0 to 8 inclusive, representing a TicTacToe move.
Output:
Return True if the move is in an unoccupied space, otherwise return False.
Here is sample output:

from ticTacToe import *
board = '----X----'
move = 1
tttCheckMove(board, move)
False
row = 0
column = 1
tttCheckMove(board, row, column)
True

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Dani AI

Generated

— don't worry, this is a small, well-scoped task. As pointed out, post any attempt if you need debugging; below is a minimal, easy-to-follow plan and a compact Python implementation you can drop into your program.

Plan: 1) Validate the board is a 9-character string. 2) Accept either a single integer move (0..8) or two integers (row, column). 3) Convert row/column to the string index with row 0 as the bottom row: index = column + row*3. 4) Return True only when that character is '-' (empty); otherwise False.

def tttCheckMove(board, a, b=None):
    """
    Return True if the chosen square is empty ('-').
    Usage:
      tttCheckMove(board, move)           # move in 0..8
      tttCheckMove(board, row, column)    # row, column in 0..2; row 0 is bottom
    """
    if not isinstance(board, str) or len(board) != 9:
        return False
    if b is None:
        move = a
        if not isinstance(move, int) or not (0 <= move <= 8):
            return False
        idx = move
    else:
        row, col = a, b
        if not (isinstance(row, int) and isinstance(col, int)):
            return False
        if not (0 <= row <= 2 and 0 <= col <= 2):
            return False
        idx = col + row * 3
    return board[idx] == '-'

Notes/troubleshooting: many students mix up whether row 0 is the top or bottom — confirm which your tests expect. Also check for off-by-one errors when converting row/col to an index and make sure the board string really uses - for empty squares. If a test still fails, post the exact board string, the inputs you used, and the output you expected (and your code) so the community can point to the specific issue.

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Member Avatar for TrustyTony

You forgot your code and description of your problem.

Member Avatar for minimee120

I have no idea where to start

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