TicTacToe Class Description

The TicTacToe class represents a standard Tic Tac Toe game. The game consists of a 3x3 board where two players, typically represented as "X" and "O", take turns marking the spaces in a grid. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row wins the game.

To win in Tic Tac Toe, a player must have three of their symbols (either X or O) consecutively in a row. This can be achieved in the following ways:

Methods to Implement

Students are required to implement the following methods:

do_move: Make a move on the board
is_valid_move: Check if a move is valid
check_game_over: Check if the game is over

Once these methods are implemented correctly, the play_game function will allow you to play a complete game of Tic Tac Toe in the console.

Explanation of the Double For Loop List Comprehension

The list comprehension used to initialize the board is a concise way to create a 3x3 grid with all spaces empty. The outer loop iterates through the rows, and the inner loop iterates through the columns.

[[self.EMPTY for _ in range(3)] for _ in range(3)]

This double for-loop list comprehension creates a list of three lists, where each inner list contains three EMPTY spaces, effectively creating a 3x3 grid.

This can be equivalently expressed using two nested for loops:


        board = []


        for _ in range(3):
            row = []
            for _ in range(3):
                row.append(self.EMPTY)
            board.append(row)

Implementing `do_move` in Tic Tac Toe

The do_move function is responsible for handling the player's move. Here's a breakdown of how to implement it:

1. Check Validity of the Move:

First, implement is_valid_move. Use this method in do_move. In this method:

Ensure the chosen cell is within the boundaries of the board.
Ensure the chosen cell is unoccupied (i.e., it doesn't already contain X or O).

2. Update the Board:

Assign the current player's self.current_player symbol (X or O) to the chosen cell.
Return True if we successfully updated the game board and False otherwise.

Instructions to Play

Once the three methods are implemented, you can run the play_game() function to start the game. Players will be prompted to input their moves in the format of row and column separated by a space. The game will continue until a player wins or all cells are filled, resulting in a tie.

Have fun implementing and playing Tic Tac Toe! This game is a great example of a program you can create for your final project if you decide to use Python!