Tic Tac Toe

A terminal, text based versino of Tic Tac Toe.

It's been a while since I did the opening modules of the course where we made terminal games, so this was more challenging than expected.

I made a list of lists for the board, and mapped each to a digit between 1 and 9 with a dictionary of tuples. Initially I had been inputting the rows and columns seperately, but this was not user friendly. The pieces are also mapped with a dictionary.

I wrapped everything in a class called Game(). It was good to work with a class, as I'm not as comfortable creating classes as I am functions.

I wondered how to check the win condition. Then I realised I could just define all of the win conditions, as there are only 8 of them, and then check each one at the end of every turn.

import os

class Game:
    def __init__(self) -> None:
        self.board: list[list[int]] = [
    [0,0,0],[0,0,0],[0,0,0]
    ]
        self.mappings: dict = {
            1:[0,0],2:[0,1],3:[0,2],
            4:[1,0],5:[1,1],6:[1,2],
            7:[2,0],8:[2,1],9:[2,2],
        }

        self.pieces = {0: ' ', 1:'x', 2:'o'}
        self.turn_count: int = 0
        self.is_won = False
        self.winning_piece = None

    def play(self, message = 'Game on!') -> None:
        os.system('clear')
        print(message)
        self.build_board()
        self.play_piece()
        self.check_win()
        self.check_draw()

    def play_piece(self) -> None:
        if not self.turn_count % 2:
            piece = 1
        else:
            piece = 2
        print(f"It's {self.pieces[piece]}'s turn.")

        self.place = input('Where are you placing your piece?: ')
        try:
            placement = int(self.place)
            position = self.mappings[placement]
        except ValueError:
            self.play("Please enter a valid key.")
        except KeyError:
            self.play('Key out of range')

        if placement not in range(1,10):
            self.play('Please choose valid position.')

        if self.board[position[0]][position[1]] != 0:
            self.play('This piece has already been played.')

        self.board[position[0]][position[1]] = piece
        self.turn_count += 1

    def build_board(self) -> None:
        rows = [i for i in self.board]
        map = 1
        for row in rows:
            row_pieces = [self.pieces[i] for i in row]
            print('|'.join(row_pieces) + '    ' + f'{map}|{map+1}|{map+2}')
            map += 3

    def check_draw(self) -> None:
        if self.turn_count >= 9:
            os.system('clear')
            print("It's a draw!")
            self.build_board()
            print("Too bad!")
            self.is_won = True
            input()
            os.system('clear')


    def check_win(self) -> None:
        self.win_conditions = [
            self.board[0],
            self.board[1],
            self.board[2],
            [self.board[0][0], self.board[1][0],self.board[2][0]],
            [self.board[0][1], self.board[1][1],self.board[2][1]],
            [self.board[0][2], self.board[1][2],self.board[2][2]],
            [self.board[0][0], self.board[1][1],self.board[2][2]],
            [self.board[0][2], self.board[1][1],self.board[2][0]],
        ]
        for position in self.win_conditions:
            if position[0] == position[1] and position[1] == position[2]:
                if position[0] != 0:
                    self.is_won = True
                    self.winning_piece = position[0]
                    self.declare_winner()

    def declare_winner(self) -> None:
        print(f"{self.pieces[self.winning_piece]} wins!")
        input()
        os.system('clear')

def main():
    game = Game()
    while not game.is_won:
        game.play()

if __name__ == "__main__":
    main()