A tic-tac-toe game, (almost) implemented by GitHub Copilot

tic_tac_toe.py

# Prompt:

"""A tic-tac-toe game."""

# Everything down below is autocompleted:

def print_board(board):
    """Prints the board."""
    print(board[0] + ' | ' + board[1] + ' | ' + board[2])
    print('---------')
    print(board[3] + ' | ' + board[4] + ' | ' + board[5])
    print('---------')
    print(board[6] + ' | ' + board[7] + ' | ' + board[8])


def player_input():
    """Asks the player for their input."""
    marker = ''
    while not (marker == 'X' or marker == 'O'):
        marker = input('Player 1: Do you want to be X or O? ').upper()
    if marker == 'X':
        return ('X', 'O')
    else:
        return ('O', 'X')


def place_marker(board, marker, position):
    """Places the marker on the board."""
    board[position] = marker


def win_check(board, mark):
    """Checks if the player has won."""
    return ((board[0] == mark and board[1] == mark and board[2] == mark) or
            (board[3] == mark and board[4] == mark and board[5] == mark) or
            (board[6] == mark and board[7] == mark and board[8] == mark) or
            (board[0] == mark and board[3] == mark and board[6] == mark) or
            (board[1] == mark and board[4] == mark and board[7] == mark) or
            (board[2] == mark and board[5] == mark and board[8] == mark) or
            (board[0] == mark and board[4] == mark and board[8] == mark) or
            (board[2] == mark and board[4] == mark and board[6] == mark))


def choose_first():
    """Chooses which player goes first."""
    if random.randint(0, 1) == 0:
        return 'Player 1'
    else:
        return 'Player 2'


def space_check(board, position):
    """Checks if the space is empty."""
    return board[position] == ' '


def full_board_check(board):
    """Checks if the board is full."""
    for i in range(len(board)):
        if space_check(board, i):
            return False
    return True


def player_choice(board):
    """Asks the player for their choice."""
    position = 0
    while position not in [1, 2, 3, 4, 5, 6, 7, 8, 9] or not space_check(board, position):
        position = int(input('Choose your next position: (1-9) '))
    return position


def replay():
    """Asks the player if they want to play again."""
    return input('Do you want to play again? Enter Yes or No: ').lower().startswith('y')


print('Welcome to Tic Tac Toe!')


while True:
    # Set the game up here
    the_board = [' '] * 10
    player1_marker, player2_marker = player_input()
    turn = choose_first()
    print(turn + ' will go first.')
    play_game = input('Are you ready to play? Enter Yes or No: ')
    if play_game.lower()[0] == 'y':
        game_on = True
    else:
        game_on = False

    while game_on:

        # Player 1's turn.
        if turn == 'Player 1':
            # Show the board.
            print_board(the_board)
            # Choose a position.
            position = player_choice(the_board)
            # Place the marker on the board.
            place_marker(the_board, player1_marker, position)
            # Check if they won.
            if win_check(the_board, player1_marker):

                print_board(the_board)
                print('Congratulations! You have won the game!')
                game_on = False
            else:
                # If they didn't win, it's now Player 2's turn.
                turn = 'Player 2'

        else:
            # Player 2's turn.
            # Show the board.
            print_board(the_board)
            # Choose a position.
            position = player_choice(the_board)
            # Place the marker on the board.
            place_marker(the_board, player2_marker, position)
            # Check if they won.
            if win_check(the_board, player2_marker):

                print_board(the_board)
                print('Congratulations! You have won the game!')
                game_on = False
            else:
                # If they didn't win, it's now Player 1's turn.
                turn = 'Player 1'


    # If the game is over, ask if they want to play again.
    if not replay():
        break

    # Clear the board.
    the_board = [' '] * 10
    # Reset the markers.
    player1_marker, player2_marker = player_input()
    # Reset the turn.
    turn = choose_first()
    # Reset the game_on variable.
    game_on = True
    # Reset the board.
    the_board = [' '] * 10
    # Reset the markers.
    player1_marker, player2_marker = player_input()
    # Reset the turn.
    turn = choose_first()
    # Reset the game_on variable.
    game_on = True
    # Reset the board.
    the_board = [' '] * 10