XO Battle — Jeu de Tic-Tac-Toe

def print_board(board):
    print()
    print(f" {board[0]} | {board[1]} | {board[2]} ")
    print("---+---+---")
    print(f" {board[3]} | {board[4]} | {board[5]} ")
    print("---+---+---")
    print(f" {board[6]} | {board[7]} | {board[8]} ")
    print()

def check_win(board):
    """Checks if there's a winner on the board."""
    win_conditions = [
        [0, 1, 2],  # Top row
        [3, 4, 5],  # Middle row
        [6, 7, 8],  # Bottom row
        [0, 3, 6],  # Left column
        [1, 4, 7],  # Middle column
        [2, 5, 8],  # Right column
        [0, 4, 8],  # Diagonal from top-left
        [2, 4, 6]   # Diagonal from top-right
    ]
    
    for condition in win_conditions:
        a, b, c = condition
        if board[a] == board[b] == board[c] and board[a] != " ":
            return board[a]  # Return the winning marker ('X' or 'O')
    return None

def get_move(board, marker, player_names):
    """Prompts the player for a move and validates the input."""
    while True:
        try:
            move = int(input(f"{player_names[marker]} ({marker}), enter your move (1-9): "))
            if move < 1 or move > 9:
                print("Please choose a number between 1 and 9.")
                continue
            index = move - 1
            if board[index] != " ":
                print("That position is already taken. Choose another.")
                continue
            return index
        except ValueError:
            print("Invalid input. Please enter a number between 1 and 9.")

def tic_tac_toe(player_names):
    """Runs a single game of Tic Tac Toe."""
    board = [" "] * 9  # Initialize an empty board
    current_marker = "X"  # Player 1 gets "X" and Player 2 gets "O"
    move_count = 0

    # Game loop
    while move_count < 9:
        print_board(board)
        index = get_move(board, current_marker, player_names)
        board[index] = current_marker
        move_count += 1

        winner = check_win(board)
        if winner:
            print_board(board)
            print(f"Congratulations, {player_names[winner]} ({winner}) wins!")
            break

        # Switch markers between players
        current_marker = "O" if current_marker == "X" else "X"
    else:
        # No winner after 9 moves means a tie.
        print_board(board)
        print("It's a tie!")

def main():
    # Ask for the players' real names.
    print("Enter the names for the players:")
    player1 = input("Enter name for Player 1: ").strip()
    player2 = input("Enter name for Player 2: ").strip()
        
    # Assign markers: Player 1 gets "X" and Player 2 gets "O"
    player_names = {"X": player1, "O": player2}
    
    # Main game loop to allow restarting
    while True:
        tic_tac_toe(player_names)
        replay = input("Do you want to play again? (y/n): ").strip().lower()
        if replay != 'y':
            print("Thanks for playing!")
            break