index.py

def print_board(board):
    for row in board:
        print(" | ".join(row))
        print("-" * 5)

def check_winner(board):
    # Check rows
    for row in board:
        if row[0] == row[1] == row[2] != ' ':
            return row[0]

    # Check columns
    for col in range(3):
        if board[0][col] == board[1][col] == board[2][col] != ' ':
            return board[0][col]

    # Check diagonals
    if board[0][0] == board[1][1] == board[2][2] != ' ':
        return board[0][0]
    if board[0][2] == board[1][1] == board[2][0] != ' ':
        return board[0][2]

    return None

def tic_tac_toe():
    board = [[' ' for _ in range(3)] for _ in range(3)]
    players = ['X', 'O']
    current_player = 0

    print("Let's play Tic-Tac-Toe!")

    while True:
        print_board(board)
        print(f"Player {players[current_player]}'s turn")

        row = int(input("Enter row (0, 1, or 2): "))
        col = int(input("Enter column (0, 1, or 2): "))

        if board[row][col] == ' ':
            board[row][col] = players[current_player]
            winner = check_winner(board)
            if winner:
                print_board(board)
                print(f"Player {winner} wins!")
                break
            elif all(' ' not in row for row in board):
                print_board(board)
                print("It's a tie!")
                break
            current_player = (current_player + 1) % 2
        else:
            print("That cell is already taken. Try again.")

if __name__ == "__main__":
    tic_tac_toe()