Tic-Tac-Toe - V1.0

import os

def init_board():
    """Returns an empty 3-by-3 board (with zeros)."""
    board = [["-","A","B","C"],[1,0,0,0],[2,0,0,0],[3,0,0,0]]
    return board


def get_move(board, player):
    """Returns the coordinates of a valid move for player on board."""
    row, col = 0, 0
    return row, col


def get_ai_move(board, player):
    """Returns the coordinates of a valid move for player on board."""
    row, col = 0, 0
    return row, col


def mark(board, player, row, col):
    """Marks the element at row & col on the board for player."""
    pass


def has_won(board, player):
    """Returns True if player has won the game."""
    return False


def is_full(board):
    """Returns True if board is full."""
    return False


def print_board(board):
    """Prints a 3-by-3 board on the screen with borders."""
    print("\n")
    for i in board:
        for j in i:
            print(j, end = " ")
        print()



def print_result(winner):
    """Congratulates winner or proclaims tie (if winner equals zero)."""
    pass


def tictactoe_game(mode='HUMAN-HUMAN'):
    board = init_board()
    # use get_move(), mark(), has_won(), is_full(), and print_board() to create game logic
    print_board(board)
    row, col = get_move(board, 1)
    mark(board, 1, row, col)

    winner = 0
    print_result(winner)


def main_menu():
    os.system("clear")
    print(f"""
Welcome to our Tic-Tac-Toe game!
Please select a game mode:
1. Human vs Human
2. Human vs AI
3. AI vs AI1
4. Quit Game
""")
    x = input("")
    if x == "1":
        tictactoe_game('HUMAN-HUMAN')


if __name__ == '__main__':
    main_menu()