tic-tac-toe.py

board = [i for i in range(9)]
is_win = False # keeps track of whether there is a winner or not

def print_board():
    count = 0
    for i in board:
        if count == 3 or count == 6:
            print()
        print(i, end=" ")
        count += 1
    print()

# print_board(board)

players = {}

def init_game():
    player_1 = input("Player 1 name : ")
    player_2 = input("Player 2 name : ")

    players["O"] = player_1 if len(player_1) > 0 else "Player 1"
    players["X"] = player_2 if len(player_2) > 0 else "Player 2"

    return

def play(player, position): 
    if type(board[position]) == str:
        next_pos = int(input(f"{players[player]} ({player}) : "))
        play(player, next_pos)
    else:
        board[position] = player

    return

def all_lose():
    all_str = True
    for i in board:
        if not type(i) == str:
            all_str = False
            break

    return all_str

def check_win_condition(player):
    win_conditions = [
        [0,1,2],
        [3,4,5],
        [6,7,8],
        [0,3,6],
        [1,4,7],
        [2,5,8],
        [0,4,8],
        [2,4,6],
    ]

    result = True

    for condition in win_conditions:
        result = True
        for idx in condition:
            if not (board[idx] == player):
                result = False
        if result: break

    return result

init_game()
print_board()

player_turn = "O"
# the game loop
while not is_win:
    position = int(input(f"{players[player_turn]} ({player_turn}) : "))

    play(player_turn, position)

    is_win = check_win_condition(player_turn)

    print_board()
    
    if all_lose():
        print("No Winner ;(")
        break

    if is_win:
        print(f"{players[player_turn]} won")

    if player_turn == "O":
        player_turn = "X"
    else:
        player_turn = "O"