a_main.py

game_board = [
    ["   ", " a ", " b ", " c "],
    [" 1 ", " - ", " - ", " - "],
    [" 2 ", " - ", " - ", " - "],
    [" 3 ", " - ", " - ", " - "]
]


def print_board():
    for row in game_board:
        to_print = ""
        for letter in row:
            to_print += str(letter)
        print(to_print)


def player_turn(who):
    koo = input(f'Zadej koordinát (ve formátu: c1, b3, apod.), hraje hráč "---{who}---": ')
    # koo = "a2"
    x_list = ["a", "b", "c"]
    y_list = ["1", "2", "3"]
    try:
        x = x_list.index(koo[0])
        y = y_list.index(koo[1])
    except (KeyError, ValueError, IndexError):
        print("Chybné zadání. Opakuj zadání.")
    else:
        to_fill = game_board[y + 1][x + 1]
        if to_fill == " X " or to_fill == " O ":
            print("Pole obsazeno. Opakuj zadání.")
        else:
            game_board[y + 1][x + 1] = f" {who} "


def change_player(actual_player):
    if actual_player == "X":
        return "O"
    else:
        return "X"


def check_winner(board):
    # rows
    for row in board:
        if (row[1] == row[2] == row[3] == " X ") or (row[1] == row[2] == row[3] == " O "):
            return f"Vítěz je Hráč {row[1]}! Blahopřeji!"
    # columns
    for col in range(1, 4):
        if (board[1][col] == board[2][col] == board[3][col] == " X ") or (
                board[1][col] == board[2][col] == board[3][col] == " O "):
            return f"Vítěz je Hráč {board[1][col]}! Blahopřeji!"
    # diagonals
    if (board[1][1] == board[2][2] == board[3][3] == " X ") or (board[1][1] == board[2][2] == board[3][3] == " O "):
        return f"Vítěz je Hráč {board[1][1]}! Blahopřeji!"
    elif (board[3][1] == board[2][2] == board[1][3] == " X ") or (board[3][1] == board[2][2] == board[1][3] == " O "):
        return f"Vítěz je Hráč {board[3][1]}! Blahopřeji!"

    # empty field
    empty = False
    for row in board:
        for letter in row:
            if letter == " - ":
                empty = True
    if not empty:
        return "Hrací pole je plné. Je to remíza."


game_on = True
player = "X"
while game_on:
    print_board()
    if check_winner(game_board):
        print(check_winner(game_board))
        game_on = False
        break
    player_turn(player)
    player = change_player(player)