https://qiita.com/KMim/items/53e345218e25ba67cf39#comment-52eb4c51a476edd36c27

othello.py

class Board:

    def __init__(self, size, space=None):
        self.cells = [[space] * size for i in range(size)]
        self.space = space

    def __iter__(self):
        return (tuple(row) for row in self.cells)

    def __getitem__(self, pos):
        x, y = pos
        return self.cells[y][x]

    def __setitem__(self, pos, stone):
        x, y = pos
        self.cells[y][x] = stone

    def __contains__(self, pos):
        x, y = pos
        return 0 <= y < len(self.cells) and 0 <= x < len(self.cells[y])

    def is_space(self, x, y):
        return self[x, y] == self.space


class Action:

    def __init__(self, board, stone, points):
        self.board = board
        self.stone = stone
        self.points = points

    def put(self):
        for x, y in self.points:
            self.board[x, y] = self.stone


class Stone:
    SPACE = "."
    BLACK = "X"
    WHITE = "O"


class Othello:
    DIRS = (-1, -1), (0, -1), (1, -1), (-1, 0), (1, 0), (-1, 1), (0, 1), (1, 1)

    def __init__(self, stone=Stone):
        self.black = stone.BLACK
        self.white = stone.WHITE
        self.board = Board(size=8, space=stone.SPACE)
        self.board[3, 3], self.board[3, 4] = self.white, self.black
        self.board[4, 3], self.board[4, 4] = self.black, self.white

    def reversibles(self, x, y, stone):
        """石を置いたときに反転できる座標、座標が一つでもあれば石を置ける"""
        if not self.board.is_space(x, y):
            return ()  # 空地でなければ座標なし
        def one_direction(dx, dy):
            points = []  # 8方向のうちの1方向での反転可能座標
            cx, cy = x + dx, y + dy
            while (cx, cy) in self.board and not self.board.is_space(cx, cy):
                if self.board[cx, cy] == stone:
                    # 自分のコマに辿り着いた、反転できるコマの座標を返す
                    return points
                # 相手のコマ、自分のコマに辿り着いたときに反転できる
                points.append((cx, cy))
                cx, cy = cx + dx, cy + dy
            return []  # 盤の端に到達したか空地に到達したら反転できない
        return tuple(sum((one_direction(dx, dy) for dx, dy in self.DIRS), []))

    def is_playable(self):
        """石を置ける場所があるならTrue"""
        return any(self.reversibles(x, y, stone)
                   for y, row in enumerate(self.board)
                   for x, _ in enumerate(row)
                   for stone in (self.white, self.black))

    def actions(self, stone):
        """石を置ける座標と、置いたときの操作の辞書データ"""
        return {(x, y): Action(self.board, stone, ((x, y),) + reversibles)
                for y, row in enumerate(self.board)
                for x, _ in enumerate(row)
                for reversibles in [self.reversibles(x, y, stone)]
                if reversibles}

    def count(self, stone):
        return sum(cell == stone for row in self.board for cell in row)

    def judge(self):
        black_stones = self.count(self.black)
        white_stones = self.count(self.white)
        return (self.black if black_stones > white_stones else
                self.white if black_stones < white_stones else
                None)


class Player:

    def __init__(self, stone, name):
        self.stone = stone
        self.name = name

    def __str__(self):
        return f"{self.name}({self.stone})"

    def play(self, othello):
        actions = othello.actions(self.stone)
        if not actions:
            print(f"{self}はコマを置けません。パスします。")
            return
        print()
        print(f"{self}の番です。")
        print("置ける場所(x y):", " , ".join(f"{x} {y}" for x, y in actions))
        while True:
            try:
                choice = input(f"コマ({self.stone})を置く位置 x y を指定してください >> ")
                choice == "quit" and quit()  # "quit"と入力されたらゲーム終了
                x, y = map(int, choice.split())
                if (x, y) in actions:
                    actions[x, y].put()  # 選択場所と反転場所にコマを置く
                    return
                print("その位置にはコマを置けません。")
            except ValueError:
                print("x座標とy座標の数値を空白を空けて入力してください。")


class OthelloGame:

    def __init__(self, othello, player1, player2):
        self.othello = othello
        self.player1 = player1
        self.player2 = player2

    def play(self):
        print("ゲームスタート")
        self.show()
        player, opponent = self.player1, self.player2
        while self.othello.is_playable():
            player.play(self.othello)
            player, opponent = opponent, player
            self.show()
        print("ゲーム終了")
        self.result()

    def show(self):
        othello, player1, player2 = self.othello, self.player1, self.player2
        print()
        print("  0 1 2 3 4 5 6 7")
        for y, row in enumerate(othello.board):
            print(f"{y}", *row)
        print(f"{player1}のコマ数:", othello.count(player1.stone))
        print(f"{player2}のコマ数:", othello.count(player2.stone))
        print()

    def result(self):
        result = {self.player1.stone: f"{self.player1}の勝ち",
                  self.player2.stone: f"{self.player2}の勝ち",
                  None: "引き分け",
                 }[self.othello.judge()]
        print("結果：", result)


def main():
    othello = Othello()
    player1 = Player(othello.black, "プレーヤー1")
    player2 = Player(othello.white, "プレーヤー2")
    OthelloGame(othello, player1, player2).play()

if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        print()