Tic Tac Toe

tictactoe.ipynb

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      "\n",
      "  1    2    3  \n",
      "  4    5    6  \n",
      "  7    8    9  \n",
      "\n",
      "☻ plays in: 5\n",
      "\n",
      "  1    2    3  \n",
      "  4    ☻    6  \n",
      "  7    8    9  \n",
      "\n",
      "☺ plays in: 3\n",
      "\n",
      "  1    2    ☺  \n",
      "  4    ☻    6  \n",
      "  7    8    9  \n",
      "\n",
      "☻ plays in: 9\n",
      "\n",
      "  1    2    ☺  \n",
      "  4    ☻    6  \n",
      "  7    8    ☻  \n",
      "\n",
      "☺ plays in: 2\n",
      "\n",
      "  1    ☺    ☺  \n",
      "  4    ☻    6  \n",
      "  7    8    ☻  \n",
      "\n",
      "☻ plays in: 1\n",
      "\n",
      "  ☻    ☺    ☺  \n",
      "  4    ☻    6  \n",
      "  7    8    ☻  \n",
      "\n",
      "☻ wins!\n"
     ]
    }
   ],
   "source": [
    "class TicTacToe:\n",
    "    \"\"\"Tic Tac Toe board.\"\"\"\n",
    "\n",
    "    def __init__(self, board=None):\n",
    "        # this element behaves like an immutable one, but nothing really\n",
    "        # enforces it (like using __new__).\n",
    "        self._board = tuple(board) if board else tuple(range(1, 10))\n",
    "\n",
    "    def __str__(self, split=3):\n",
    "        return \"\\n\".join(\"\".join(\"{:^5}\".format(x)\n",
    "                                 for x in self._board[i:i+split])\n",
    "                         for i in range(0, len(self._board), split))\n",
    "\n",
    "    def play(self, player, position):\n",
    "        # throws a ValueError if it's not a int\n",
    "        pos = int(position, 10)\n",
    "        # throws a ValueError if the element doesn't exist in the list.\n",
    "        self._board.index(pos)\n",
    "        return TicTacToe(player if pos == x else x for x in self._board)\n",
    "\n",
    "    @property\n",
    "    def positions(self):\n",
    "        b = self._board\n",
    "        yield b[0::3] # first col\n",
    "        yield b[1::3] # second col\n",
    "        yield b[2::3] # third col\n",
    "        yield b[0:3]  # first row\n",
    "        yield b[3:6]  # second row\n",
    "        yield b[7:9]  # third row\n",
    "        yield b[0::4] # left (back slash) diagonal\n",
    "        yield b[2::2][:3] # right (forward slash) diagonal\n",
    "    \n",
    "    def is_winning(self, player):\n",
    "        win = tuple([player] * 3)\n",
    "        return any(position == win for position in self.positions)\n",
    "\n",
    "\n",
    "# You can skin the board.\n",
    "players = ('☻', '☺')\n",
    "turn = 0\n",
    "board = TicTacToe()\n",
    "\n",
    "while True:\n",
    "    player = players[turn]\n",
    "    print(\"\", board, \"\", sep=\"\\n\")\n",
    "    \n",
    "    position = input(\"{} plays in: \".format(player))\n",
    "\n",
    "    try:\n",
    "        board = board.play(player, position)    \n",
    "    except ValueError:\n",
    "        print(\"Derp!\")\n",
    "        break\n",
    "\n",
    "    if board.is_winning(player):\n",
    "        print(\"\", board, \"\", sep=\"\\n\")\n",
    "        print(\"{} wins!\".format(players[turn]))\n",
    "        break\n",
    "\n",
    "    # Next turn\n",
    "    turn = (turn + 1) % len(players)"
   ]
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