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   "id": "29468b18-8654-4914-a68e-76c1a7f01c49",
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   "source": [
    "from abc import ABC, abstractmethod\n",
    "\n",
    "class Command(ABC):\n",
    "    \"\"\"Интерфейс команды (паттерн Command).\"\"\"\n",
    "    \n",
    "    @abstractmethod\n",
    "    def execute(self) -> None:\n",
    "        \"\"\"Выполнить команду.\"\"\"\n",
    "        pass\n",
    "    \n",
    "    @abstractmethod\n",
    "    def undo(self) -> None:\n",
    "        \"\"\"Отменить команду.\"\"\"\n",
    "        pass"
   ]
  }
 ],
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