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   "id": "8998420f-2c73-4f8a-a102-cc403777f3e9",
   "metadata": {},
   "outputs": [],
   "source": [
    "from abc import ABC, abstractmethod\n",
    "\n",
    "class Observer(ABC):\n",
    "    \"\"\"Интерфейс наблюдателя (паттерн Observer).\"\"\"\n",
    "    \n",
    "    @abstractmethod\n",
    "    def update(self, event: str) -> None:\n",
    "        \"\"\"Обработчик события.\"\"\"\n",
    "        pass"
   ]
  }
 ],
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