{
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  {
   "cell_type": "markdown",
   "id": "1b14f05c",
   "metadata": {},
   "source": [
    "# 15-10 · Практика: пути и CWD\n",
    "\n",
    "Практика к разделу [«Практика: пути и CWD»](../../site/chapters/glava-15/15-10-praktika-puti-i-cwd.html)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e5dd331b",
   "metadata": {},
   "source": [
    "## Рабочий пример — путь относительно базовой папки"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "9429389b",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-08-18T15:52:55.416544Z",
     "iopub.status.busy": "2026-08-18T15:52:55.416413Z",
     "iopub.status.idle": "2026-08-18T15:52:55.440588Z",
     "shell.execute_reply": "2026-08-18T15:52:55.440093Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "False True\n"
     ]
    }
   ],
   "source": [
    "from pathlib import Path\n",
    "\n",
    "BASE_DIR = Path.cwd()\n",
    "data_dir = BASE_DIR / \"data\"\n",
    "data_dir.mkdir(exist_ok=True)\n",
    "\n",
    "file_path = data_dir / \"otchet.txt\"\n",
    "file_path.unlink(missing_ok=True)   # для повторяемости примера при повторном запуске\n",
    "existed_before = file_path.exists()\n",
    "file_path.write_text(\"готово\", encoding=\"utf-8\")\n",
    "existed_after = file_path.exists()\n",
    "print(existed_before, existed_after)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5dd06df3",
   "metadata": {},
   "source": [
    "## Задание ★★ Самостоятельная задача\n",
    "\n",
    "Постройте путь к родителю родителя `data_dir` и убедитесь, что это тот же путь, что и `BASE_DIR.parent`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "ca2a8445",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-08-18T15:52:55.441953Z",
     "iopub.status.busy": "2026-08-18T15:52:55.441824Z",
     "iopub.status.idle": "2026-08-18T15:52:55.444329Z",
     "shell.execute_reply": "2026-08-18T15:52:55.443965Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n"
     ]
    }
   ],
   "source": [
    "from pathlib import Path\n",
    "\n",
    "BASE_DIR = Path.cwd()\n",
    "data_dir = BASE_DIR / \"data\"\n",
    "sovpadaet = data_dir.parent.parent == BASE_DIR.parent\n",
    "print(sovpadaet)"
   ]
  }
 ],
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