{
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  {
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   "source": [
    "# 11-16 · Ссылки, aliasing, == и is\n",
    "\n",
    "Практика к разделу [«Ссылки, aliasing, == и is»](../../site/chapters/glava-11/11-16-ssylki-aliasing.html)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "d7878d30",
   "metadata": {},
   "source": [
    "## Цель\n",
    "\n",
    "Отличить aliasing от копирования, == от is."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "ca9935f1",
   "metadata": {},
   "source": [
    "## Рабочий пример"
   ]
  },
  {
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   "execution_count": 1,
   "id": "12f09c5a",
   "metadata": {
    "execution": {
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     "iopub.status.busy": "2026-08-17T14:44:42.092560Z",
     "iopub.status.idle": "2026-08-17T14:44:42.109081Z",
     "shell.execute_reply": "2026-08-17T14:44:42.108592Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[1, 2, 3, 4]\n",
      "[1, 2, 3, 4]\n"
     ]
    }
   ],
   "source": [
    "a = [1, 2, 3]\n",
    "b = a\n",
    "b.append(4)\n",
    "print(a)\n",
    "print(b)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "c208de32",
   "metadata": {},
   "source": [
    "## Задание ★ Базовая практика\n",
    "\n",
    "Дано `x = [10, 20]`. Создайте `y` как НАСТОЯЩУЮ копию x через `.copy()`, добавьте в y значение 30. Затем создайте `z = [10, 20, 30]` и сравните `z` с `y` через `==` и `is`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "2f88dfcb",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-08-17T14:44:42.110073Z",
     "iopub.status.busy": "2026-08-17T14:44:42.109968Z",
     "iopub.status.idle": "2026-08-17T14:44:42.112369Z",
     "shell.execute_reply": "2026-08-17T14:44:42.111971Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[10, 20] [10, 20, 30] True False\n"
     ]
    }
   ],
   "source": [
    "x = [10, 20]\n",
    "y = x.copy()\n",
    "y.append(30)\n",
    "\n",
    "z = [10, 20, 30]\n",
    "ravny = (z == y)\n",
    "odin_i_tot_zhe = (z is y)\n",
    "\n",
    "print(x, y, ravny, odin_i_tot_zhe)"
   ]
  }
 ],
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