{
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  {
   "cell_type": "markdown",
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   "metadata": {},
   "source": [
    "# 14-10 · Инкапсуляция\n",
    "\n",
    "Практика к разделу [«Инкапсуляция»](../../site/chapters/glava-14/14-10-inkapsulyatsiya.html)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "901bb800",
   "metadata": {},
   "source": [
    "## Цель\n",
    "\n",
    "Защитить состояние объекта, разрешив менять его только через методы."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "400cd45b",
   "metadata": {},
   "source": [
    "## Рабочий пример"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "b56260f4",
   "metadata": {},
   "outputs": [],
   "source": [
    "class Konto:\n",
    "    def __init__(self, balans):\n",
    "        self.__balans = balans\n",
    "\n",
    "    def popolnit(self, summa):\n",
    "        if summa > 0:\n",
    "            self.__balans += summa\n",
    "            return True\n",
    "        return False\n",
    "\n",
    "    def poluchit_balans(self):\n",
    "        return self.__balans\n",
    "\n",
    "schet = Konto(100)\n",
    "schet.popolnit(50)\n",
    "print(schet.poluchit_balans())"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "a2612385",
   "metadata": {},
   "source": [
    "## Задание ★★ Самостоятельная задача\n",
    "\n",
    "Добавьте классу `Konto` метод `snyat(summa)`, который уменьшает `__balans` только если `summa` не превышает текущий баланс, и возвращает `True`/`False` в зависимости от успеха."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "ef537ccf",
   "metadata": {},
   "outputs": [],
   "source": [
    "class Konto:\n",
    "    def __init__(self, balans):\n",
    "        self.__balans = balans\n",
    "\n",
    "    def popolnit(self, summa):\n",
    "        if summa > 0:\n",
    "            self.__balans += summa\n",
    "            return True\n",
    "        return False\n",
    "\n",
    "    def snyat(self, summa):\n",
    "        if 0 < summa <= self.__balans:\n",
    "            self.__balans -= summa\n",
    "            return True\n",
    "        return False\n",
    "\n",
    "    def poluchit_balans(self):\n",
    "        return self.__balans\n",
    "\n",
    "schet = Konto(100)\n",
    "schet.popolnit(50)\n",
    "uspeshno = schet.snyat(30)\n",
    "neuspeshno = schet.snyat(9999)\n",
    "print(schet.poluchit_balans(), uspeshno, neuspeshno)"
   ]
  }
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