{
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  {
   "cell_type": "markdown",
   "id": "e24785d1",
   "metadata": {},
   "source": [
    "# 17-04 · Рисуем на кнопке\n",
    "\n",
    "Практика к разделу [«При нажатии на кнопку рисуем на ней»](../../site/chapters/glava-17/17-04-risuem-na-knopke.html)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f14721a1",
   "metadata": {},
   "source": [
    "## Цель\n",
    "\n",
    "Обработать клик по клетке поля с правильной лямбдой."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e26225a3",
   "metadata": {},
   "source": [
    "## Про mainloop() в этом ноутбуке\n",
    "\n",
    "Вместо `root.mainloop()` здесь используется `root.update()` + `root.destroy()` — приложение строится точно так же, просто без бесконечного ожидания в конце (см. объяснение в ноутбуках главы 16)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "afbac799",
   "metadata": {},
   "source": [
    "## Типичная ошибка — lambda без i=indeks"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "70fa0de2",
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    "execution": {
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     "iopub.status.busy": "2026-08-14T21:02:27.055259Z",
     "iopub.status.idle": "2026-08-14T21:02:27.172942Z",
     "shell.execute_reply": "2026-08-14T21:02:27.172414Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Неправильно: [2, 2, 2]\n"
     ]
    }
   ],
   "source": [
    "import tkinter as tk\n",
    "\n",
    "root = tk.Tk()\n",
    "klikov = []\n",
    "\n",
    "def obrabotat(indeks):\n",
    "    klikov.append(indeks)\n",
    "\n",
    "# ОШИБКА: все кнопки запомнят одно и то же значение indeks (последнее — 2)\n",
    "knopki_nepravilno = []\n",
    "for indeks in range(3):\n",
    "    b = tk.Button(root, text=str(indeks), command=lambda: obrabotat(indeks))\n",
    "    knopki_nepravilno.append(b)\n",
    "\n",
    "for b in knopki_nepravilno:\n",
    "    b.invoke()\n",
    "\n",
    "print(\"Неправильно:\", klikov)  # все три клика запишут одно и то же число!"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7da0ea07",
   "metadata": {},
   "source": [
    "## Исправление — lambda с i=indeks"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "c658bb42",
   "metadata": {
    "execution": {
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     "iopub.status.busy": "2026-08-14T21:02:27.173898Z",
     "iopub.status.idle": "2026-08-14T21:02:27.178123Z",
     "shell.execute_reply": "2026-08-14T21:02:27.177678Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Правильно: [0, 1, 2]\n"
     ]
    }
   ],
   "source": [
    "klikov_pravilno = []\n",
    "\n",
    "def obrabotat2(indeks):\n",
    "    klikov_pravilno.append(indeks)\n",
    "\n",
    "knopki_pravilno = []\n",
    "for indeks in range(3):\n",
    "    b = tk.Button(root, text=str(indeks), command=lambda i=indeks: obrabotat2(i))\n",
    "    knopki_pravilno.append(b)\n",
    "\n",
    "for b in knopki_pravilno:\n",
    "    b.invoke()\n",
    "\n",
    "print(\"Правильно:\", klikov_pravilno)  # 0, 1, 2 — как и ожидалось\n",
    "root.update()\n",
    "root.destroy()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5c7ec6e8",
   "metadata": {},
   "source": [
    "## Задание ★★ Самостоятельная задача\n",
    "\n",
    "Соберите функцию na_knopku_nazhali(), которая рисует X или O и переключает игрока, и проверьте её на трёх кликах."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "3185ca3f",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-08-14T21:02:27.179255Z",
     "iopub.status.busy": "2026-08-14T21:02:27.179121Z",
     "iopub.status.idle": "2026-08-14T21:02:27.244843Z",
     "shell.execute_reply": "2026-08-14T21:02:27.244391Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['X', 'O', 'X']\n"
     ]
    }
   ],
   "source": [
    "root = tk.Tk()\n",
    "tekuschij_igrok = \"X\"\n",
    "polya = []\n",
    "\n",
    "def na_knopku_nazhali(indeks):\n",
    "    global tekuschij_igrok\n",
    "    if polya[indeks][\"text\"] != \"\":\n",
    "        return\n",
    "    polya[indeks][\"text\"] = tekuschij_igrok\n",
    "    tekuschij_igrok = \"O\" if tekuschij_igrok == \"X\" else \"X\"\n",
    "\n",
    "for indeks in range(9):\n",
    "    b = tk.Button(root, text=\"\", command=lambda i=indeks: na_knopku_nazhali(i))\n",
    "    polya.append(b)\n",
    "\n",
    "na_knopku_nazhali(0)\n",
    "na_knopku_nazhali(1)\n",
    "na_knopku_nazhali(2)\n",
    "\n",
    "print([b[\"text\"] for b in polya[:3]])  # X, O, X\n",
    "root.update()\n",
    "root.destroy()"
   ]
  }
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