{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "66286e50",
   "metadata": {},
   "source": [
    "# 13-15 · Чистые функции и побочные эффекты\n",
    "\n",
    "Практика к разделу [«Вход, работа, выход: чистые функции»](../../site/chapters/glava-13/13-15-funkcii-vhod-vyhod.html)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "056ba30d",
   "metadata": {},
   "source": [
    "## Цель\n",
    "\n",
    "Отличить чистую функцию от функции с побочным эффектом."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "850abf03",
   "metadata": {},
   "source": [
    "## Задание ★ Базовая практика"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "e42b79d6",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-08-17T18:54:01.205130Z",
     "iopub.status.busy": "2026-08-17T18:54:01.205014Z",
     "iopub.status.idle": "2026-08-17T18:54:01.224793Z",
     "shell.execute_reply": "2026-08-17T18:54:01.224340Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "20 ['Нарисован квадрат 10']\n"
     ]
    }
   ],
   "source": [
    "def rectangle_area(width, height):\n",
    "    return width * height\n",
    "\n",
    "log = []\n",
    "\n",
    "def draw_square_effect(size):\n",
    "    log.append(f\"Нарисован квадрат {size}\")\n",
    "\n",
    "area = rectangle_area(4, 5)\n",
    "draw_square_effect(10)\n",
    "\n",
    "print(area, log)"
   ]
  }
 ],
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