{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "f795f928",
   "metadata": {},
   "source": [
    "# 14-13 · Композиция\n",
    "\n",
    "Практика к разделу [«Композиция: объекты внутри объектов»](../../site/chapters/glava-14/14-13-kompozitsiya.html)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0dc56e27",
   "metadata": {},
   "source": [
    "## Цель\n",
    "\n",
    "Один объект хранит другой объект (HAS-A) и делегирует ему работу."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "166c732b",
   "metadata": {},
   "source": [
    "## Рабочий пример"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "15510e9f",
   "metadata": {},
   "outputs": [],
   "source": [
    "class Motor:\n",
    "    def __init__(self, moshchnost):\n",
    "        self.moshchnost = moshchnost\n",
    "\n",
    "    def start(self):\n",
    "        return f\"Двигатель мощностью {self.moshchnost} л.с. запущен\"\n",
    "\n",
    "\n",
    "class Avtomobil:\n",
    "    def __init__(self, moshchnost):\n",
    "        self.dvigatel = Motor(moshchnost)\n",
    "\n",
    "    def start(self):\n",
    "        return self.dvigatel.start()\n",
    "\n",
    "mashina = Avtomobil(150)\n",
    "print(mashina.start())"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "dc2c921a",
   "metadata": {},
   "source": [
    "## Задание ★★ Самостоятельная задача\n",
    "\n",
    "Добавьте `Avtomobil` метод `opisanie()`, возвращающий строку с мощностью двигателя, обращаясь к `self.dvigatel.moshchnost`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "4130c598",
   "metadata": {},
   "outputs": [],
   "source": [
    "class Motor:\n",
    "    def __init__(self, moshchnost):\n",
    "        self.moshchnost = moshchnost\n",
    "\n",
    "    def start(self):\n",
    "        return f\"Двигатель мощностью {self.moshchnost} л.с. запущен\"\n",
    "\n",
    "\n",
    "class Avtomobil:\n",
    "    def __init__(self, moshchnost):\n",
    "        self.dvigatel = Motor(moshchnost)\n",
    "\n",
    "    def start(self):\n",
    "        return self.dvigatel.start()\n",
    "\n",
    "    def opisanie(self):\n",
    "        return f\"Автомобиль с двигателем {self.dvigatel.moshchnost} л.с.\"\n",
    "\n",
    "mashina = Avtomobil(150)\n",
    "print(mashina.opisanie())"
   ]
  }
 ],
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