{
 "cells": [
  {
   "cell_type": "markdown",
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   "metadata": {},
   "source": [
    "# 14-23 · dataclasses\n",
    "\n",
    "Praktyka do rozdziału [„dataclasses”](/pl/chapters/rozdzial-14/14-23-dataclasses.html)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e5cd1355",
   "metadata": {},
   "source": [
    "## Cel\n",
    "\n",
    "@dataclass i field(default_factory=...) - Unikanie pułapki zmiennej wartości domyślnej."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "340f2c53",
   "metadata": {},
   "source": [
    "## Sprawa robocza"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "f311901c",
   "metadata": {},
   "outputs": [],
   "source": [
    "from dataclasses import dataclass, field\n",
    "\n",
    "@dataclass\n",
    "class Korzina:\n",
    "    tovary: list = field(default_factory=list)\n",
    "\n",
    "    def dobavit(self, tovar):\n",
    "        self.tovary.append(tovar)\n",
    "\n",
    "k1 = Korzina()\n",
    "k2 = Korzina()\n",
    "k1.dobavit(\"Хлеб\")\n",
    "print(k1.tovary, k2.tovary)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0e161fd9",
   "metadata": {},
   "source": [
    "## Podstawowa praktyka zadań ★\n",
    "\n",
    "Stwórz trzeci wózek `k3` i upewnij się, że zaczyna się pusto, niezależnie od `k1` oraz `k2`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "84ef7033",
   "metadata": {},
   "outputs": [],
   "source": [
    "k3 = Korzina()\n",
    "k3.dobavit(\"Молоко\")\n",
    "print(k1.tovary, k2.tovary, k3.tovary)"
   ]
  }
 ],
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