Notebooks from ckaufmann/akis-python-framework@45da95e0

16-objektbeziehungen/01-smartphone-sol.ipynb

+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Smartphone\n",
+    "\n",
+    "Gegeben sei eine Klasse `Smartphone` mit dem Attribut `model`."
+   ],
+   "id": "0001-84dad4d119684fc3e7dadaa844c7c44fa65743dac0121eef85a1995dcac"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "style": "python"
+   },
+   "outputs": [],
+   "source": [
+    "class Smartphone:\n",
+    "    def __init__(self, model):\n",
+    "        self.model = model\n",
+    "\n",
+    "    # __eq__ wird bei a == b mit self=a und other=b aufgerufen\n",
+    "    def __eq__(self, other):\n",
+    "        return self.model == other.model"
+   ],
+   "id": "0002-a1718e279341c1963428a563f37b85ec5b37ec21f0f07582c3fac30e3c5"
+  },
+  {
+   "cell_type": "markdown",
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\" /></p>\n",
+    "\n",
+    "Kim und Mika teilen sich ein Smartphone. Toni hat ein eigenes. Alle\n",
+    "haben das gleiche Smartphone (Modell). Erstellen Sie drei Variablen\n",
+    "`kims_phone`, `mika_phone` und `tonis_phone` vom Typ `Smartphone` mit\n",
+    "folgenden Eigenschaften:"
+   ],
+   "id": "0004-fac61a1dac817d3f21af436c6156999707559468a10ebcb184c97e6179f"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "kims_phone == mikas_phone"
+   ],
+   "id": "0005-974052ac659f7ee4376b4ce2e0be1b15ce3b5b830fde9dab61cb828c768"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "kims_phone is mikas_phone"
+   ],
+   "id": "0006-a66f3d1cc6ac15ac81bd09cf37a00d27d9ee40b8fb0527e5e0e80e7dd56"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "kims_phone == tonis_phone"
+   ],
+   "id": "0007-b9323774c2fec387aaa1c04f9552a8da468f56458a7092be2830834b18e"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "kims_phone is not tonis_phone"
+   ],
+   "id": "0008-03947013f0fd10f0e3ae2dcf2acfebe75b18b3bd35fae874e766f41ff5a"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Lösung\n",
+    "\n",
+    "Die Vergleichsoperatoren `==` und `is` haben unterschiedliche\n",
+    "Funktionsweisen in Python.\n",
+    "\n",
+    "-   Der Operator `==` vergleicht den Wert der beiden Instanzen. Das\n",
+    "    bedeutet, dass zwei Instanzen als gleich betrachtet werden, wenn\n",
+    "    ihre Attribute den gleichen Wert haben.\n",
+    "-   Der Operator `is` vergleicht die Identität der Objekte. Zwei\n",
+    "    Instanzen sind nur dann identisch (`is` liefert `True`), wenn es\n",
+    "    sich um dasselbe Objekt im Speicher handelt.\n",
+    "\n",
+    "Anhand der Klasse `Smartphone` können wir dies verdeutlichen:"
+   ],
+   "id": "0012-582bf914ed9c3e087c489945c7e0bdcf8aa7a0fc8c1c07709b0f98ff5c6"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "style": "python"
+   },
+   "outputs": [],
+   "source": [
+    "kims_phone = Smartphone('Pixel')\n",
+    "mikas_phone = kims_phone\n",
+    "tonis_phone = Smartphone('Pixel')"
+   ],
+   "id": "0013-443ac731c7a0525dac7652893c1ff3e0465f0989b5e4dfb6ba5ad7893f7"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Kim, Mika und Toni haben alle das gleiche Smartphone (Vergleich der\n",
+    "Attribute `model` mit `==`):"
+   ],
+   "id": "0014-8ba4a303f808d8734ba14a636da02cb6f6108978df835fc58a7d380c675"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "kims_phone == mikas_phone == tonis_phone"
+   ],
+   "id": "0015-303a7a2394809d01e6609c38001ebdfd4f1e9f682278087cd6ed639a436"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Kim und Mika haben dasselbe Smartphone (Vergleich der Objekte mit `is`):"
+   ],
+   "id": "0016-7773ab05b316f76f67dce7a240429ee5a87be114e996ff90f7fbe28afde"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "kims_phone is mikas_phone"
+   ],
+   "id": "0017-a66f3d1cc6ac15ac81bd09cf37a00d27d9ee40b8fb0527e5e0e80e7dd56"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Aber Toni hat ein eigenes Smartphone (Vergleich der Objekte mit\n",
+    "`is not`):"
+   ],
+   "id": "0018-85e54df55b13eea78037f5de907d81b8ba6e335f0e4514ccbc5a3da4a92"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "kims_phone is not tonis_phone"
+   ],
+   "id": "0019-03947013f0fd10f0e3ae2dcf2acfebe75b18b3bd35fae874e766f41ff5a"
+  }
+ ],
+ "nbformat": 4,
+ "nbformat_minor": 5,
+ "metadata": {}
+}

16-objektbeziehungen/01-smartphone.ipynb

+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Smartphone\n",
+    "\n",
+    "Gegeben sei eine Klasse `Smartphone` mit dem Attribut `model`."
+   ],
+   "id": "0001-84dad4d119684fc3e7dadaa844c7c44fa65743dac0121eef85a1995dcac"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "style": "python"
+   },
+   "outputs": [],
+   "source": [
+    "class Smartphone:\n",
+    "    def __init__(self, model):\n",
+    "        self.model = model\n",
+    "\n",
+    "    # __eq__ wird bei a == b mit self=a und other=b aufgerufen\n",
+    "    def __eq__(self, other):\n",
+    "        return self.model == other.model"
+   ],
+   "id": "0002-a1718e279341c1963428a563f37b85ec5b37ec21f0f07582c3fac30e3c5"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<p><img\n",
+    "src=\"data:image/svg+xml;base64,<?xml version="1.0" encoding="UTF-8"?>
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\" /></p>\n",
+    "\n",
+    "Kim und Mika teilen sich ein Smartphone. Toni hat ein eigenes. Alle\n",
+    "haben das gleiche Smartphone (Modell). Erstellen Sie drei Variablen\n",
+    "`kims_phone`, `mika_phone` und `tonis_phone` vom Typ `Smartphone` mit\n",
+    "folgenden Eigenschaften:"
+   ],
+   "id": "0004-fac61a1dac817d3f21af436c6156999707559468a10ebcb184c97e6179f"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "kims_phone == mikas_phone"
+   ],
+   "id": "0005-974052ac659f7ee4376b4ce2e0be1b15ce3b5b830fde9dab61cb828c768"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "kims_phone is mikas_phone"
+   ],
+   "id": "0006-a66f3d1cc6ac15ac81bd09cf37a00d27d9ee40b8fb0527e5e0e80e7dd56"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "kims_phone == tonis_phone"
+   ],
+   "id": "0007-b9323774c2fec387aaa1c04f9552a8da468f56458a7092be2830834b18e"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "kims_phone is not tonis_phone"
+   ],
+   "id": "0008-03947013f0fd10f0e3ae2dcf2acfebe75b18b3bd35fae874e766f41ff5a"
+  }
+ ],
+ "nbformat": 4,
+ "nbformat_minor": 5,
+ "metadata": {}
+}

16-objektbeziehungen/03-studenten-sol.ipynb

+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Studenten Inplace\n",
+    "\n",
+    "Es gibt Studentendaten (Name und Punkte) zu einem Kurs, der als Liste\n",
+    "repräsentiert wird:"
+   ],
+   "id": "0001-d271d60ff2a6086114e6075c3c09b6b4a4d3b33662b15c9380be449e8d0"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "style": "python"
+   },
+   "outputs": [],
+   "source": [
+    "class Student:\n",
+    "    def __init__(self, name, points):\n",
+    "        self.name = name\n",
+    "        self.points = points\n",
+    "\n",
+    "\n",
+    "course = [\n",
+    "    Student('Kim', 15),\n",
+    "    Student('Toni', 12),\n",
+    "    Student('Mika', 5),\n",
+    "]"
+   ],
+   "id": "0002-3b52fe0e288786a45b7d913f0e14fb2803f9e5db521d16a4fcb15e0e491"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Schreiben Sie eine Funktion `anonymize`, die eine Liste von Studenten\n",
+    "erhält und die Namen der Studenten auf `None` setzt. Es gibt noch einen\n",
+    "zweiten Parameter `inplace`, der standardmäßig auf `False` gesetzt ist.\n",
+    "\n",
+    "-   Falls `inplace=False`, soll sie die ursprünglichen Objekte nicht\n",
+    "    ändern, sondern eine neue Liste zurückgeben.\n",
+    "-   Falls `inplace=True`, soll sie die ursprünglichen Objekte ändern und\n",
+    "    nichts zurückgeben.\n",
+    "\n",
+    "## Lösung\n",
+    "\n",
+    "Im Fall von `inplce=True` durchlaufen wir die Liste in einer\n",
+    "`for`-Schleife und setzen einfach die Namen auf `None`. Im Fall von\n",
+    "`inplace=False` erstellen wir einfach eine Liste mit `Student`-Objekten\n",
+    "mit den Originalpunkten aber `None` für den Namen."
+   ],
+   "id": "0006-332b309684465bda65f6c123aa70efea4b165fcf369a7df98045f8a85e6"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "style": "python"
+   },
+   "outputs": [],
+   "source": [
+    "def anonymize(course, inplace=False):\n",
+    "    if inplace:\n",
+    "        for student in course:\n",
+    "            student.name = None\n",
+    "    else:\n",
+    "        return [Student(None, student.points) for student in course]"
+   ],
+   "id": "0007-ed3b6fa0e6d5f5d1e3aab6a6ada86172d3bd2267804bb7ac9e37496b024"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Ein bekanntes Beispiel für eine Methode, die ein Objekt modifiziert und\n",
+    "nichts zurück gibt, ist\n",
+    "[`sort`](https://docs.python.org/3/library/stdtypes.html#list.sort) des\n",
+    "Typs `list`, während die Funktion\n",
+    "[`sorted`](https://docs.python.org/3/library/functions.html#sorted) eine\n",
+    "neue Liste zurück gibt. Weiterhin hat `pandas` viele Funktionen mit\n",
+    "einem `inplace`-Parameter, wie z. B.\n",
+    "[`drop`](https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.drop.html).\n",
+    "\n",
+    "## Tests\n",
+    "\n",
+    "Zunächst testen wir den Fall `inplace=False`. Wir sehen, dass der erste\n",
+    "Name in der zurückgegebenen Liste `None` ist:"
+   ],
+   "id": "0010-4977eeed7ca5fd880c44559a5a090eb47f402cc5f5c43dd85cee6254616"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "anon_course = anonymize(course)\n",
+    "anon_course[0].name is None"
+   ],
+   "id": "0011-3da0166feaf1d7044676e1a2eea0c2dae1c9eb8dc060d0ff79d909694a1"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Und die Originalobjekte wurden (noch) nicht verändert:"
+   ],
+   "id": "0012-4d1d7688a4a2e7872facf4175ca58909aa76a4c67e6de1c489b87d90dd2"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "course[0].name == 'Kim'"
+   ],
+   "id": "0013-e0a60b3271e2ce0af5377c041f0ad92d1f181236f624770f07748ab75bd"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Mit `inplace=True` werden nun die Namen in den Originalobjekten auf\n",
+    "`None` gesetzt."
+   ],
+   "id": "0014-2693f747e50ecf6b5fc1bd038562564dcfbeb90d7fb9091667b29da211a"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "anonymize(course, inplace=True)\n",
+    "course[0].name is None"
+   ],
+   "id": "0015-dfc050a37713b50c0315af89c0831989e572a2a95427c8b916218a4d5e9"
+  }
+ ],
+ "nbformat": 4,
+ "nbformat_minor": 5,
+ "metadata": {}
+}

16-objektbeziehungen/03-studenten.ipynb

+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Studenten Inplace\n",
+    "\n",
+    "Es gibt Studentendaten (Name und Punkte) zu einem Kurs, der als Liste\n",
+    "repräsentiert wird:"
+   ],
+   "id": "0001-d271d60ff2a6086114e6075c3c09b6b4a4d3b33662b15c9380be449e8d0"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "style": "python"
+   },
+   "outputs": [],
+   "source": [
+    "class Student:\n",
+    "    def __init__(self, name, points):\n",
+    "        self.name = name\n",
+    "        self.points = points\n",
+    "\n",
+    "\n",
+    "course = [\n",
+    "    Student('Kim', 15),\n",
+    "    Student('Toni', 12),\n",
+    "    Student('Mika', 5),\n",
+    "]"
+   ],
+   "id": "0002-3b52fe0e288786a45b7d913f0e14fb2803f9e5db521d16a4fcb15e0e491"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Schreiben Sie eine Funktion `anonymize`, die eine Liste von Studenten\n",
+    "erhält und die Namen der Studenten auf `None` setzt. Es gibt noch einen\n",
+    "zweiten Parameter `inplace`, der standardmäßig auf `False` gesetzt ist.\n",
+    "\n",
+    "-   Falls `inplace=False`, soll sie die ursprünglichen Objekte nicht\n",
+    "    ändern, sondern eine neue Liste zurückgeben.\n",
+    "-   Falls `inplace=True`, soll sie die ursprünglichen Objekte ändern und\n",
+    "    nichts zurückgeben.\n",
+    "\n",
+    "Hier ist der Startcode:"
+   ],
+   "id": "0005-cd92af835c4c665dde68a6613139fcf7ff487da47c58381fc05f7728711"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "style": "python"
+   },
+   "outputs": [],
+   "source": [
+    "def anonymize(course, inplace=False):\n",
+    "    pass"
+   ],
+   "id": "0006-39cfbdfd89281ca4756a7906dd832b019904e25203470e76098a063910c"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Tests\n",
+    "\n",
+    "Zunächst testen wir den Fall `inplace=False`. Wir sehen, dass der erste\n",
+    "Name in der zurückgegebenen Liste `None` ist:"
+   ],
+   "id": "0008-60161c97d67948e2ec2dc6ea608b13d91a2d3a11371fdaf02aff67fb397"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "anon_course = anonymize(course)\n",
+    "anon_course[0].name is None"
+   ],
+   "id": "0009-3da0166feaf1d7044676e1a2eea0c2dae1c9eb8dc060d0ff79d909694a1"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Und die Originalobjekte wurden (noch) nicht verändert:"
+   ],
+   "id": "0010-4d1d7688a4a2e7872facf4175ca58909aa76a4c67e6de1c489b87d90dd2"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "course[0].name == 'Kim'"
+   ],
+   "id": "0011-e0a60b3271e2ce0af5377c041f0ad92d1f181236f624770f07748ab75bd"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Mit `inplace=True` werden nun die Namen in den Originalobjekten auf\n",
+    "`None` gesetzt."
+   ],
+   "id": "0012-2693f747e50ecf6b5fc1bd038562564dcfbeb90d7fb9091667b29da211a"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "True"
+     ]
+    }
+   ],
+   "source": [
+    "anonymize(course, inplace=True)\n",
+    "course[0].name is None"
+   ],
+   "id": "0013-dfc050a37713b50c0315af89c0831989e572a2a95427c8b916218a4d5e9"
+  }
+ ],
+ "nbformat": 4,
+ "nbformat_minor": 5,
+ "metadata": {}
+}

16-objektbeziehungen/04-buecher-sol.ipynb

+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Kopien von Büchern\n",
+    "\n",
+    "Schreibe zwei Funktionen `shallow_copy_books` und `deep_copy_books`, die\n",
+    "flache bzw. tiefe Kopien einer Liste von Büchern erstellt. Die Bücher\n",
+    "sind Instanzen der Klasse `Buch` mit den Attributen `title` (String) und\n",
+    "`authors` (Liste von Strings)."
+   ],
+   "id": "0001-1096b735dca43965e8fd69a1440108c21f58a606d7ed3564b0ce82a5891"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "style": "python"
+   },
+   "outputs": [],
+   "source": [
+    "class Book:\n",
+    "    def __init__(self, title, authors):\n",
+    "        self.title = title\n",
+    "        self.authors = authors\n",
+    "\n",
+    "book1 = Book(\"Harry Potter\", [\"J.K. Rowling\"])\n",
+    "book2 = Book(\"Der Hobbit\", [\"J.R.R. Tolkien\"])\n",
+    "original_books = [book1, book2]   # << copy me"
+   ],
+   "id": "0002-89bedbad503289fdecfea05ad0180c1265e9cb0cbf7083421caf8c1fc8e"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Lösung\n",
+    "\n",
+    "Bei der flachen Kopie (`shallow_copy_books`) wird eine neue Liste\n",
+    "erstellt, die die gleichen Buchobjekte referenziert wie die\n",
+    "Originalliste. Änderungen an den Buchobjekten in der Kopie wirken sich\n",
+    "auch auf die Originalobjekte aus."
+   ],
+   "id": "0004-85639f227e0d31d1de0efa291f32c5a37e32a2777cd7a3d055bdfb6ad31"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "style": "python"
+   },
+   "outputs": [],
+   "source": [
+    "def shallow_copy_books(books):\n",
+    "    \"\"\"\n",
+    "    Erstellt eine flache Kopie der Liste von Büchern.\n",
+    "    \"\"\"\n",
+    "    return books.copy()"
+   ],
+   "id": "0005-f42206793260e071df16e0108d3a8796dcdc77e0b2ba4975aa14014e1d8"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Bei der tiefen Kopie (`deep_copy_books`) wird eine neue Liste erstellt,\n",
+    "und für jedes Buchobjekt in der Originalliste wird ein neues Buchobjekt\n",
+    "erstellt. Die Autorenliste jedes Buches wird ebenfalls kopiert, um eine\n",
+    "unabhängige Referenz herzustellen."
+   ],
+   "id": "0006-5f28a2c990163c46258ec99c775ce8f79a40b90a95eb5c5b3580bb9feff"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "style": "python"
+   },
+   "outputs": [],
+   "source": [
+    "def deep_copy_books(books):\n",
+    "    \"\"\"\n",
+    "    Erstellt eine tiefe Kopie der Liste von Büchern.\n",
+    "    \"\"\"\n",
+    "    return [Book(book.title, book.authors.copy()) for book in books]"
+   ],
+   "id": "0007-e71e1c097ed50ef476003ffc4eaf644ac5b800481f572cd452aa66b9e0a"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Anstatt einer List-Comprehension hätten wir auch `copy.deepcopy(books)`\n",
+    "aus dem [`copy`-Modul](https://docs.python.org/3/library/copy.html)\n",
+    "verwenden können.\n",
+    "\n",
+    "## Test\n",
+    "\n",
+    "Nun testen wir, ob die Buchobjekte bei der flachen Kopie dieselben sind.\n",
+    "Änderungen in der flachen Kopie sollten die Originalobjekte\n",
+    "beeinflussen:"
+   ],
+   "id": "0010-31af62a32b1a011120ec24e2c0f038039fce33996873e7107f237e7ea96"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "Neues Buch"
+     ]
+    }
+   ],
+   "source": [
+    "shallow_copy = shallow_copy_books(original_books)\n",
+    "shallow_copy[0].title = \"Neues Buch\"\n",
+    "print(original_books[0].title)"
+   ],
+   "id": "0011-fdcf1df8c3eb65204657f67c18210ff26563172361104f249eabe5cf179"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Schließlich testen wir, ob die Buchobjekte (inkl. Autorenliste) bei der\n",
+    "tiefen Kopie voneinander unabhängig sind. Änderungen in der tiefen Kopie\n",
+    "sollten die Originalobjekte nicht beeinflussen:"
+   ],
+   "id": "0012-1ffdaf3da853a9ee3b4bdb50d14500cc7f7f034ba3cc1d5555c44993ea3"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "Der Hobbit ['J.R.R. Tolkien']"
+     ]
+    }
+   ],
+   "source": [
+    "deep_copy = deep_copy_books(original_books)\n",
+    "deep_copy[1].title = \"Anderes Buch\"\n",
+    "deep_copy[1].authors += \"Anderer Autor\"\n",
+    "print(original_books[1].title, original_books[1].authors)"
+   ],
+   "id": "0013-46716251c3c50bd3bc0f859f35f30e7956de5b8de591193a88a052649fa"
+  }
+ ],
+ "nbformat": 4,
+ "nbformat_minor": 5,
+ "metadata": {}
+}

16-objektbeziehungen/04-buecher.ipynb

+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Kopien von Büchern\n",
+    "\n",
+    "Schreibe zwei Funktionen `shallow_copy_books` und `deep_copy_books`, die\n",
+    "flache bzw. tiefe Kopien einer Liste von Büchern erstellt. Die Bücher\n",
+    "sind Instanzen der Klasse `Buch` mit den Attributen `title` (String) und\n",
+    "`authors` (Liste von Strings)."
+   ],
+   "id": "0001-1096b735dca43965e8fd69a1440108c21f58a606d7ed3564b0ce82a5891"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "style": "python"
+   },
+   "outputs": [],
+   "source": [
+    "class Book:\n",
+    "    def __init__(self, title, authors):\n",
+    "        self.title = title\n",
+    "        self.authors = authors\n",
+    "\n",
+    "book1 = Book(\"Harry Potter\", [\"J.K. Rowling\"])\n",
+    "book2 = Book(\"Der Hobbit\", [\"J.R.R. Tolkien\"])\n",
+    "original_books = [book1, book2]   # << copy me"
+   ],
+   "id": "0002-89bedbad503289fdecfea05ad0180c1265e9cb0cbf7083421caf8c1fc8e"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "style": "python"
+   },
+   "outputs": [],
+   "source": [
+    "def shallow_copy_books(books):\n",
+    "    # TODO: Implementiere die shallow_copy_books Funktion hier\n",
+    "    pass\n",
+    "\n",
+    "\n",
+    "def deep_copy_books(books):\n",
+    "    # TODO: Implementiere die deep_copy_books Funktion hier\n",
+    "    pass"
+   ],
+   "id": "0003-b21adcd7eaf51a7417a73867063fa61462216946d744bc4d5d5df959e94"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Test\n",
+    "\n",
+    "Nun testen wir, ob die Buchobjekte bei der flachen Kopie dieselben sind.\n",
+    "Änderungen in der flachen Kopie sollten die Originalobjekte\n",
+    "beeinflussen:"
+   ],
+   "id": "0005-865ef6927c719fe90f7c5bade794cd66eccf00c727326fe0c480a07e5d2"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "Neues Buch"
+     ]
+    }
+   ],
+   "source": [
+    "shallow_copy = shallow_copy_books(original_books)\n",
+    "shallow_copy[0].title = \"Neues Buch\"\n",
+    "print(original_books[0].title)"
+   ],
+   "id": "0006-fdcf1df8c3eb65204657f67c18210ff26563172361104f249eabe5cf179"
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Schließlich testen wir, ob die Buchobjekte (inkl. Autorenliste) bei der\n",
+    "tiefen Kopie voneinander unabhängig sind. Änderungen in der tiefen Kopie\n",
+    "sollten die Originalobjekte nicht beeinflussen:"
+   ],
+   "id": "0007-1ffdaf3da853a9ee3b4bdb50d14500cc7f7f034ba3cc1d5555c44993ea3"
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "stream",
+     "name": "stdout",
+     "text": [
+      "Der Hobbit ['J.R.R. Tolkien']"
+     ]
+    }
+   ],
+   "source": [
+    "deep_copy = deep_copy_books(original_books)\n",
+    "deep_copy[1].title = \"Anderes Buch\"\n",
+    "deep_copy[1].authors += \"Anderer Autor\"\n",
+    "print(original_books[1].title, original_books[1].authors)"
+   ],
+   "id": "0008-46716251c3c50bd3bc0f859f35f30e7956de5b8de591193a88a052649fa"
+  }
+ ],
+ "nbformat": 4,
+ "nbformat_minor": 5,
+ "metadata": {}
+}