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<title>Kapitel 05: Komposition und Playlists</title>
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<span>🌱 1. Grundlagen</span>
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<span style="background: rgba(255,255,255,0.1); padding: 2px 6px; border-radius: 99px; font-size: 0.7rem;">G01–G10</span>
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<span class="sidebar-link-icon">🧮</span>
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<span class="sidebar-link-text">G01. Taschenrechner</span>
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<span class="sidebar-link-text">G02. Variablen & Typen</span>
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<span class="sidebar-link-text">G03. Ein- & Ausgabe</span>
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<span class="sidebar-link-text">G04. Bedingungen (if)</span>
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<span class="sidebar-link-text">G05. Schleifen (for/while)</span>
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<span class="sidebar-link-text">G06. Funktionen & Module</span>
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<span class="sidebar-link-icon">📋</span>
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<span class="sidebar-link-text">G07. Listen & Sequenzen</span>
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<span class="sidebar-link-icon">🔤</span>
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<span class="sidebar-link-text">G08. String-Methoden</span>
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<a href="../../lehrpfad_1_grundlagen/09_dictionaries_und_sets/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🗃️</span>
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<span class="sidebar-link-text">G09. Dicts & Sets</span>
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<span class="sidebar-link-icon">🚀</span>
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<span class="sidebar-link-text">G10. Comprehensions</span>
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<div class="sidebar-group-title">
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<span>🏗️ 2. OOP Einstieg</span>
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<span style="background: rgba(255,255,255,0.1); padding: 2px 6px; border-radius: 99px; font-size: 0.7rem;">00–06</span>
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<div style="display: flex; flex-direction: column; gap: 2px;">
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<a href="../../lehrpfad_2_oop_einstieg/00_fehlersuche_und_grundlagen/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🔍</span>
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<span class="sidebar-link-text">00. Fehlersuche & Debug</span>
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<a href="../../lehrpfad_2_oop_einstieg/01_einstieg_klassen/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🏗️</span>
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<span class="sidebar-link-text">01. Einstieg in Klassen</span>
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</a>
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<a href="../../lehrpfad_2_oop_einstieg/02_init_und_self/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">⚙️</span>
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<span class="sidebar-link-text">02. Konstruktor & self</span>
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<a href="../../lehrpfad_2_oop_einstieg/03_methoden_und_verhalten/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🏎️</span>
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<span class="sidebar-link-text">03. Methoden & Verhalten</span>
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<a href="../../lehrpfad_2_oop_einstieg/04_str_und_darstellung/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🧾</span>
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<span class="sidebar-link-text">04. __str__ Darstellung</span>
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<a href="../../lehrpfad_2_oop_einstieg/04b_umstieg_vscode/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">💻</span>
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<span class="sidebar-link-text">04b. VS Code Setup</span>
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<a href="../../lehrpfad_2_oop_einstieg/04c_git_und_versionskontrolle/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🌿</span>
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<span class="sidebar-link-text">04c. Git-Versionskontrolle</span>
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</a>
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<a href="../../lehrpfad_2_oop_einstieg/05_objekte_kombinieren/index.html" class="sidebar-link active">
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<span class="sidebar-link-icon">🎵</span>
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<span class="sidebar-link-text">05. Objekte kombinieren</span>
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</a>
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<a href="../../lehrpfad_2_oop_einstieg/06_abschlussprojekt_tamagotchi/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🥚</span>
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<span class="sidebar-link-text">06. Projekt: Tamagotchi</span>
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<div class="sidebar-group">
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<div class="sidebar-group-title">
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<span>🚀 3. Fortgeschritten</span>
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<span style="background: rgba(255,255,255,0.1); padding: 2px 6px; border-radius: 99px; font-size: 0.7rem;">07–16</span>
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</div>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/07_referenzen_und_speicher/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🧠</span>
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<span class="sidebar-link-text">07. Referenzen & Speicher</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/08_operator_overloading_dunder/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">➕</span>
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<span class="sidebar-link-text">08. Operator Overloading</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/09_eigene_unit_tests_schreiben/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🧪</span>
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<span class="sidebar-link-text">09. Unit Tests & TDD</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/10_vererbung_und_super/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🧬</span>
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<span class="sidebar-link-text">10. Vererbung & super()</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/11_polymorphie_und_interfaces/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🎭</span>
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<span class="sidebar-link-text">11. Polymorphie</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/12_exceptions_und_fehlerbehandlung/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🛡️</span>
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<span class="sidebar-link-text">12. Exceptions & Fehler</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/13_persistenz_json_und_csv/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">💾</span>
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<span class="sidebar-link-text">13. Persistenz (JSON/CSV)</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/14_gui_mit_tkinter/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🖥️</span>
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<span class="sidebar-link-text">14. Desktop-GUIs (Tkinter)</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/15_parameter_und_container/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🎒</span>
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<span class="sidebar-link-text">15. Container & *args</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/16_master_abschlussprojekt/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🏆</span>
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<span class="sidebar-link-text">16. Master-Abschlussprojekt</span>
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</a>
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</div>
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</div>
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</div>
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<div class="sidebar-footer">
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<div style="font-size: 0.85rem; font-weight: 700; color: white;" id="sidebar-level-text">⭐ Level 1</div>
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<div style="font-size: 0.82rem; font-weight: 700; color: #38bdf8;" id="sidebar-xp-text">0 XP</div>
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<header>
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<a href="../../index.html">🏠 Zur Kursübersicht</a>
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<span>›</span>
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<a href="../04c_git_und_versionskontrolle/index.html">Kapitel 04c (Git)</a>
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<span>›</span>
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<span style="color: white; font-weight: 600;">Kapitel 05</span>
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</nav>
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<div class="header-badge">Kapitel 05</div>
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<h1>Komposition: Objekte kombinieren & filtern 🎵</h1>
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<p>Baue einen eigenen Spotify-Playlist-Manager und lerne, wie Objekte andere Objekte suchen, berechnen und filtern.</p>
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</div>
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</header>
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<main class="container">
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<!-- 📂 Schnellzugriff & Download aller Dateien dieser Einheit -->
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<div style="background: #ffffff; border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 14px 20px; margin-bottom: 25px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; box-shadow: var(--shadow-sm);">
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<div style="font-weight: 700; color: var(--text-main); display: flex; align-items: center; gap: 8px;">
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<span>📂 Dateien dieser Einheit:</span>
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</div>
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<div style="display: flex; gap: 10px; flex-wrap: wrap;">
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<a href="../../workspace.html?course=python&track=lehrpfad_2_oop_einstieg&chapter=05_objekte_kombinieren" class="btn" style="background: #10b981; color: #fff; font-weight: 700;">💻 In Web-IDE öffnen →</a>
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<a href="aufgabe.py" class="btn" style="padding: 6px 14px; font-size: 0.88rem; background: var(--primary);" download>📄 aufgabe.py (Startercode)</a>
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<a href="test_aufgabe.py" class="btn btn-secondary" style="padding: 6px 14px; font-size: 0.88rem;" download>🧪 test_aufgabe.py (Tests)</a>
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<a href="musterloesung.py" class="btn btn-secondary" style="padding: 6px 14px; font-size: 0.88rem;" download>💡 musterloesung.py (Lösung)</a>
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<a href="README.md" class="btn btn-secondary" style="padding: 6px 14px; font-size: 0.88rem;">📖 README.md</a>
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</div>
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</div>
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||
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<!-- 1. Was ist Komposition -->
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<section class="card">
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<h2>1. Was ist Komposition?</h2>
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<p>
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In großen Anwendungen (wie Spotify, Netflix oder Schulsoftware) arbeiten viele Klassen zusammen. Wenn eine Klasse Objekte einer anderen Klasse als Attribute speichert, nennt man das <strong>Komposition</strong> (oder *"hat-ein"-Beziehung*):
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</p>
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<ul style="margin-left: 20px; margin-bottom: 15px;">
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<li>Eine <strong>Schulklasse</strong> <em>hat</em> viele <strong>Schüler</strong>.</li>
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<li>Eine <strong>Playlist</strong> <em>hat</em> viele <strong>Songs</strong>.</li>
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<li>Ein <strong>Kino</strong> <em>hat</em> viele <strong>Säle</strong>.</li>
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</ul>
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</section>
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<!-- 2. Vollständiges Beispiel: Notenmanager -->
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<section class="card">
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<h2>2. 🎒 Vollständiges Beispiel: Schüler & Schulklasse Notenmanager</h2>
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<p>Hier siehst du ein vollständiges Beispiel aus dem Schulalltag: Die Klasse <code>Schueler</code> speichert Name und Note. Die Klasse <code>Schulklasse</code> verwaltet alle Schüler, berechnet den Notendurchschnitt und sucht die Klassenbesten:</p>
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<div class="code-container">
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<div class="code-header">
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<div class="code-dots">
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<span class="code-dot dot-red"></span>
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<span class="code-dot dot-yellow"></span>
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<span class="code-dot dot-green"></span>
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</div>
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<span>Python (Komplettes Beispiel: schulklasse.py)</span>
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</div>
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<pre><span class="cm"># ==============================================================================</span>
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<span class="cm"># KLASSE 1: Ein einzelner Schüler</span>
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<span class="cm"># ==============================================================================</span>
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<span class="kw">class</span> <span class="fn">Schueler</span>:
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<span class="kw">def</span> <span class="fn">__init__</span>(<span class="var">self</span>, <span class="var">name</span>, <span class="var">note</span>):
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<span class="var">self</span>.<span class="attr">name</span> = <span class="var">name</span>
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<span class="var">self</span>.<span class="attr">note</span> = <span class="fn">float</span>(<span class="var">note</span>)
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<span class="kw">def</span> <span class="fn">__str__</span>(<span class="var">self</span>):
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<span class="kw">return</span> <span class="str">f"{self.name} (Note: {self.note:.1f})"</span>
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<span class="cm"># ==============================================================================</span>
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<span class="cm"># KLASSE 2: Die Schulklasse verwaltet viele Schüler-Objekte</span>
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<span class="cm"># ==============================================================================</span>
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<span class="kw">class</span> <span class="fn">Schulklasse</span>:
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<span class="kw">def</span> <span class="fn">__init__</span>(<span class="var">self</span>, <span class="var">klassen_name</span>):
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<span class="var">self</span>.<span class="attr">klassen_name</span> = <span class="var">klassen_name</span>
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<span class="var">self</span>.<span class="attr">schueler_liste</span> = []
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<span class="kw">def</span> <span class="fn">hinzufuegen</span>(<span class="var">self</span>, <span class="var">schueler</span>):
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<span class="var">self</span>.<span class="attr">schueler_liste</span>.<span class="fn">append</span>(<span class="var">schueler</span>)
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<span class="kw">def</span> <span class="fn">notendurchschnitt</span>(<span class="var">self</span>):
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<span class="kw">if</span> <span class="kw">not</span> <span class="var">self</span>.<span class="attr">schueler_liste</span>:
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<span class="kw">return</span> <span class="num">0.0</span>
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<span class="var">summe</span> = <span class="fn">sum</span>(<span class="var">s</span>.<span class="attr">note</span> <span class="kw">for</span> <span class="var">s</span> <span class="kw">in</span> <span class="var">self</span>.<span class="attr">schueler_liste</span>)
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<span class="kw">return</span> <span class="var">summe</span> / <span class="fn">len</span>(<span class="var">self</span>.<span class="attr">schueler_liste</span>)
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<span class="kw">def</span> <span class="fn">beste_schueler</span>(<span class="var">self</span>):
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<span class="cm"># Findet alle Schüler mit einer 1 (Note <= 1.5)</span>
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<span class="kw">return</span> [<span class="var">s</span> <span class="kw">for</span> <span class="var">s</span> <span class="kw">in</span> <span class="var">self</span>.<span class="attr">schueler_liste</span> <span class="kw">if</span> <span class="var">s</span>.<span class="attr">note</span> <= <span class="num">1.5</span>]
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<span class="cm"># Ausprobieren:</span>
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<span class="kw">if</span> <span class="var">__name__</span> == <span class="str">"__main__"</span>:
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<span class="var">klasse_9a</span> = <span class="fn">Schulklasse</span>(<span class="str">"Klasse 9a"</span>)
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<span class="var">s1</span> = <span class="fn">Schueler</span>(<span class="str">"Emma"</span>, <span class="num">1.0</span>)
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<span class="var">s2</span> = <span class="fn">Schueler</span>(<span class="str">"Lukas"</span>, <span class="num">2.3</span>)
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<span class="var">s3</span> = <span class="fn">Schueler</span>(<span class="str">"Mia"</span>, <span class="num">1.3</span>)
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<span class="var">klasse_9a</span>.<span class="fn">hinzufuegen</span>(<span class="var">s1</span>)
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<span class="var">klasse_9a</span>.<span class="fn">hinzufuegen</span>(<span class="var">s2</span>)
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<span class="var">klasse_9a</span>.<span class="fn">hinzufuegen</span>(<span class="var">s3</span>)
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<span class="fn">print</span>(<span class="str">f"Durchschnitt: {klasse_9a.notendurchschnitt():.2f}"</span>) <span class="cm"># 1.53</span>
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<span class="fn">print</span>(<span class="str">"\nBeste Schüler:"</span>)
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<span class="kw">for</span> <span class="var">einserschueler</span> <span class="kw">in</span> <span class="var">klasse_9a</span>.<span class="fn">beste_schueler</span>():
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<span class="fn">print</span>(<span class="str">f"- {einserschueler}"</span>)</pre>
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</div>
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</section>
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<!-- 3. Nützliche Kniffe -->
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<section class="card">
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<h2>3. Nützliche Kniffe für die Song-Aufgabe</h2>
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<h3>⏱️ Sekunden in "MM:SS" umrechnen</h3>
|
||
<div class="code-container">
|
||
<pre><span class="var">minuten</span> = <span class="var">self</span>.<span class="attr">dauer_sekunden</span> // <span class="num">60</span>
|
||
<span class="var">sekunden</span> = <span class="var">self</span>.<span class="attr">dauer_sekunden</span> % <span class="num">60</span>
|
||
<span class="kw">return</span> <span class="str">f"{minuten:02d}:{sekunden:02d}"</span> <span class="cm"># z.B. "03:35"</span></pre>
|
||
</div>
|
||
|
||
<h3>🔍 Groß- und Kleinschreibung beim Suchen ignorieren</h3>
|
||
<div class="code-container">
|
||
<pre><span class="kw">if</span> <span class="var">song</span>.<span class="attr">kuenstler</span>.<span class="fn">lower</span>() == <span class="var">kuenstler</span>.<span class="fn">lower</span>():
|
||
<span class="var">treffer</span>.<span class="fn">append</span>(<span class="var">song</span>)</pre>
|
||
</div>
|
||
</section>
|
||
|
||
<!-- 4. Aufgaben Card -->
|
||
<section class="card">
|
||
<h2>4. 🎯 Deine Aufgaben in <code><a href="aufgabe.py" style="color: inherit; text-decoration: underline;">aufgabe.py</a></code></h2>
|
||
|
||
<ul class="task-list">
|
||
<li class="task-item">
|
||
<input type="checkbox" class="task-checkbox" id="t5_1">
|
||
<label for="t5_1" class="task-label">
|
||
<strong>Klasse Song:</strong> <code>__init__(titel, kuenstler, dauer_sekunden)</code>, <code>formatierte_dauer()</code> ("MM:SS") und <code>__str__()</code>.
|
||
</label>
|
||
</li>
|
||
<li class="task-item">
|
||
<input type="checkbox" class="task-checkbox" id="t5_2">
|
||
<label for="t5_2" class="task-label">
|
||
<strong>Klasse Playlist:</strong> <code>__init__(name)</code> mit <code>self.songs = []</code>.
|
||
</label>
|
||
</li>
|
||
<li class="task-item">
|
||
<input type="checkbox" class="task-checkbox" id="t5_3">
|
||
<label for="t5_3" class="task-label">
|
||
<strong>Playlist Methoden:</strong> <code>song_hinzufuegen</code>, <code>anzahl_songs</code>, <code>gesamtdauer_sekunden</code>.
|
||
</label>
|
||
</li>
|
||
<li class="task-item">
|
||
<input type="checkbox" class="task-checkbox" id="t5_4">
|
||
<label for="t5_4" class="task-label">
|
||
<strong>Playlist Suchen:</strong> <code>finde_songs_von(kuenstler)</code> und <code>laengster_song()</code>.
|
||
</label>
|
||
</li>
|
||
</ul>
|
||
|
||
<h3>💡 Lösungshinweise (Aufklappen bei Bedarf)</h3>
|
||
|
||
<details>
|
||
<summary>🔍 Tipp zum längsten Song finden</summary>
|
||
<div class="details-content">
|
||
<div class="code-container">
|
||
<pre><span class="kw">def</span> <span class="fn">laengster_song</span>(<span class="var">self</span>):
|
||
<span class="kw">if</span> <span class="kw">not</span> <span class="var">self</span>.<span class="attr">songs</span>:
|
||
<span class="kw">return</span> <span class="kw">None</span>
|
||
|
||
<span class="var">bester_song</span> = <span class="var">self</span>.<span class="attr">songs</span>[<span class="num">0</span>]
|
||
<span class="kw">for</span> <span class="var">s</span> <span class="kw">in</span> <span class="var">self</span>.<span class="attr">songs</span>:
|
||
<span class="kw">if</span> <span class="var">s</span>.<span class="attr">dauer_sekunden</span> > <span class="var">bester_song</span>.<span class="attr">dauer_sekunden</span>:
|
||
<span class="var">bester_song</span> = <span class="var">s</span>
|
||
<span class="kw">return</span> <span class="var">bester_song</span></pre>
|
||
</div>
|
||
</div>
|
||
</details>
|
||
</section>
|
||
|
||
<!-- 5. Testen & Navigation -->
|
||
<section class="card">
|
||
<h2>5. 🧪 Lösung überprüfen</h2>
|
||
<p>Führe im Terminal im Ordner <code>05_objekte_kombinieren</code> folgenden Befehl aus:</p>
|
||
<div class="code-container">
|
||
<div class="code-header">
|
||
<span>Terminal</span>
|
||
</div>
|
||
<pre><code>python3 test_aufgabe.py</code></pre>
|
||
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|
||
|
||
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