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<!DOCTYPE html>
<!--
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<span class="topbar__title">Informatik · Python · Klasse 9</span>
<span class="save-status"><span class="save-dot" id="save-dot"></span><span id="save-label">Gespeichert</span></span>
<button class="tb-btn tb-btn--reset" data-action="reset">↺ Reset</button>
</header>
<article class="page">
<header class="page-header">
<span class="ue-label">Informatik · Klasse 9 · Python — Funktionen</span>
<h1>Funktionen verstehen und selbst schreiben</h1>
</header>
<div class="content">
<div class="box">
<span class="box-title">ℹ️ Heute</span>
<p>Du lernst, wie Python-Funktionen aufgebaut sind, liest fremden Code und schreibst eigene Funktionen. Teste deinen Code im <a href="https://pythonsandbox.com" target="_blank" rel="noopener">pythonsandbox.com</a>.</p>
</div>
<h2>Lesen — was macht dieser Code?</h2>
<article class="aufgabe" data-task-id="l1">
<header class="aufgabe__header"><span class="aufgabe__nr">1</span><h3 class="aufgabe__titel">Vorhersage: Was wird ausgegeben?</h3></header>
<div class="aufgabe__body">
<pre class="code-box"><span class="kw">def</span> <span class="fn">begruessung</span>(name):
<span class="kw">return</span> <span class="st">"Hallo, "</span> + name + <span class="st">"!"</span>
<span class="kw">print</span>(<span class="fn">begruessung</span>(<span class="st">"Mira"</span>))</pre>
<div class="field">
<label for="l1-a">Deine Vorhersage</label>
<input type="text" id="l1-a" data-state="l1-a"
data-expected-keywords="Hallo, Mira!,Hallo Mira!" autocomplete="off"
placeholder='z. B. "..."'>
<span class="feedback" data-feedback-for="l1-a"></span>
</div>
<a class="sandbox-link" href="https://pythonsandbox.com" target="_blank" rel="noopener">↗ Im Python-Sandbox prüfen</a>
</div>
</article>
<article class="aufgabe" data-task-id="l2">
<header class="aufgabe__header"><span class="aufgabe__nr">2</span><h3 class="aufgabe__titel">Was berechnet diese Funktion?</h3></header>
<div class="aufgabe__body">
<pre class="code-box"><span class="kw">def</span> <span class="fn">verdoppeln</span>(zahl):
<span class="kw">return</span> zahl * <span class="nm">2</span>
<span class="cm"># Tests:</span>
<span class="kw">print</span>(<span class="fn">verdoppeln</span>(<span class="nm">5</span>))
<span class="kw">print</span>(<span class="fn">verdoppeln</span>(<span class="nm">12</span>))</pre>
<div class="field">
<label for="l2-a">Was wird ausgegeben?</label>
<input type="text" id="l2-a" data-state="l2-a"
data-expected-keywords="10,24" autocomplete="off"
placeholder='zwei Zahlen, durch Zeilenumbruch / Komma'>
<span class="feedback" data-feedback-for="l2-a"></span>
</div>
</div>
</article>
<h2>Schreiben — jetzt du</h2>
<article class="aufgabe" data-task-id="s1">
<header class="aufgabe__header"><span class="aufgabe__nr">3</span><h3 class="aufgabe__titel">Schreibe eine Funktion <code>quadrat(zahl)</code></h3></header>
<div class="aufgabe__body">
<p>Die Funktion soll die Quadratzahl zurückgeben. Also: <code>quadrat(5)</code> → <code>25</code>.</p>
<textarea class="code-answer" data-state="s1-code"
spellcheck="false" autocapitalize="off"
placeholder="def quadrat(zahl): "></textarea>
<a class="sandbox-link" href="https://pythonsandbox.com" target="_blank" rel="noopener">↗ Testen</a>
<br>
<button class="reveal-btn" data-action="solution" data-task-id="s1">🔍 Beispiel-Lösung</button>
<div class="solution-content" data-task-id="s1" hidden>
<p><strong>Eine mögliche Lösung:</strong></p>
<pre class="code-box"><span class="kw">def</span> <span class="fn">quadrat</span>(zahl):
<span class="kw">return</span> zahl * zahl</pre>
<p class="hint" style="color:var(--fg-muted);font-size:var(--fs-sm)">
Andere Wege sind möglich: <code>zahl ** 2</code> oder <code>pow(zahl, 2)</code>.
</p>
</div>
</div>
</article>
<article class="aufgabe" data-task-id="s2">
<header class="aufgabe__header"><span class="aufgabe__nr">4</span><h3 class="aufgabe__titel">Schreibe eine Funktion <code>ist_gerade(n)</code></h3></header>
<div class="aufgabe__body">
<p>Die Funktion soll <code>True</code> zurückgeben, wenn <code>n</code> gerade ist, sonst <code>False</code>. Tipp: Modulo-Operator <code>%</code>.</p>
<textarea class="code-answer" data-state="s2-code"
spellcheck="false" autocapitalize="off"
placeholder="def ist_gerade(n): "></textarea>
<a class="sandbox-link" href="https://pythonsandbox.com" target="_blank" rel="noopener">↗ Testen</a>
<br>
<button class="reveal-btn" data-action="solution" data-task-id="s2">🔍 Beispiel-Lösung</button>
<div class="solution-content" data-task-id="s2" hidden>
<pre class="code-box"><span class="kw">def</span> <span class="fn">ist_gerade</span>(n):
<span class="kw">return</span> n % <span class="nm">2</span> == <span class="nm">0</span></pre>
<p class="hint" style="color:var(--fg-muted);font-size:var(--fs-sm)">
<code>n % 2</code> gibt den Rest beim Teilen durch 2. Ist der Rest 0, ist die Zahl gerade.
</p>
</div>
</div>
</article>
<article class="aufgabe" data-task-id="s3">
<header class="aufgabe__header"><span class="aufgabe__nr">★ 5</span><h3 class="aufgabe__titel">Bonus: Funktion <code>maximum(a, b, c)</code></h3></header>
<div class="aufgabe__body">
<p>Die Funktion soll die größte der drei Zahlen zurückgeben — <strong>ohne <code>max()</code> zu benutzen</strong>.</p>
<textarea class="code-answer" data-state="s3-code"
spellcheck="false" autocapitalize="off"
placeholder="def maximum(a, b, c): "></textarea>
<a class="sandbox-link" href="https://pythonsandbox.com" target="_blank" rel="noopener">↗ Testen</a>
<br>
<button class="reveal-btn" data-action="solution" data-task-id="s3">🔍 Beispiel-Lösung</button>
<div class="solution-content" data-task-id="s3" hidden>
<pre class="code-box"><span class="kw">def</span> <span class="fn">maximum</span>(a, b, c):
<span class="kw">if</span> a >= b <span class="kw">and</span> a >= c:
<span class="kw">return</span> a
<span class="kw">elif</span> b >= c:
<span class="kw">return</span> b
<span class="kw">else</span>:
<span class="kw">return</span> c</pre>
<p class="hint" style="color:var(--fg-muted);font-size:var(--fs-sm)">Eleganter geht's auch:</p>
<pre class="code-box"><span class="kw">def</span> <span class="fn">maximum</span>(a, b, c):
m = a
<span class="kw">if</span> b > m: m = b
<span class="kw">if</span> c > m: m = c
<span class="kw">return</span> m</pre>
</div>
</div>
</article>
</div>
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