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Beginners course PyLadies Vienna: Or &amp; and

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<h1><em>Or</em> &amp; <em>and</em></h1>
<p>In addition to the operators that we saw in the Comparison lesson, we will now add 3 more logical (Boolean) operators to the table:</p>
<table class="table">
<tr>
<th>Symbol</th>
<th>Example</th>
<th>Description</th>
</tr>
<tr>
<td><code>and</code></td>
<td><code>x and y</code></td>
<td>True if both operands are true</td>
</tr>
<tr>
<td><code>or</code></td>
<td><code>x or y</code></td>
<td>True if either operand is true</td>
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<tr>
<td><code>not</code></td>
<td><code>not x</code></td>
<td>True if the operand is false<br>
(it negates the operand)</td>
</tr>
</table><div class="highlight"><pre><span></span><span class="c1"># This program gives naive life advice.</span>

<span class="nb">print</span><span class="p">(</span><span class="s1">'Answer "yes" or "no".'</span><span class="p">)</span>
<span class="n">happy_status</span> <span class="o">=</span> <span class="nb">input</span><span class="p">(</span><span class="s1">'Are you happy?'</span><span class="p">)</span>
<span class="k">if</span> <span class="n">happy_status</span> <span class="o">==</span> <span class="s1">'yes'</span><span class="p">:</span>
<span class="n">happy</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">elif</span> <span class="n">happy_status</span> <span class="o">==</span> <span class="s1">'no'</span><span class="p">:</span>
<span class="n">happy</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">else</span><span class="p">:</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">'I do not understand!'</span><span class="p">)</span>

<span class="n">rich_status</span> <span class="o">=</span> <span class="nb">input</span><span class="p">(</span><span class="s1">'Are you rich?'</span><span class="p">)</span>
<span class="k">if</span> <span class="n">rich_status</span> <span class="o">==</span> <span class="s1">'yes'</span><span class="p">:</span>
<span class="n">rich</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">elif</span> <span class="n">rich_status</span> <span class="o">==</span> <span class="s1">'no'</span><span class="p">:</span>
<span class="n">rich</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">else</span><span class="p">:</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">'I do not understand!'</span><span class="p">)</span>

<span class="k">if</span> <span class="n">rich</span> <span class="ow">and</span> <span class="n">happy</span><span class="p">:</span>
<span class="c1"># rich and at the same time.</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">'Congratulations!'</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">rich</span><span class="p">:</span>
<span class="c1"># rich but not "rich and happy",</span>
<span class="c1">#so must be only rich.</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">'Try to smile more.'</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">happy</span><span class="p">:</span>
<span class="c1"># must be only happy.</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">'Try to spend less.'</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># neither happy nor rich.</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"I'm sorry for you."</span><span class="p">)</span>
</pre></div><div class="admonition note"><p>What happens if you answer something other than "Yes" or "No"?</p>
<p>The variables <code>happy</code> and <code>rich</code> won't be set, and later when they are needed, the program will end with an error.</p>
<p>We will learn how to handle errors <a href="/2024/pyladies-en-vienna-2024-spring/beginners-en/exceptions/">next time</a>.</p>
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<a href="/2024/pyladies-en-vienna-2024-spring/beginners-en/comparisons/">← <span class="d-none d-sm-inline">Comparison</span></a>
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<a href="/2024/pyladies-en-vienna-2024-spring/sessions/loops/">↑ <span class="d-none d-sm-inline">Lesson: Conditions, modules and functions</span></a>
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<p>Translated by Alexandru Dumitru</p>

<p>Originally written by Petr Viktorin, 2014-2017 for <a href="https://naucse.python.cz/course/pyladies/beginners/and-or/">PyLadies CZ</a>.</p>



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<div class="col text-right">
<a href="/2024/pyladies-en-vienna-2024-spring/sessions/loops/back/"><span class="d-none d-sm-inline">End of lesson</span> →</a>
<a href="/2024/pyladies-en-vienna-2024-spring/beginners-en/and-or/"><span class="d-none d-sm-inline">Or &amp; and</span> →</a>
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<div class="col text-right">
<a href="/2024/pyladies-en-vienna-2024-spring/sessions/loops/back/"><span class="d-none d-sm-inline">End of lesson</span> →</a>
<a href="/2024/pyladies-en-vienna-2024-spring/beginners-en/and-or/"><span class="d-none d-sm-inline">Or &amp; and</span> →</a>
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<div class="col text-right">
<a href="/2024/pyladies-en-vienna-2024-spring/sessions/loops/back/"><span class="d-none d-sm-inline">End of lesson</span> →</a>
<a href="/2024/pyladies-en-vienna-2024-spring/beginners-en/and-or/"><span class="d-none d-sm-inline">Or &amp; and</span> →</a>
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