https://dailypytips.com/tags/functions/Recent content in Functions on DailyPyTipsHugo -- 0.160.1en-usTue, 28 Apr 2026 00:00:00 +0000https://dailypytips.com/posts/day5/Tue, 28 Apr 2026 00:00:00 +0000https://dailypytips.com/posts/day5/<blockquote> <p>You think calling a function is cheap. It isn’t.</p> </blockquote> <p>Every function call has a cost.</p> <p>Today, you understand what actually happens when Python executes functions.</p> <hr> <h2 id="todays-goal">Today’s Goal</h2> <p>By the end of today, you will:</p> <ul> <li>Understand how function calls work internally</li> <li>Learn what a call stack is</li> <li>Visualize execution flow</li> <li>Understand performance impact of function calls</li> </ul> <hr> <h2 id="the-illusion">The Illusion</h2> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-python" data-lang="python"><span class="line"><span class="cl"><span class="k">def</span> <span class="nf">add</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">):</span> </span></span><span class="line"><span class="cl"> <span class="k">return</span> <span class="n">a</span> <span class="o">+</span> <span class="n">b</span> </span></span><span class="line"><span class="cl"> </span></span><span class="line"><span class="cl"><span class="n">add</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span> </span></span></code></pre></div><p>You think:</p> <blockquote> <p>Python just jumps into the function</p> </blockquote> <p>Reality:</p>