 this declaration format. Spacing etc is not needed, just each parameter must be on a new line:</p>

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<div class=" highlight hl-ipython3"><pre><span></span><span class="k">def</span> <span class="nf">addition</span><span class="p">(</span>
    <span class="n">a</span><span class="p">:</span><span class="nb">int</span><span class="p">,</span