span class="p">,</span> <span class="n">y</span> <span class="o">-</span> <span class="n">mean_y</span><span class="p">)</span> <span class="k">for</span> <span class="n">v</span><span class="p">,</span> <span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">coordinates</span><span class="o">.</span><span class="n">items</span><span class="p">()}</