><span class="bp">self</span><span class="p">,</span> <span class="n">vertex</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="w">        </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Adds a vertex to the graph and assigns it the given coordinates.</span>

<span class="sd">        Parameters:</span>
<span class="sd">            vertex (str):</span>
<span class="sd">                The ve