None</span><span class="p">:</span>
            <span class="n">full_map</span> <span class="o">=</span> <span class="n">map_df</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="n">full_map</span> <span class="o">=</span> <span class="n">full_map</span><span class="o">.</span><span class="n">merge</span><span class="p">(</span>
                <span class="n">map_df</span><span class="p">,</span> <span class="n">on</span><span class="o">=</span><span class="p">(</sp