uot;user_fn&quot;) is None:</span>
    <span class="c1">#             text.append(&quot;    User fn: (cumulative)&quot;)</span>
    <span class="c1">#         else:</span>
    <span class="c1">#             text.append(&quot;    User fn: (User fn)&quot;)</span>
    <span class="c1">#         text.append(&quot;&quot;)</span>
    <span class="c1">#         return text</span>

    <span class="c1">#     text = []</span>
    <span class="c1">#     for i_node, (name, node) in enumerate(self.data.items()):</span>