擅长:python、mysql、java
<p><code>d['children']</code>是一个<code>list of dict</code>,如您在<code>d1</code>dict中所见</p>
<p>现在,当你在你的<code>children</code>上迭代时,在<code>NodeTree</code>中,本质上只有<code>d['children']</code>,你将得到{<cd7>}作为每个元素:</p>
<pre><code>for c in self.children: // c is a `dict` type here
count += c.count() // there is not attribute as `count` for a `dict`.
</code></pre>
<p>所以你得到了那个错误。在</p>