擅长:python、mysql、java
<p>尝试:</p>
<pre><code>print([x for i in foldersinlist for x in i])
</code></pre>
<p>输出:</p>
<pre><code>['Training', 'Training videos', 'Training documents', 'Training workouts', 'Training practicals', 'Training practicals', 'Training practicals']
</code></pre>