How to convert elements in a list of list to lowercase?
<p>I am trying to convert the elements of a list of list of lowercase. This is what is looks like.</p>

<pre><code>print(dataset)
[['It', 'went', 'Through', 'my', 'shirt', 'And', 'came', 'out', 'The', 'back', 'and', 'hit', 'the', 'kid', 'behind', 'me', 'in', 'the', 'toe']]
</code></pre>

<p>I have tried doing this:</p>

<pre><code>for line in dataset:
    rt=[w.lower() for w in line]
</code></pre>

<p>However this gives me an error saying list object has no attribute lower(). </p>