How to convert upper case letters to lower case
<p>I have a script which reads the input and than lists it, however i want it to convert upper case letters to lower case, how can i do that?</p>

<p>this is what i got</p>

<pre><code> for words in text.readlines():
    sentence = [w.strip(',.') for w in line.split() if w.strip(',.')]
    list.append(sentence)
</code></pre>
