python2: merge a list of csv elements
<p>I have a dict like this:</p>

<pre><code>{1: ['1,2,3', '4,5,6', '7,8']}
</code></pre>

<p>the dict can be variable in the number of list items but always 1 dict item. How do I merge it to</p>

<p>{1: ['1,2,3,4,5,6,7,8']}</p>

<p>?</p>

<p>Thanks</p>
