Merge corresponding elements of 2 lists in python : <p>List 1:</p>

<pre><code>['buying','maint']
</code></pre>

<p>List 2:</p>

<pre><code>[['med', 'vhigh', 'low', 'high'],['med', 'small', 'big']]
</code></pre>

<p>Expected_output:</p>

<pre><code>[['buying_med', 'buying_vhigh','buying_low','buying_high'],['maint_med','maint_small','maint_big']]
</code></pre>

<p>Please let mw know on how to do this in python 3.</p>
