python: append only specific elements from a list
<p>i have a list of a list:</p>

<pre><code>b=[[1,2,3],[4,5,6],[7,8,9]]
</code></pre>

<p>i have a list:</p>

<pre><code>row = [1,2,3]
</code></pre>

<p>how do i append to <code>b</code> only <code>row[0]</code> and <code>'3847'</code> and <code>row[2]</code> such that <code>b</code> will equal:</p>

<pre><code>b=[[1,2,3],[4,5,6],[7,8,9],[1,3847,3]]
</code></pre>
