Sum one column of a list(follow up)
<p>I have a list that that looks like this:</p>

<pre><code>('string ', 'time', 'SPY', 0, 0, 131.63, 100),
('sting ', 'time', 'SPY', 0, 0, 131.63, 700)
</code></pre>

<p>what I want to do is add the last column of data</p>

<p>What I though to do is unzip the list and then sum the absolute value of the date in the last column but I cant get it to work correctly</p>

<p>what I have been trying is this:</p>

<pre><code>testsum = sum(abs(zip(*list[:-1]))
</code></pre>

<p>thanks</p>

<p>EDIT:
Ok so thanks for the response</p>

<pre><code>sum(l[-1]) for l in list
</code></pre>

<p>worked well but I forgot to mention that I have it running in a for loop and what I really want to do is add all the sums that are outputted I'm really confused and am unsure how to do that I though I could do the same thing again but it didnt work</p>
