title: Extracting first value of pair type in python
body: <p>If i am getting data in the following format:</p>
  
  <pre><code>[(1, 2), (3, 8)]
  </code></pre>
  
  <p>I understand that this is basically a list of pair tuples, I basically was thinking what is the most effective way of getting the first value of each tuple. So for the above case I would want to get value <code>[1,3]</code></p>