title: extract item from list of dictionaries
body: <p>Suppose you have a list of dictionaries like this one:</p>
  
  <pre><code>a = [ {'name':'pippo', 'age':'5'} , {'name':'pluto', 'age':'7'} ]
  </code></pre>
  
  <p>What do you to extract from this list only the dict where name==pluto?
  To make things a little bit harder, consider that I cannot do any import</p>