title: search list for exact match
body: <p>How can I search list(s) where all the elements <strong>exactly</strong> match what I'm looking for. For instance, I want to verify if the following list consist of 'a', 'b' and 'c', and nothing more or less.</p>
  
  <pre><code>lst=['a', 'b', 'c']
  </code></pre>
  
  <p>I did this:</p>
  
  <pre><code>if 'a' in lst and 'b' in lst and 'c' in lst:
     #do something
  </code></pre>
  
  <p>Many thanks in advance.</p>