title: How to check if an element of a list is a list (in Python)?
body: <p>If we have the following list:</p>
  
  <pre><code>list = ['UMM', 'Uma', ['Ulaster','Ulter']]
  </code></pre>
  
  <p>If I need to find out if an element in the list is itself a list, what can I replace <em>aValidList</em> in the following code with?</p>
  
  <pre><code>for e in list:
      if e == aValidList:
          return True
  </code></pre>
  
  <p>Is there a special import to use?  Is there a best way of checking if a variable/element is a list?</p>