title: Check if a sublist contains an item
body: <p>I have a list of lists in Python. As illustrated below, I want to check if one of the sublists contains an item. The following attempt fails. Does anyone know of a simple way -- without me writing my own for loop?</p>
  
  <pre><code>&gt;&gt;&gt; a = [[1,2],[3,4],[5,6],7,8,9]
  &gt;&gt;&gt; 2 in a
  </code></pre>
  
  <p>I was hoping for <code>True</code> but the return was <code>False</code></p>