title: Check if object is list of list in python?
body: <p>Is there any ways we  can detect if an object is list in python using <code>type(obj)</code> --> <code>list</code>.</p>
  
  <p>But how can we detect if the object is list of list of the form as:</p>
  
  <pre><code>[['a','b']['a','b'][][]]
  </code></pre>