title: Accessing a specific sequence type within a numpy array
body: <p>I'm trying to access/filter for sets within a 2D numpy array.</p>
  <p>The array looks something like this</p>
  <pre><code>[[1,2,3,{1,2,3,4},]
  [{5,4,6,7},4,5,7]] 
  </code></pre>
  <p>I thought initially I'd be able to use <code>np.size</code> to filter for the sets (assuming sets have a size higher than <code>1</code>).</p>
  <p>However, the size of the sets returned <code>1</code>, the same as the individual elements within the array.</p>
  <p>I've also tried using <code>np.where.(array==set.....</code> but this did not filter for the sets either.</p>
  <p>Any help would be much appreciated.</p>