title: Create a dynamic 2D numpy array on the fly
body: <p>I am having a hard time creating a <code>numpy</code> 2D array on the fly.</p>
  
  <p>So basically I have a for loop something like this.</p>
  
  <pre><code>for ele in huge_list_of_lists:
     instance = np.array(ele) 
  </code></pre>
  
  <p>creates a 1D numpy array of this list and now I want to append it to a numpy array so basically converting list of lists to array of arrays? </p>
  
  <p>I have checked the manual.. and <code>np.append()</code> methods that doesn't work as for <code>np.append()</code> to work, it needs two arguments to append it together.</p>
  
  <p>Any clues?</p>