title: Python - combining two arrays
body: <p>I have two arrays:</p>
  
  <pre><code>a = [[11, 12], [21, 22]]
  b = [[101, 102], [201, 202]]
  </code></pre>
  
  <p>my desire result after combining is:</p>
  
  <pre><code>[[[11,21], [12,22]],[[101, 201],[102,202]]]
  </code></pre>
  
  <p>is it a possible way to do the above in a simple way without using <code>for</code> or other type of looping? Thanks</p>