title: How to zip two 1d numpy array to 2d numpy array
body: <p>I have two numpy 1d arrays, e.g:</p>
  
  <pre><code>a = np.array([1,2,3,4,5])
  b = np.array([6,7,8,9,10])
  </code></pre>
  
  <p>Then how can I get one 2d array <code>[[1,6], [2,7], [3,8], [4,9], [5, 10]]</code>?</p>