title: Dictionary from columns' elements and indexe
body: <p>I have table like this:</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th>Column A</th>
  <th>Column B</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td>a</td>
  <td>[1, 2, 3]</td>
  </tr>
  <tr>
  <td>b</td>
  <td>[4, 1, 2]</td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>And I want to create dictionary like this using NumPy:</p>
  <p>{1: [a, b],</p>
  <p>2: [a, b],</p>
  <p>3: [a],</p>
  <p>4: [b]}</p>
  <p>is there a more or less simple way to do this?</p>