title: How to extract all the column name from the required table by Excel(or maybe python)
body: <p>Now I have table1 as below:</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th>A</th>
  <th>B</th>
  <th>C</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td>First</td>
  <td>Second</td>
  <td>Second</td>
  </tr>
  <tr>
  <td>Second</td>
  <td>Third</td>
  <td>Forth</td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>I now want to output a list(The first column has already known):</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th>First</th>
  <th>A</th>
  <th></th>
  <th></th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td>Second</td>
  <td>A</td>
  <td>B</td>
  <td>C</td>
  </tr>
  <tr>
  <td>Thrid</td>
  <td>B</td>
  <td></td>
  <td></td>
  </tr>
  <tr>
  <td>Forth</td>
  <td>C</td>
  <td></td>
  <td></td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>How can I output this using Excel(or maybe python, if much easier)?</p>