title: Delete all rows above a specifc row Pandas dataframe
body: <p>This is a sample of the data that I have.</p>
  
  <pre><code>    Label | Time
      start | 1.42
      A     | 1.42
      error | 2.21
      C     | 2.24
      C     | 2.24
      error | 2.30
      A     | 2.50
      B     | 2.60
  </code></pre>
  
  <p>Is there anyway I can delete all the rows above the row which has the Label 'error ' including the 'error' row itself (there could be multiple rows with Label 'T') ?<br>
  or rather delete all the rows between 'start' and 'error' ?</p>
  
  <p>so that the final output would be</p>
  
  <pre><code>    Label | Time
      start | 1.42
      A     | 2.50
      B     | 2.60
  </code></pre>