title: Divide list or dataframe after certain value
body: <p>I have a list that looks like this:</p>
  <pre><code>list = ['A', '0', '1', '2', 'B', '3', '5', '6']
  </code></pre>
  <p>I would like to create either DataFrames or lists that go such as:</p>
  <pre><code>A = ['0, 1 ,2']
      
  B = ['3', '5', '6']
  </code></pre>
  <p>Basically assigning the values between letter and letter to a separate list.</p>
  <p>I have tried several methods but can't seem to make it work.</p>