title: how to read row by row in a dataframe using a loop and return each value or pop out each value
body: <p>How can I read row by row in a <code>Dataframe</code> using a loop and return each value or pop out each value?</p>
  
  <p><strong>Example:</strong></p>
  
  <pre><code>id    name
  
  1     abc
  2     vbs
  2     askj
  </code></pre>