title: filling csv file from another csv file grouby column
body: <p>I have a csv file with 2 columns and I want to create another csv file and fill it like shown in <a href="https://i.stack.imgur.com/1NQYP.png" rel="nofollow noreferrer">the figure</a>. </p>
  
  <p>I tried:</p>
  
  <pre><code>xx = pd.read_csv('abc.csv', sep=';', encoding='latin-1')
  for row in xx:
      ss = []
      for p in row['id']:
          ss.append(row['description'])
  </code></pre>
  
  <p>but I don't see how to continue.</p>