title: How to iterate over pandas DataFrameGroupBy and select all entries per grouped variable for specific column?
body: <p>Let's assume, there is a table like this:</p>
  
  <pre><code>Id | Type | Guid
  </code></pre>
  
  <p>I perform on such a table the following operation:</p>
  
  <pre><code>df = df.groupby('Id')
  </code></pre>
  
  <p>Now I would like to iterate through first <code>n</code> rows and for each specific <code>Id</code> as a <code>list</code> print all the corresponding entries from column <code>Guid</code>.
  Please, help me with a solution.</p>