title: in a dataframe, after you pivot a table but you want to stack values one below another?
body: <p>This is the output, but i want the values of zoo to come below baz and have another column showing baz/zoo.</p>
  
  <pre><code>df.pivot(index='foo', columns='bar', values=['baz', 'zoo'])
        baz       zoo
  bar   A  B  C   A  B  C
  foo
  one   1  2  3   x  y  z
  two   4  5  6   q  w  t
  </code></pre>