title: pandas cross sectional indexing - select multiple columns
body: <p>How can I select <code>count</code> and <code>50%</code> when slicing the multi index in pandas?</p>
  
  <pre><code>import pandas as pd
  
  df = pd.DataFrame({
      'foo': [1,2,3], 'bar':[4,5,6], 'dt':['2020-01-01', '2020-01-01', '2020-01-02']
  })
  df.groupby(['dt']).describe().loc[:, (slice(None), '50%'), (slice(None), 'count')]
  </code></pre>
  
  <p>fails with:</p>
  
  <pre><code>IndexingError: Too many indexers
  </code></pre>