title: KeyError while accessing multi index dataframe in Pandas
body: <p>I have the following dataframe having "Location" and "Name" as the index.</p>
  
  <pre><code>Location  Name   Cost   Item Purchased                
  Store 1   Chris  22.5   Dog Food
            Kevyn   2.5   Kitty Litter
  Store 2   Vinod   5.0   Bird Seed
  </code></pre>
  
  <p>I can access <code>df.loc["Store 1"]</code>
  But <code>df.loc["Store 1"]["Kevyn"]</code> is giving me KeyError. What am I doing wrong?</p>