title: Why reindex instead of using .loc?
body: <p>In previous versions of pandas, using <code>.loc[list-of-values]</code> would work, so as long as the list of values contained at least one existing key.  </p>
  
  <p>However, pandas has swapped out this functionality in favor for the reindex function.  I personally liked the <code>.loc</code> feature since it worked well with index slicing and other <code>.loc</code> behaviors. Was wondering why they decided to do this?</p>