title: Making smallest entry of each column bold
body: <p>I've just finished running some code and combined it into the following table:</p>
  <pre><code># Write to DataFrame
  
  Results_test = pd.DataFrame({'MAE': Results_MAE_test,
                          'MinE': Results_MinE_test, 
                          'MaxE': Results_MaxE_test,
                          'MSE':Results_MSE_test},
                          index={'OLS','DeepNN'})
  </code></pre>
  <p>How can I write a function which returns the same table but with the smallest value of each column made bold?  (any the largest made italic)?</p>