title: Select the inverse index in pd.Dataframe
body: <p>How to select the inverse index in pd.DataFrame by using <code>loc</code> or <code>iloc</code>?</p>
  
  <p>I tried <code>df.loc[!my_index,my_feature]</code> but fail. </p>
  
  <p>And <code>df.loc[[ind for ind in df.index.tolist() if ind not in my_index],my_feature]</code> looks too dull. Any better idea?</p>