pandas - Index column names -

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How do I get a list of column names in an index?

Example: 

  df1 = pd.DataFrame (np.arange (20). Reshape (4,5)), column = list ('abcde')) df1 = Df1.set_index (['a', 'b'], drop = fail) ABDAB 0 1 0 1 2 3 4 5 6 5 6 7 8 9 10 11 10 11 12 13 14 15 16 15 16 17 18 19 Code>  
 Is there a way to query df1 to get the index column: "['a', 'b']"?   
 
 
 This is really simple:  
  df1.index. Names

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