title: Remove Row Index dataframe pandas
body: <p>Given a df</p>
  
  <pre><code>in[0]df1
  out[0]
          DATE    REVENUE    COST    POSITION
  FACTOR
  0    2017/01/01    1000    900    10
  1    2017/01/01    900     700    9
  2    2017/01/01    1100    800    7
  </code></pre>
  
  <p>I have an additional row <code>FACTOR</code>. After trying <code>reset_index()</code> and other ways, I cannot remove the <code>FACTOR</code> multi (row) index. Is there a way to do so?</p>
  
  <p>I know it's common to drop columns and reset index but not this way though.</p>