Pandas reset inner level of MultiIndex : <p>I have a DF in the following format:</p>

<pre><code>                   col1    col2
ID          Date
 1    1993-12-31      4       6
      1994-12-31      8       5
      1995-12-31      4       7
      1996-12-31      3       3
 2    2000-12-31      7       8
      2001-12-31      5       9
      2002-12-31      8       4
</code></pre>

<p>And I want to reset the 'Date' index giving the following:</p>

<pre><code>             col1    col2
ID    Date
 1       0      4       6
         1      8       5
         2      4       7
         3      3       3
 2       0      7       8
         1      5       9
         2      8       4
</code></pre>

<p>I thought simply <code>df.reset_index(level='Date', inplace=True, drop=True)</code> would do it, but it does not.</p>
