title: python matplotlib plot table with multiple headers
body: <p>I can plot my single-header dataframe on a figure with this code:</p>
  
  <pre><code>plt.table(cellText=df.round(4).values, cellLoc='center', bbox=[0.225, 1, 0.7, 0.15],
      rowLabels=['  {}  '.format(i) for i in df.index], rowLoc='center',
      rowColours=['silver']*len(df.index), colLabels=df.columns, colLoc='center',
      colColours=['lightgrey']*len(df.columns), colWidths=[0.1]*len(df.columns))
  </code></pre>
  
  <p>My question is: is it possible to <strong>plot a dataframe with multiindex columns</strong>? I want two separate "rows" for my multi-headers, so tuples in one header row is not good. If it is possible I want apply the above styles (colors) on both headers (it would be brilliant to set different colors for the multi headers).</p>
  
  <p>Here is an example dataframe:</p>
  
  <pre><code>df = pd.DataFrame([[11, 22], [13, 23]],
      columns=pd.MultiIndex.from_tuples([('main', 'sub_1'), ('main', 'sub_2')]))
  </code></pre>
  
  <p>Result:</p>
  
  <pre><code>             main
      sub_1   sub_2
  0      11      22
  1      13      23
  </code></pre>