title: Sorting the Columns based on value
body: <p>I had DataFrame with many of columns, I want to sort the the columns based on its total value, in other words the first columns will be with the highest value so </p>
  
  <pre><code>            A   B   C   D   E      F     G  L
  Date                                
  2010-01-01  0   10  0   0   950     0   40  0
  2010-03-01  0   0   0   0   1040    0   0   0
  2010-04-01  0   0   0   0   261     0   0   0
  2010-05-01  40  10  0   0   207     0   0   300
  2010-06-01  0   0   0   0   108     0   0   0
  2010-07-01  0   0   0   13  137     0   50  0
  2010-08-01  0   10  10  0   0       0   0   0
  2010-10-01  0   0   0   0   97      40  40  0
  </code></pre>