[web2py] for i,row in enumerate(rows) second condition

[Annet]

I've got the following code in a view:

<tbody>
  {{for i,row in enumerate(rows):}}
  {{if (i + 1) % 3 == 1:}}
     <tr><td>
      <div class="row">
        <div class="col-md-4">
          {{include 'default/thumbnail.html'}}
        </div> <!-- /.col-md-4 -->
  {{elif (i + 1) % 3 == 2:}}
        <div class="col-md-4">
          {{include 'default/thumbnail.html'}}
        </div> <!-- /.col-md-4 -->
  {{elif (i + 1) % 3 == 0:}}
        <div class="col-md-4">
          {{include 'default/thumbnail.html'}}
        </div> <!-- /.col-md-4 -->
      </div> <!-- /.row -->
   </td></tr>
  {{pass}}
  {{pass}}
  {{if not (i + 1) % 3 == 0:}}
    </div> <!-- /.row -->
  </td></tr>
  {{pass}}
 </tbody>

This code comes from a pre bootstrap app, I only made adjustments to style 
it the bootstrap way.

What I want is a table with <tr><td> containing a bootstrap grid containing:

<div class="row">
  <div class="col-xs-12 col-sm-6 col-md-3">
    {{include 'default/thumbnail.html'}}
   </div> <!-- /.col-xs-12 col-sm-6 col-md-3 -->
</div> <!-- /.row -->

rows contains between 60 and 80 records of which I want to display 12 per 
<tr><td>

I tried a nested for loop but I do not get it to work properly, I hope one 
of you
can point me in the right direction.

Regards,

Annet

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