title: increment a variable in django templates
body: <p>All,</p>
  
  <p>How Can we increment a  value  like the following  in django templates,     </p>
  
  <pre><code>  {{ flag =0 }}
  
    {% for op in options %}
     {{op.choices}}&lt;input type="radio" name="template" id="template" value="template{{flag++}}"/&gt;
    {% endfor %}
  </code></pre>
  
  <p>thanks..</p>