I have to take the count of number of item in my invoice_line in my invoice

    <section>
        <para>[[repeatIn(o.move_lines,'line')]]</para>--------------->here I am creating the object
    <blockTable>
      <tr>
        <td>
          <para style="terp_tblheader_General_Centre1">[[ reduce(lambda x, obj: x+obj.line , list , 0 ) ]] </para>-------------------->expression to return the number of line in my invoice
        </td><t/r></blocktable></section>

so my desired output should be like this

  |  location  |          code     |        product     |     qty

       House1              10                   ipad                 1   

       House2              25                   iphone              2  

                                                          ----------------------------

                                                         total                    3 ------------------------>For this how to use lambda function..In RML report