[web2py] interval in a list

[Rick]

Hi,

In the database there are value records for 31 days. Now I'm trying to
make a html file where a value is presented for each day of a week.
The code below presents all the recorded values, and I don't know how
to make it printing the 7 first records only, or the last 3 records.

Thanks in advance for help.

<table>
        <tr>
                <td>Day| <br> Value| </td>
                {{for record in records:}}
                <td>{{=record.day}} <br> {{=record.value}}</td>
                {{pass}}
        </tr>
</table>