[Fixed]-Django : HTML Table with iterative lists values

You are iterating over a list within a list, yet you are trying to access indices of an item within a list within a list.

Remove the “secitem” loop and access indices of item OR simply iterate over the item.

{% for row in matrix %}
<tr>
    {% for value in row %}
        <td>{{ value }}</td>
    {% endfor %}
</tr>
{% endfor %}