Pagination Django with Boostrap

{% if num_pages %}
                <ul class="pagination">
                {% for num in num_pages %}
                    {% if num == list_itens.number %}
                        <li class="active"><a href="?page={{ num }}">{{ num }}</a></li>
                    {% else %}
                        <li><a href="?page={{ num }}">{{ num }}</a></li>
                    {% endif %}
                {% endfor  num_pages %}
                </ul>
            {% endif %}