Django pagination with bootstrap classes

.html

<ul class="pagination">
    {% if page.has_previous %}
        <li><a href="?page={{ page.previous_page_number }}"><span>&laquo;</span></a></li>
    {% else %}
        <li class="disabled"><span>&laquo;</span></li>
    {% endif %}
    {% for i in paginator.page_range %}
        {% if page.number == i %}
        <li class="active"><span>{{ i }} <span class="sr-only">(current)</span></span></li>
        {% else %}
        <li><a href="?page={{ i }}">{{ i }}</a></li>
        {% endif %}
    {% endfor %}
    {% if page.has_next %}
        <li><a href="?page={{ page_obj.next_page_number }}">&raquo;</a></li>
    {% else %}
        <li class="disabled"><span>&raquo;</span></li>
    {% endif %}
</ul>