Django pagination with bootstrap snippet

gistfile1.txt

{% for n in posts.paginator.page_range %}

    {% if posts.number == n %}
        <li class="page-item active">
            <span class="page-link">{{ n }}<span class="sr-only">(current)</span></span>
        </li>
    {% elif n > posts.number|add:'-2' and n < posts.number|add:'2' %}
        <li class="page-item"><a class="page-link" href="?page={{ n }}">{{ n }}</a></li>
    {% endif %}

{% endfor %}