url(r'^entry/tags/(?P<id>\d+)S',  views.marker_view),

def marker_view(request, id):
                                        # marker = get_object_or_404(Tag, pk=id)
                                         #marker = Tag.objects.filter(pk=id)
       marker = Tag.objects.select_related().get(id=id)
       topics = marker.entry_set.all()
       return render(request, 'taggs.html', {'topics': topics})

 {% extends "base.html" %}
{% load django_markdown %}
{% block blog_tag %}
{% for object in topics %}
  <div class="post">
    <h2><a href="{% url "entry_detail" slug=object.slug %}">{{ object.title }}</a></h2>
    <p class="meta">
      {{ object.created }} 
    </p>
    {{ object.body|markdown }}  </div>
 {% endfor %}
{% endblock %}

{% block blog_tag %}
{% for tag in tag_list %}
  <div class="tag">
    <h4> <a href = "/entry/tags/{{tag.id}}">{{tag}}</a></h4>
  </div>
{% endfor %}
{% endblock %}

url(r'^entry/tags/(?P<id>\d+)S'

<a href = "/entry/tags/{{tag.id}}">

{% url %}

url(r'^entry/tags/(?P<pk>\d+)/$',  views.marker_view, name = 'marker')

<h4> <a href = "{% url "marker"  pk=tag.id %}">{{tag}}</a></h4>

def marker_view(request, pk):
    # marker = get_object_or_404(Tag, pk=tag_id)
    #marker = Tag.objects.filter(pk=id)
    a = int(pk)
    marker = Tag.objects.select_related().get(id= a)
    topics = marker.entry_set.all()
    return render(request, 'taggs.html', {'topics': topics})