from django.shortcuts import render

def about(request):
    return render(request, "about.html", {})

urlpatterns = patterns('',
    url(r'^about/$', 'trydjango18.views.about', name='about'),
)

        <div id="navbar" class="navbar-collapse collapse">
          <ul class="nav navbar-nav">
          <!--
              <li class="active"><a href="#">Home</a></li>
              <li><a href="/about">About</a></li>
              <li><a href="/contact">Contact</a></li>
          -->
            <li class="active"><a href="{% url 'home' %}">Home</a></li>
            <li><a href="{% url 'about' %}">About</a></li>
            <li><a href="{% url 'contact' %}">Contact</a></li>