urlpatterns = [
    ...
    url(r'^userinfo/', views.userinfo),
    url(r'^user_delete-(?P<nid>d+)/', views.user_delete),
]

def userinfo(request):

    if request.method == 'GET':

        # QuerySet
        user_list = models.UserInfo.objects.all()

        return render(request, 'app02/userinfo.html', {'user_list':user_list})
    elif request.method == 'POST':
        u = request.POST.get('username')
        p = request.POST.get('password')
        models.UserInfo.objects.create(
            username=u,
            password=p
        )
        print ('before redirect')
        return redirect('/app02/userinfo/')

def user_delete(request, nid):
    models.UserInfo.objects.filter(id=nid).delete()
    return redirect(request, '/app02/userinfo/')

<ul>
        {% for row in user_list  %}
        <li>
            <a href="/app02/user_detail-{{row.id}}/">{{ row.username }} </a> |
            <a href="/app02/user_delete-{{row.id}}/">delete</a>
        </li>
        {% endfor %}
    </ul>