my tango/urls.py
from django.conf.urls import patterns, include, url
from django.contrib import admin
urlpatterns = patterns('',
# Examples:
# url(r'^$', 'tango.views.home', name='home'),
# url(r'^blog/', include('blog.urls')),
url(r'^admin/', include(admin.site.urls)),
(r'^rango/$', include('rango.urls')),
(r'^$', 'tango.views.index'),
)