api_1-slash-urls.py

from django.conf.urls import patterns, url, include


from rest_framework.routers import DefaultRouter


from api_1 import views as api_1_views


router = DefaultRouter()
router.register('groups', service_views.GroupViewSet)


urlpatterns = patterns(
    '',
    url(r'^$', include(router.urls)),
)

urls.py

from django.conf.urls import patterns, url, include

from base import views as base_views


urlpatterns = patterns(
    '',
    url(r'^api/v1/$', base_views.APIRootView.as_view(), name='api-root'),
    url(r'^api/v1/api_1/', include('api_1.urls')),
    url(r'^api/v1/api_2/', include('api_2.urls')),
  )