old_contents: from django.conf.urls import include, url
  from django.contrib import admin
  from rest_framework import routers
  
  from artists import views
  from users.views import UserViewSet
  
  router = routers.DefaultRouter()
  router.register(r'artists', views.ArtistViewSet)
  router.register(r'users', UserViewSet)
  router.register(r'similar', views.SimilarViewSet)
  
  user_router = routers.SimpleRouter()
  user_router.register(r'knownartists', views.KnownArtistViewSet)
  
  urlpatterns = [
      url(r'^', include(router.urls)),
      url(r'^users/me/', include(user_router.urls)),
      url(r'^api-auth/', include('rest_framework.urls',
                                 namespace='rest_framework')),
      url(r'^api-token-auth/',
          'rest_framework.authtoken.views.obtain_auth_token'),
      url(r'^admin/', include(admin.site.urls)),
  ]
  
new_contents: from django.conf.urls import include, url
  from django.contrib import admin
  from rest_framework import routers
  
  from artists import views
  from users.views import UserViewSet
  
  router = routers.DefaultRouter()
  router.register(r'artists', views.ArtistViewSet)
  router.register(r'users', UserViewSet)
  router.register(r'similar', views.SimilarViewSet)
  
  user_router = routers.SimpleRouter()
  user_router.register(r'known-artists', views.KnownArtistViewSet)
  
  urlpatterns = [
      url(r'^', include(router.urls)),
      url(r'^users/me/', include(user_router.urls)),
      url(r'^api-auth/', include('rest_framework.urls',
                                 namespace='rest_framework')),
      url(r'^api-token-auth/',
          'rest_framework.authtoken.views.obtain_auth_token'),
      url(r'^admin/', include(admin.site.urls)),
  ]
  
subject: Make url pretty