old_contents: import re
  
  from django.conf.urls import patterns, include, url
  
  from . import views
  
  urls = []
  for attr in dir(views):
      View = getattr(views, attr)
      try:
          is_demo = issubclass(View, views.DemoMixin) and View is not views.DemoMixin
      except TypeError:
          continue
      if is_demo:
          name = re.sub(r'([a-z]|[A-Z]+)(?=[A-Z])', r'\1-', attr).lower()
          name = name.replace("-datatable-view", "")
          urls.append(url(r'^{name}/$'.format(name=name), View.as_view(), name=name))
  
  urlpatterns = patterns('',
      url(r'^$', views.IndexView.as_view(), name="index"),
      url(r'^reset/$', views.ResetView.as_view()),
      url(r'^migration-guide/$', views.MigrationGuideView.as_view(), name="migration-guide"),
      url(r'^column-formats/$', views.ValidColumnFormatsView.as_view(), name="column-formats"),
      url(r'^javascript-initialization/$', views.JavascriptInitializationView.as_view(), name="js-init"),
      url(r'^satellite/$', views.SatelliteDatatableView.as_view(), name="satellite"),
      *urls
  )
  
new_contents: import re
  
  from django.conf.urls import patterns, url
  
  from . import views
  
  urls = []
  for attr in dir(views):
      View = getattr(views, attr)
      try:
          is_demo = issubclass(View, views.DemoMixin) and View is not views.DemoMixin
      except TypeError:
          continue
      if is_demo:
          name = re.sub(r'([a-z]|[A-Z]+)(?=[A-Z])', r'\1-', attr).lower()
          name = name.replace("-datatable-view", "")
          urls.append(url(r'^{name}/$'.format(name=name), View.as_view(), name=name))
  
  urlpatterns = patterns('',
      url(r'^$', views.IndexView.as_view(), name="index"),
      url(r'^reset/$', views.ResetView.as_view()),
      url(r'^migration-guide/$', views.MigrationGuideView.as_view(), name="migration-guide"),
      url(r'^column-formats/$', views.ValidColumnFormatsView.as_view(), name="column-formats"),
      url(r'^javascript-initialization/$', views.JavascriptInitializationView.as_view(), name="js-init"),
      url(r'^satellite/$', views.SatelliteDatatableView.as_view(), name="satellite"),
      *urls
  )
  
subject: Remove unused import