old_contents: from django.conf.urls import url
  from . import views
  
  urlpatterns = (
      url(r'^$', views.open_image, name='open_image'),
      url(r'^detect$', views.detect_and_select, name='detect_and_select'),
      url(r'^annotate$', views.annotate_and_segment, name='annotate_and_segment'),
      url(r'^report$', views.report_and_export, name='report_and_export'),
  
  )
  
new_contents: from django.conf.urls import url
  from . import views
  
  urlpatterns = (
      url(r'^$', views.open_image, name='open_image'),
      url(r'^detect$', views.detect_and_select, name='detect_and_select'),
      url(r'^annotate$', views.annotate_and_segment, name='annotate_and_segment'),
      url(r'^report$', views.report_and_export, name='report_and_export'),
  )
  
subject: Remove excess whitespace