old_contents: from django.conf.urls import url
  
  from views import login, logout, signup
  
  
  urlpatterns = [
      url(r'^login', login),
      url(r'^logout', logout),
      url(r'^signup', signup),
  ]
  
new_contents: from django.conf.urls import url
  
  from views import login, logout, signup, confirm_email
  
  
  urlpatterns = [
      url(r'^login', login),
      url(r'^logout', logout),
      url(r'^signup', signup),
      url(r'^confirm_email/(?P<key>\w+)', confirm_email),
  ]
  
subject: Add an endpoint for email confirmation