old_contents: """
  Signal handler for invalidating cached course overviews
  """
  from django.contrib.auth.models import User
  from django.dispatch.dispatcher import receiver
  
  from .models import CourseOverview
  from .connector import EdevateDbConnector
  from xmodule.modulestore.django import SignalHandler
  
  
  @receiver(SignalHandler.course_published)
  def _listen_for_course_publish(sender, course_key, **kwargs):  # pylint: disable=unused-argument
      """
      Catches the signal that a course has been published in Studio and
      updates the corresponding CourseOverview cache entry.
      """
      CourseOverview.objects.filter(id=course_key).delete()
      CourseOverview.load_from_module_store(course_key)
  
  
  @receiver(SignalHandler.course_deleted)
  def _listen_for_course_delete(sender, course_key, **kwargs):  # pylint: disable=unused-argument
      """
      Catches the signal that a course has been deleted from Studio and
      invalidates the corresponding CourseOverview cache entry if one exists.
      """
      CourseOverview.objects.filter(id=course_key).delete()
      # import CourseAboutSearchIndexer inline due to cyclic import
      from cms.djangoapps.contentstore.courseware_index import CourseAboutSearchIndexer
      # Delete course entry from Course About Search_index
      CourseAboutSearchIndexer.remove_deleted_items(course_key)
  
  
  @receiver(SignalHandler.course_published)
  def _create_edevate_course_for_verification(sender, course_key, **kwargs):  # pylint: disable=unused-argument
      """
      Catches the signal that a course has been published in Studio and
      create course on the edevate for verification.
      """
      try:
          course = modulestore().get_course(course_key)
          course_author = User.objects.get(pk=course.published_by)
          edevate_db = EdevateDbConnector()
          edevate_db.update_or_create_verification_course(course_key,
                                                          course_author.email)
          edevate_db.close()
      except User.DoseNotExist:
          pass
  
new_contents: """
  Signal handler for invalidating cached course overviews
  """
  from django.contrib.auth.models import User
  from django.dispatch.dispatcher import receiver
  
  from .models import CourseOverview
  from .connector import EdevateDbConnector
  from xmodule.modulestore.django import SignalHandler, modulestore
  
  
  @receiver(SignalHandler.course_published)
  def _listen_for_course_publish(sender, course_key, **kwargs):  # pylint: disable=unused-argument
      """
      Catches the signal that a course has been published in Studio and
      updates the corresponding CourseOverview cache entry.
      """
      CourseOverview.objects.filter(id=course_key).delete()
      CourseOverview.load_from_module_store(course_key)
  
  
  @receiver(SignalHandler.course_deleted)
  def _listen_for_course_delete(sender, course_key, **kwargs):  # pylint: disable=unused-argument
      """
      Catches the signal that a course has been deleted from Studio and
      invalidates the corresponding CourseOverview cache entry if one exists.
      """
      CourseOverview.objects.filter(id=course_key).delete()
      # import CourseAboutSearchIndexer inline due to cyclic import
      from cms.djangoapps.contentstore.courseware_index import CourseAboutSearchIndexer
      # Delete course entry from Course About Search_index
      CourseAboutSearchIndexer.remove_deleted_items(course_key)
  
  
  @receiver(SignalHandler.course_published)
  def _create_edevate_course_for_verification(sender, course_key, **kwargs):  # pylint: disable=unused-argument
      """
      Catches the signal that a course has been published in Studio and
      create course on the edevate for verification.
      """
      try:
          course = modulestore().get_course(course_key)
          course_author = User.objects.get(pk=course.published_by)
          edevate_db = EdevateDbConnector()
          edevate_db.update_or_create_verification_course(course_key,
                                                          course_author.email)
          edevate_db.close()
      except User.DoesNotExist:
          pass
  
subject: fix typo, add missed import