old_contents: from model_utils import Choices
  
  LOCATION_STATUS = Choices('active', 'review')
  OBSERVATION_STATUS = Choices(
      'active', 'draft', 'pending', 'deleted'
  )
  COMMENT_STATUS = Choices('active', 'deleted')
  
  ACCEPTED_IMAGE_FORMATS = ('.png', '.jpeg', '.jpg', '.gif')
  ACCEPTED_VIDEO_FORMATS = ('.mov', '.mpeg4', '.avi', '.wmv', '.flv', '.3gpp',
                            '.webm', '.mp4')
  
new_contents: from model_utils import Choices
  
  LOCATION_STATUS = Choices('active', 'review')
  OBSERVATION_STATUS = Choices(
      'active', 'draft', 'pending', 'deleted'
  )
  COMMENT_STATUS = Choices('active', 'deleted')
  
  ACCEPTED_IMAGE_FORMATS = ('.png', '.jpeg', '.jpg', '.gif')
  ACCEPTED_VIDEO_FORMATS = ('.mov', '.mpeg4', '.avi', '.wmv', '.flv', '.3gpp',
                            '.webm', '.mp4', '.mpegps')
  
subject: Update base.py