  
  
  class PermissionDenied(APIException):
      status_code = status.HTTP_403_FORBIDDEN
      default_detail = _("You do not have permission to perform this action.")
  
  
  class NotFound(APIException):
      status_code = status.HTTP_404_NOT_FOUND
      default_detail = _("Not found.")
 
</s> remove     default_detail = _("Authentication credentials were not provided.")
 </s> add     default_detail = _('Authentication credentials were not provided.') </s> remove     default_detail = _("Not found.")
 </s> add     default_detail = _('Not found.') </s> remove     default_detail = _("Incorrect authentication credentials.")
 </s> add     default_detail = _('Incorrect authentication credentials.') </s> remove     default_detail = _("Malformed request.")
 </s> add     default_detail = _('Malformed request.') </s> remove     default_detail = _("Method \"{method}\" not allowed.")
 </s> add     default_detail = _('Method "{method}" not allowed.')
    default_detail = _('You do not have permission to perform this action.')
  
  
  class PermissionDenied(APIException):
      status_code = status.HTTP_403_FORBIDDEN
    default_detail = _('You do not have permission to perform this action.')
  
  
  class NotFound(APIException):
      status_code = status.HTTP_404_NOT_FOUND
      default_detail = _("Not found.")
keep keep keep keep replace keep keep keep keep keep
 prefer single quotes in source and double quotes in user visible strings; add some missing full stops to user visible strings 
rest_framework/exceptions.py