Python 3.9 is now generally available.

google.appengine.api.yaml_errors.EventListenerError

Top level exception raised by the YAML listener.

Inherits From: Error, expected_type

Any exception raised within the process of parsing a YAML file from an EventListener is caught and wrapped in an EventListenerError. The causing exception is maintained, but additional useful information is saved which can be used for reporting useful information to users.

cause The original exception which caused the EventListenerError.