Used by Variable/Connection.

https://github.com/apache/airflow/blob/894741e311ffd642e036b80d3b1b5d53c3747cad/airflow/secrets/metastore.py#L32

"""Decode a previously serialized Pendulum Timezone."""
    return pendulum.tz.timezone(var)
def _get_registered_timetable(importable_string: str) -> type[Timetable] | None:
    from airflow import plugins_manager
    if importable_string.startswith("airflow.timetables."):
        return import_string(importable_string)
    plugins_manager.initialize_timetables_plugins()
    if plugins_manager.timetable_classes:
        return plugins_manager.timetable_classes.get(importable_string)
    else:
        return None
class _TimetableNotRegistered(ValueError):