How to use the eventsourcing.application.policies.PersistencePolicy function in eventsourcing

def construct_entity_persistence_policy(self):
        if self.entity_event_store:
            return PersistencePolicy(
                event_store=self.entity_event_store,
                event_type=VersionedEntity.Event,
            )

def construct_persistence_policy(self) -> None:
        self._persistence_policy = PersistencePolicy(
            event_store=self.event_store, persist_event_type=self.persist_event_type
        )

def construct_snapshot_persistence_policy(self):
        if self.snapshot_event_store:
            return PersistencePolicy(
                event_store=self.snapshot_event_store,
                event_type=Snapshot,
            )

def construct_log_persistence_policy(self):
        if self.log_event_store:
            return PersistencePolicy(
                event_store=self.log_event_store,
                event_type=Logged,
            )

def construct_snapshot_persistence_policy(self):
        if self.snapshot_event_store:
            return PersistencePolicy(
                event_store=self.snapshot_event_store, persist_event_type=Snapshot
            )

def construct_entity_persistence_policy(self):
        if self.entity_event_store:
            return PersistencePolicy(
                event_store=self.entity_event_store,
                persist_event_type=VersionedEntity.Event,
            )