'Subclasses can override this to add custom entity conversion code.
This is called for each entity, after its properties are populated from
CSV but before it is stored. Subclasses can override this to add custom
entity handling code.
The entity to be inserted should be returned. If multiple entities should
be inserted, return a list of entities. If no entities should be inserted,
return None or [].
Args:
entity: datastore.Entity
Returns:
datastore.Entity or list of datastore.Entity'

def HandleEntity(self, entity):

    return entity
