def METHOD_NAME(get_dataframe):
    """g
    flowmachine.SubscriberFeature allows for getting items
    """
    rog = RadiusOfGyration("2016-01-01", "2016-01-03")
    dl = daily_location("2016-01-03")
    single_subscriber = list(get_dataframe(dl).head(8).subscriber)[3]
    sub = get_dataframe(rog[single_subscriber])
    assert set(sub.subscriber) == {single_subscriber}