'Retrieves all items from one or more lists.
**Usage Example**::
feed_counters = ListsStorage(\'user:5\')
unseen_items, unread_items = feed_counters.get(\'unseen\', \'unread\')
unseen_items = feed_counters.get(\'unseen\')
unread_items = feed_counters.get(\'unread\')
: args define which lists\' items to be retrieved'

def get(self, *args):

    raise NotImplementedError()
