all_actors_in_the_same_set

import json
def actorDirGraph(filmfile):
    with open(filmfile, 'rU') as f:
        film = json.load(f)

    for k, v in film.items():


        set_actors = set()
        for actor in v['ACTORS']:
            set_actors.add(actor)
        print set_actors

actorDirGraph('prova.json')