Stars.py

def stars(movies,tvshows):
    Newdict = {}
    for keys,values in movies.items():
        for items in values:
            if items not in Newdict:
                Newdict[items]=[keys]
            else:
                Newdict[items]+=[keys]
    
    for keys,values in tvshows.items():
        for items in values:
            if items not in Newdict:
                Newdict[items]=[keys]
            else:
                Newdict[items]+=[keys]
    for key,values  in Newdict.items():
        values = values.sort()

    return Newdict

#print (although the order of the keys may vary):
#
#{'Portia de Rossi': ['Arrested Development'], 'Will Ferrell': ['The Lego Movie'], 'Yvette Brown': ['Community'], 'Rebel Wilson': ['How to Be Single'], 'Danny Pudi': ['Community'], 'Elizabeth Banks': ['30 Rock', 'The Lego Movie'], 'Alec Baldwin': ['30 Rock'], 'Alison Brie': ['Community', 'How to Be Single', 'The Lego Movie'], 'Tina Fey': ['30 Rock'], 'Dakota Johnson': ['How to Be Single'], 'Joel McHale': ['Community'], 'Jack McBrayer': ['30 Rock'], 'Tracy Morgan': ['30 Rock'], 'Donald Glover': ['Community'], 'Will Arnett': ['Arrested Development', 'The Lego Movie'], 'Jason Bateman': ['Arrested Development']}

movies = {"How to Be Single": ["Alison Brie", "Dakota Johnson",
                               "Rebel Wilson"],
          "The Lego Movie": ["Will Arnett", "Elizabeth Banks",
                             "Alison Brie", "Will Ferrell"]}
tvshows = {"Community": ["Alison Brie", "Joel McHale",
                         "Danny Pudi", "Yvette Brown",
                         "Donald Glover"],
           "30 Rock": ["Tina Fey", "Tracy Morgan", "Jack McBrayer",
                       "Alec Baldwin", "Elizabeth Banks"],
           "Arrested Development": ["Jason Bateman", "Will Arnett",
                                    "Portia de Rossi"]}
print(stars(movies, tvshows))