CODEWITHSUNDEEP
pythondictionary
myString
myString

Reputation: 11

Creating a dictionary from another two in Python

I have the following dictionaries:

movies = {"Fences": "Viola Davis", "Hick": "Blake Lively",
           "The Hunger Games": "Jennifer Lawrence"}

and

tvshows = {"How to Get Away with Murder": "Viola Davis",
            "Gossip Girl": "Blake Lively",
            "The Office": "Steve Carrell"}

and I want as a result of these two the next dictionary where if a value is repeated in movies and tvshows must appear as follows :

{"Viola Davis": ["Fences", "How to Get Away with Murder"],
   "Steve Carrell": ["The Office"], "Jennifer Lawrence":
   ["The Hunger Games"], "Blake Lively": ["Hick",
   "Gossip Girl"]}

My code until now is:

tv_movies = { actor : [ program for program, actor in tvshows.items() if actor == actor  ] for movie, actor in movies.items()  }

but I get the following output:

print(tv_movies)

{'Viola Davis': ['The Office', 'How to Get Away with Murder', 'Gossip Girl'], 'Jennifer Lawrence': ['The Office', 'How to Get Away with Murder', 'Gossip Girl'], 'Blake Lively': ['The Office', 'How to Get Away with Murder', 'Gossip Girl']}

I´m stuck here, can you help me please?. Thank you very much

Upvotes: 0

Views: 64

Answers (2)

Rajesh
Rajesh

Reputation: 179

ChainMap is supported from V3.3, so here is code that is compatible with python V2.x and 3.x

lis = [movies, tvshows] #make a list of dictionaries - movies, tvshows, etc..
d = {}
for element in lis:
    for key, value in element.items():
        if value not in d.keys():
            d[value] = [key]
        else:
            d[value].append(key)

Upvotes: 0

devforfu
devforfu

Reputation: 1612

Maybe something like this?

from collections import ChainMap, defaultdict
d = defaultdict(list)
for title, actor in ChainMap(movies, tvshows).items():
    d[actor].append(title)

Upvotes: 2

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