Python 3.x - 以多个元组为键的映射字典

Question

I have a dictionary containing multiple tuple as keys:

dictionary = {('Paris', 'Monaco', 'Marseille'): 'France',
               ('Milan', 'Juventus', 'Roma'): 'Italy',
               ('Manchester', 'Liverpool', 'London'): 'England'}

How to mapping list with lot of city names to the dictionary above:

lst = ['Paris','Paris','Monaco','Milan','London',...]

I have tried this:

countries = []
for k,v in dictionary.items():
    for each in lst:
        if each in k:
            countries.append(v)

Results: It wasnt assign the city dictionary one-by-one instead listing all keys multiple times

Desired output:

lst        countries
Paris       France
Paris       France
Monaco      France
Milan       Italy
London      England
...         ...

Any ideas?

Answer 1

I suggest you flatten the dictionary keys. Duplicating values across keys isn't an issue:

dictionary = {k: v for tup, v in dictionary.items() for k in tup}

Then use the new dictionary to easily build your list:

countries = [dictionary[city] for city in lst]

You can match city and country side by side like so:

for city, country in zip(lst, countries):
    print(city, country)

Or without building the new countries list, you can use the new dictionary directly:

for city in lst:
    print(city, dictionary[city])