Swap_items_in_a_dictionary.md

CodeWars Python Solutions

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Swap items in a dictionary

In this kata, you will take the keys and values of a dictionary and swap them around.

You will be given a dictionary, and then you will want to return a dictionary with the old values as the keys, and list the old keys as values under their original keys.

For example, given the dictionary: {'Ice': 'Cream', 'Age': '21', 'Light': 'Cream', 'Double': 'Cream'},

you should return: {'Cream': ['Ice', 'Double', 'Light'], '21': ['Age']}

Notes:

• The dictionary given will only contain strings
• The dictionary given will not be empty
• You do not have to sort the items in the lists

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Given Code

def switch_dict(dic):
    pass

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Solution

def switch_dict(dic):
    new = {}
    for k,v in dic.items():
        if v in new:
            new[v] = new[v] + [k]
        else:
            new[v] = [k]
    return new

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