switching keys and values in a dictionary in python [duplicate]

Answer 1

First of all it is not guaranteed that this is possible, since the values of a dictionary can be unhashable.

In case these are not, we can use a functional approach with:

reversed_dict = dict(map(reversed, original_dict.items()))

Answer 2

maybe:

flipped_dict = dict(zip(my_dict.values(), my_dict.keys()))

Answer 3

my_dict = { my_dict[k]:k for k in my_dict}

Answer 4

If values are not unique in the dictionary, then you can map keys to that value. Here an example of how to do it using defaultdict

from collections import defaultdict


def reverse_dict(data: dict) -> dict:
    rd = defaultdict(list)
    for k, v in data.items():
        rd[v].append(k)
    return rd


if __name__ == "__main__":
    from collections import Counter

    data = "aaa bbb ccc ffffd aaa bbb ccc aaa"
    c = Counter(data.split())
    print(c)
    # Counter({'aaa': 3, 'bbb': 2, 'ccc': 2, 'ffffd': 1})
    rd = reverse_dict(c)
    print(rd)
    # defaultdict(<class 'list'>, {3: ['aaa'], 2: ['bbb', 'ccc'], 1: ['ffffd']})