Reversing a dict with python

Question

I need to write a function that's these reverses the input.

Write a function reverse(dct) that takes as input a dict and returns a new dict where the keys and values have been flipped. You can assume the input dict has only string values.

What would be the code for this?

.>>> reverse({"boy": "ragazzo", "girl": "ragazza", "baby": "bambino"})

{'ragazzo': 'boy', 'ragazza': 'girl', 'bambino': 'baby'}


.>>> reverse({"boy": "niño", "girl": "niña", "baby": "bebe"})

{'niño': 'boy', 'niña': 'girl', 'bebe': 'baby'}

.>>> reverse({"boy": "garcon", "girl": "fille", "baby": "bébé"})

{'garcon': 'boy', 'fille': 'girl', 'bébé': 'baby'}

See [this answer](https://stackoverflow.com/a/1031878/12095613) on how to flip keys and values in a dictionary. — foureyes9408, Oct 31 '19 at 20:47
@foureyes9408 no, don't; see [this answer](https://stackoverflow.com/a/1087957/4799172) which is more idiomatic. There's nothing wrong with the top answer, but I don't see why they called `dict()` rather than use a dictionary comprehension that came with Python 3 — roganjosh, Oct 31 '19 at 21:06

score 1 · Answer 1 · answered Oct 31 '19 at 20:48

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reverse_dict = {value: key for key, value in dict.items()}

answered Oct 31 '19 at 20:48

Max Voisard

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score 0 · Answer 2 · answered Oct 31 '19 at 20:50

0

Map reversed to the dicts items:

def reverse(dct):
    return dict(map(reversed, dct.items()))

answered Oct 31 '19 at 20:50

Jab

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score 0 · Answer 3 · answered Oct 31 '19 at 20:50

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It gonna be like: (i use python 3.7)

def reverse(my_map):
    inv_map = {v: k for k, v in my_map.items()}
    return(inv_map)

answered Oct 31 '19 at 20:50

alexandrov

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Reversing a dict with python

3 Answers3