data_types.md

title	Key-Value Transformation in a Dictionary
tags	python functions

Problem Statement

Write a function reverse_dict(d: dict) -> dict that reverses the keys and values of a dictionary. Assume values are unique and hashable. Sample Input

{1: 'a', 2: 'b', 3: 'c'}

Sample Output

{'a': 1, 'b': 2, 'c': 3}

Solution

<prefix>
def reverse_dict(d: dict) -> dict:
    """
    Reverses the keys and values of the given dictionary.

    Arguments:
    d: dict - a dictionary where the values are unique and hashable.

    Returns:
    dict - a new dictionary with the keys and values reversed.
    """
</prefix>
<template>
    return <sol>{value: key for key, value in d.items()}</sol>
</template>

Public Test Cases

Input 1

{1: 'a', 2: 'b', 3: 'c'}

Output 1

{'a': 1, 'b': 2, 'c': 3}

Input 2

{'x': 10, 'y': 20, 'z': 30}

Output 2

{10: 'x', 20: 'y', 30: 'z'}

Input 3

{100: 'apple', 200: 'banana'}

Output 3

{'apple': 100, 'banana': 200}

Private Test Cases

Input 1

{'cat': 1, 'dog': 2, 'mouse': 3}

Output 1

{1: 'cat', 2: 'dog', 3: 'mouse'}