Challenge 156 - Invert Keys & Values

challenge_156.md

Challenge 156 - Invert Keys & Values

Write a function that inverts the keys and values of a dictionary.

Examples

invert({ "z": "q", "w": "f" })
➞ { "q": "z", "f": "w" }

invert({ "a": 1, "b": 2, "c": 3 })
➞ { 1: "a", 2: "b", 3: "c" }

invert({ "zebra": "koala", "horse": "camel" })
➞ { "koala": "zebra", "camel": "horse" }

challenge_tests.py

from __future__ import annotations
from typing import Union
import unittest


def invert(dictionary: dict[str, Union[str, int]]) -> dict[Union[str, int], str]:
    return {}  # Put your code here!!!


class Test(unittest.TestCase):
    def test_1(self):
        self.assertEqual(invert({"a": 1, "b": 2, "c": 3}), {1: "a", 2: "b", 3: "c"})

    def test_2(self):
        self.assertEqual(invert({"z": "q", "w": "f"}), {"q": "z", "f": "w"})

    def test_3(self):
        self.assertEqual(invert({"zebra": "koala", "horse": "camel"}), {"koala": "zebra", "camel": "horse"})


if __name__ == "__main__":
    unittest.main()

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