The Dictionary Inverter

A easy Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

easy

Seniority

L4

Problem

Given a dict d, return a new dict whose keys are the distinct values of d. Each key's value is a sorted list of original keys that had that value. Return the result as a dict; if the input values are integers they become string keys in the test harness (JSON convention).

Summary

Flip the dict. Group what used to be values.

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