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

Domain

Python

Difficulty

medium

Seniority

L5

Problem

A permission service replays a stream of access changes: `grant` and `revoke` add or drop a single permission for one user, `check` asks whether a user currently holds a given permission, and `update_config` hands over a whole user-to-permissions mapping that replaces every permission on record. Most operations name an action, a user, and a permission, but `update_config` carries only the action and the mapping. Return the boolean answer to each `check` in order, and treat a user you have never seen as holding nothing.

Summary

When the roster changes, does access follow?

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