The Slow Leak

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

Domain

Python

Difficulty

medium

Seniority

L3

Problem

A metrics rollup arrives in `nested`: a list where each element is either a leaf reading or another sub-group, with sub-groups nested to arbitrary depth. Return one flat list of every reading in left-to-right order. Treat a string as a single reading that stays intact rather than splitting into characters, and let an empty sub-group contribute nothing.

Summary

Nested groups. One flat stream.

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