The Lazy Stream

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

Domain

Python

Difficulty

hard

Seniority

L5

Problem

An upstream export arrives as a `data` list where some slots hold a lone value and others hold a short list of values that got batched together during ingestion. Return a flat list that splices each batched list's contents into its place, leaving everything else exactly as it sits (strings stay whole even though they iterate, and anything nested deeper than one level is left as-is).

Summary

Some slots hold one value, some hold a batch. Level them out.

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