Deep Flatten

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

Domain

Python

Difficulty

medium

Seniority

L4

Problem

Given a list that may contain other lists nested to arbitrary depth, return a single flat list of all leaf values in left-to-right order. Non-list values are leaves; strings are leaves (do not iterate into them).

Summary

Nested deep. Flatten everything.

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