The Gap Filler

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 list that may contain None values, return a list of the same length where each None is replaced by the most recent prior non-None value. If None appears before any non-None value, leave it as None.

Summary

Fill the Nones with the last real value.

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