Coalesce Fields

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

Domain

Python

Difficulty

easy

Problem

Our config loader uses a two-layer override pattern: a primary dict where some values may be None, and a defaults dict with fallbacks. Return a merged dict where any None in the primary is replaced by the corresponding value from defaults. Keys present only in defaults should also be included.

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