Coalesce Fields

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

Domain

Python

Difficulty

easy

Seniority

L3

Problem

Given primary and defaults dicts, return a merged dict where every key in primary is kept, but if primary[key] is None it is replaced by defaults[key] (if the key exists in defaults). Keys only in defaults are NOT added.

Summary

Nulls are hiding. Fill them in.

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