Moving Day

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

Domain

Python

Difficulty

hard

Seniority

L5

Problem

A schema migration is an ordered list of operations run against every stored record: `rename` a field, `add` one with a default, `remove` one, or `cast` a field to `int`, `float`, or `str`. A field's `path` is dot-separated so an operation can reach into a nested record like `addr.country`, and `add` builds any intermediate records that are missing while `rename`, `remove`, and `cast` skip a path that isn't there. Casting is lenient: a value that will not convert, such as `None`, is left as it is.

Summary

Old schema in, new schema out.

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