The Shape They All Share

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

Domain

Python

Difficulty

medium

Seniority

mid

Problem

A nightly job loads dozens of regional CSV exports into memory as `tables`, each one a list of row dicts. Over the years each region added its own extra columns, so the records no longer line up: combine every row into a single list, keeping only the fields present in every record across all tables and dropping the rest. With no records at all, the result is empty.

Summary

A pile of exports, no two quite alike. Keep only what every record agrees on.

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