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The Column Transformer

A easy Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
Python
Difficulty
easy
Seniority
junior, mid

Interview Prompt

Our data cleaning layer applies user-defined transformations to tabular data. Write a function called apply_transforms that takes a list of row dictionaries and a transforms dictionary mapping column names to functions. Apply each transform function to the corresponding column in every row. Return the modified rows. Columns not in transforms should be left unchanged.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your python solution with real code execution
  4. Get instant feedback and a hire/no-hire decision