The Shadow Cleaner

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 a list, return a new list with duplicates removed, preserving first-occurrence order. Do NOT use set(), dict.fromkeys(), or similar built-in dedup helpers.

Summary

Remove the repeats. No shortcuts.

Practice This Problem

Solve this Python problem with real code execution. DataDriven runs your Python code in a real environment and grades it automatically.