Word Frequency Analyzer
easyMulti-file Python Guided available
Build a small two-module text-analytics package, a tokenizer and a top-N word counter, and make the real pytest suite pass.
Choose how you want to solve it
Both modes open the same in-browser IDE with the AI pair programmer and the real test suite.
Recommended
Guided Walkthrough
A phase-by-phase interview simulation with instant feedback on your reasoning.
- Explain decisions by voice or text
- Focused, phase-scoped test runs
- Progressive hints when stuck
- Full solution walkthrough at the end
Sandbox
The open coding view. No phases, just you and the codebase.
- Full instructions up front
- Free-form AI pair-programmer
- Run the entire test suite anytime