Why These 50?
Hand-curated for maximum interview ROI.
A Pandas Curriculum, Not Random Tutorials
Five stages of ten problems, each adding exactly one new pandas pattern. From read_csv to multi-frame merges to rolling aggregations — every step builds on the last, no tutorial-jumping.
Industry-Grade Multi-Table Data
Every problem runs on the same kind of 8–15 table production schemas pandas pipelines actually hit — payments, lodging, streaming, social. You write the shape of code a real DS or analytics engineer writes.
Full Scientific Stack in Your Browser
pandas, numpy, scipy, sklearn — all run in your browser via Pyodide. No install, no Conda, no virtualenv. Hit Run and a t-test or a linear regression fits in under a second.
Skill Coverage
How the 50 problems distribute across pandas topics.
FAQ
The first 10 problems (Stage 1) are completely free.
Stages 2-5 require a Premium subscription, which gives you access to all 1,625 problems across 15 production-grade datasets.
Ready to Master Pandas?
Start with Stage 1 — graded instantly in your browser.
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