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Pandas

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Advanced

Data leakage: the kinds that survive your train/test split

Splitting correctly stops the obvious leak. Target encoding, feature stores, label windows and proxy features leak anyway — how to find each.

Machine Learning Python Pandas

10 min readAug 29, 2026vaibhavkothari

Intermediate

Clean a messy CSV with pandas before you train anything

Ten pandas fixes for the problems every real dataset has: broken headers, duplicate rows, mixed types, silly outliers and inconsistent categories.

Python Pandas Machine Learning

6 min readAug 26, 2026vaibhavkothari

Beginner

ValueError: could not convert string to float — fix your data, not your code

This error means one cell in your data is not a number. Learn how to find the exact bad row in pandas and clean commas, currency symbols, percent signs and blanks for good.

Python Pandas Machine Learning

6 min readAug 26, 2026vaibhavkothari