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Investigate bad data in a large clickstream export in a notebook

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PerplexityCodingLast asked Oct 2026

A coding interview question asked in Perplexity's coding round, last asked Oct 2026. It tests data analysis, pandas and data cleaning.

You work in a Jupyter notebook on your own machine, with an AI assistant allowed. First a short warm-up: sort names like item_2, item_10, item_1 so the number part compares as a number.

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data analysis · pandas · data cleaning

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