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These 7 Python libraries are useful even if you're not a developer

Every Python developer knows some or all of these libraries, because they’re stable, reliable, and excellent at what they do.
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[Part 2] Why is only Store Manager B on edge when the average sales are the same? Uncovering invisible risks with 'Standard Deviation'

"Store A and Store B both have the same average monthly sales of '200,000 yen per day.' Yet, the manager of Store A is always calm, while the manager of Store B is always on edge, chasing inventory ...