3ad378c1dc
Change dsh-sdd перенесён в openspec/changes/archive/2026-10-24-dsh-sdd, дельта dsh-sdd добавлена в openspec/specs/dsh-sdd/spec.md (7 требований). Co-Authored-By: DeepSeek Harness <noreply@deepseek.com>
21 lines
520 B
Markdown
21 lines
520 B
Markdown
# Spec: stats
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Module `src/stats.py`. Plain functions over a list of numbers. No third-party
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dependencies; Python 3.8+ stdlib only.
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## mean(values)
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Returns the arithmetic mean as `float`. Raises `ValueError("empty")` on an
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empty list.
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## median(values)
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Returns the median as `float` and does not mutate `values`.
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- Odd length: the middle element.
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- Even length: the mean of the two middle elements.
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- Empty list: `ValueError("empty")`.
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## describe(values)
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Returns `{"count": int, "mean": float, "median": float}`.
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