feat: PLANNING体系首版（00路线图/02任务总表/03执行协议/I-03/I-04/registry42口径）+M1止血交付

2026-09-12 14:25:25 +08:00
commit 39af400fc8
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+"""统计工具 —— dim4 Q4.2 自检产物。"""
+
+from __future__ import annotations
+
+
+def mean(values: list[float]) -> float:
+    if not values:
+        return 0.0
+    return sum(values) / len(values)
+
+
+def median(values: list[float]) -> float:
+    if not values:
+        return 0.0
+    s = sorted(values)
+    n = len(s)
+    mid = n // 2
+    if n % 2:
+        return s[mid]
+    return (s[mid - 1] + s[mid]) / 2
+
+
+if __name__ == "__main__":
+    assert mean([]) == 0.0
+    assert mean([1, 2, 3]) == 2.0
+    print("M-OK")
+    assert median([]) == 0.0
+    assert median([1, 3]) == 2.0
+    assert median([1, 2, 3, 4]) == 2.5
+    print("MD-OK")
+    print("all stats self-tests passed")