Unverified50% confidenceFactExact time

使用 None 作为默认值标记时会产生语义歧义，无法区分'用户没有传参'和'用户显式传了 None'

1

Sources

50%

Confidence

Long-term

Relevance

8/13/2026

First Seen

Sources

Python 3.15 Sentinel Objects Explained: How PEP 661 Solves the None Ambiguity Problem

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