Unverified50% confidenceFactExact time
PEP 661 标准哨兵对象提供清晰的 repr 输出（如 <MISSING>），支持正确的 pickle 往返序列化，并可被类型检查器特殊识别
1
Sources
50%
Confidence
Long-term
Relevance
8/13/2026
First Seen
Sources
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