Unverified50% confidenceFactExact time
Python 3.15 introduces the Sentinel type, allowing developers to define sentinel values with explicit names, such as MISSING = Sentinel("MISSING") and EMPTY = Sentinel("EMPTY").
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/14/2026
First Seen
Valid until: 1/12/2027
Sources
Related Entities
Related Claims
UnverifiedPython 3.15 has a built-in dedicated sentinel type that supports a readable string representation, preserves identity on copy, supports pickling at module scope, and can be used in type expressions.59% similarUnverifiedPython 标准库的 dataclasses 模块使用 MISSING 哨兵,functools.reduce 内部实现也使用类似的哨兵机制57% similarUnverified对于尚未升级到 Python 3.15 的项目,仍可使用经典的 object() 哨兵方案,其语义与官方实现一致57% similarUnverifiedPython 中常见的隐性全局状态包括模块级变量、类变量、环境变量、sys.path 修改、已注册的信号处理器及猴子补丁的模块属性55% similarUnverifiedThe Hindsight project is written in Python.52% similar
Cite This Claim
Stable URI
https://kongchang.com/claim/1031709API
curl https://kongchang.com/api/v1/knowledge/claims/1031709MCP
get_claim(id=1031709)